question_answer 1)
In the case of alkali metals, the covalent character decreases in the order:
A)
\[MF>MCl>MBr>MI\] done
clear
B)
\[MF>MCl>MI>MBr\] done
clear
C)
\[MI>MBr>MCl>MF\] done
clear
D)
\[MCl>MI>MBr>MF\] done
clear
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question_answer 2)
The mobility of metal ions in aqueous medium \[(L{{i}^{+}},N{{a}^{+}},{{K}^{+}},R{{b}^{+}})\] in the electric field, follows the order
A)
\[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\] done
clear
B)
\[R{{b}^{+}}>N{{a}^{+}}={{K}^{+}}>L{{i}^{+}}\] done
clear
C)
\[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}\] done
clear
D)
\[N{{a}^{+}}={{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\] done
clear
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question_answer 3)
The main oxides formed on combustion of \[Li,\text{ }Na\] and K in excess of air are, respectively:
A)
\[L{{i}_{2}}{{O}_{2}},N{{a}_{2}}{{O}_{2}}\] and \[K{{O}_{2}}\] done
clear
B)
\[L{{i}_{2}}O,N{{a}_{2}}{{O}_{2}}\]and \[K{{O}_{2}}\] done
clear
C)
\[L{{i}_{2}}O,N{{a}_{2}}O\] and \[K{{O}_{2}}\] done
clear
D)
\[Li{{O}_{2}},N{{a}_{2}}{{O}_{2}}\]and \[{{K}_{2}}O\] done
clear
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question_answer 4)
Which of the following oxides of potassium is not known?
A)
\[{{K}_{2}}O\] done
clear
B)
\[{{K}_{2}}{{O}_{4}}\] done
clear
C)
\[K{{O}_{3}}\] done
clear
D)
\[{{K}_{2}}{{O}_{3}}\] done
clear
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question_answer 5)
Nitrogen dioxide cannot be prepared by heating
A)
\[KN{{O}_{3}}\] done
clear
B)
\[Pb{{(N{{O}_{3}})}_{2}}\] done
clear
C)
\[Cu{{(N{{O}_{3}})}_{2}}\] done
clear
D)
\[AgN{{O}_{3}}\] done
clear
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question_answer 6)
Incorrect statement is:
A)
\[NaHC{{O}_{3}}\] and \[KHC{{O}_{3}}\] have same crystal structure done
clear
B)
On heating \[LiN{{O}_{3}}\] decomposes into \[L{{i}_{2}}O\] and \[N{{O}_{2}}\] done
clear
C)
Among alkali metals, \[Li\] metal impart red colour to flame done
clear
D)
\[L{{i}_{2}}S{{O}_{4}}\] does not form alum done
clear
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question_answer 7)
Which is not correctly matched
(i) Basic strength \[C{{s}_{2}}O<R{{b}_{2}}O<{{K}_{2}}O<N{{a}_{2}}O<L{{i}_{2}}O\] of oxides.
(ii) Stability of \[N{{a}_{2}}{{O}_{2}}<{{K}_{2}}{{O}_{2}}<R{{b}_{2}}{{O}_{2}}<C{{s}_{2}}{{O}_{2}}\] peroxides.
(iii) Stability of \[LiHC{{O}_{3}}<NaHC{{O}_{3}}<KHC{{O}_{3}}\] \[<RbHC{{O}_{3}}<CsHC{{O}_{3}}.\]
(iv) Melting point \[NaF<NaCl<NaBr<NaI\]
A)
(i) and (iv) done
clear
B)
(i) and (iii) done
clear
C)
(i) and (ii) done
clear
D)
(ii) and (iii) done
clear
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question_answer 8)
The solubility order for alkali metal fluoride in water is:
A)
\[LiF<RbF<KF<NaF\] done
clear
B)
\[RbF<KF<NaF<LiF\] done
clear
C)
\[LiF>NaF>KF>RbF\] done
clear
D)
\[LiF<NaF<KF<RbF\] done
clear
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question_answer 9)
Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point?
A)
\[NaCl\] done
clear
B)
\[KCl\] done
clear
C)
\[LiCl\] done
clear
D)
\[RbCl\] done
clear
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question_answer 10)
In crystals which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?
A)
\[LiF\] done
clear
B)
\[CsF\] done
clear
C)
\[CsI\] done
clear
D)
\[LiI\] done
clear
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question_answer 11)
Which of the following statements about\[N{{a}_{2}}{{O}_{2}}\], is not correct?
A)
It is diamagnetic in nature done
clear
B)
It is derivative of \[{{H}_{2}}{{O}_{2}}\] done
clear
C)
\[N{{a}_{2}}{{O}_{2}}\] oxidises \[C{{r}^{3+}}\] to \[CrO_{4}^{2-}\]in acid medium. done
clear
D)
It is the super oxide of sodium done
clear
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question_answer 12)
The correct order of thermal stability of hydroxides is:
A)
\[Ba{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Mg{{(OH)}_{2}}\] done
clear
B)
\[Mg{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Ba{{(OH)}_{2}}\] done
clear
C)
\[Mg{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ba{{(OH)}_{2}}\] done
clear
D)
\[Ba{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Mg{{(OH)}_{2}}\] done
clear
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question_answer 13)
The reducing power of a metal depends on various factors. Suggest the factor which makes \[Li\] metal the strongest reducing agent in aqueous solution:
A)
Sublimation enthalpy done
clear
B)
Ionisation enthalpy done
clear
C)
Hydration enthalpy done
clear
D)
Electron-gain enthalpy done
clear
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question_answer 14)
Select the correct statements :
I. \[C{{s}^{+}}\] is more highly hydrated than the other alkali metal ions
II. Among the alkali metals \[Li,\text{ }Na,\text{ }K\] and \[Rb,\] lithium has the highest melting point
III. Among the alkali metals, only lithium forms a stable nitride by direct combination with nitrogen
A)
I, II and III done
clear
B)
I and II done
clear
C)
I and III done
clear
D)
II and III done
clear
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question_answer 15)
In the following sequence of reaction, identify the compounds (A), (B) (C) and (D): \[\underset{Solution}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,\xrightarrow{S{{O}_{2}}}(A)\xrightarrow{N{{a}_{2}}C{{O}_{3}}}\] \[(B)\xrightarrow[Heat]{S}(C)\xrightarrow{AgN{{O}_{3}}}(D)\]
A)
\[N{{a}_{2}}S{{O}_{3}},NaHS{{O}_{3}},N{{a}_{2}}S,A{{g}_{2}}S\] done
clear
B)
\[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},A{{g}_{2}}S\] done
clear
C)
\[NaHS{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}S,A{{g}_{2}}O\] done
clear
D)
\[N{{a}_{2}}S{{O}_{3}},N{{a}_{2}}S{{O}_{4}},N{{a}_{2}}{{S}_{2}}{{O}_{3}},Ag\] done
clear
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question_answer 16)
Which of the following does not illustrate the anomalous properties of lithium?
A)
The melting point and boiling point of\[~Li\] are comparatively high done
clear
B)
\[~Li\] is much softer than the other group I metals done
clear
C)
\[~Li\] forms a nitride \[~L{{i}_{3}}N\] unlike group I metals done
clear
D)
The ion of \[~Li\] and its compounds are more heavily hydrated than those of the rest of the group done
clear
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question_answer 17)
The order solubility in water of alkaline earth metal sulphates down the group is \[Be>Mg>Ca>Sr>Ba\]. This is due to increases in
A)
ionization energy done
clear
B)
melting point done
clear
C)
coordination number done
clear
D)
All of these done
clear
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question_answer 18)
A chloride dissolves appreciably in cold water. When placed on a Pt wire in bunsen flame, no distinctive colour is noted. Which cation could be present?
A)
\[B{{e}^{2+}}\] done
clear
B)
\[B{{a}^{2+}}\] done
clear
C)
\[P{{b}^{2+}}\] done
clear
D)
\[C{{a}^{2+}}\] done
clear
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question_answer 19)
An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions :
(a) It gives a white turbidity with dilute \[HCl\] solution (b) It decolourises a solution of iodine in potassium iodide (c) It gives a white precipitate with silver nitrate solution which turns black on standing.
Identify the compound (X)
A)
\[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\] done
clear
B)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O\] done
clear
C)
\[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\] done
clear
D)
None of these done
clear
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question_answer 20)
A metal M readily forms its sulphate \[MS{{O}_{4}}\] which is water-soluble. It forms its oxide MO which becomes inert on heating. It forms an insoluble hyroxide \[M{{(OH)}_{2}}\], which is soluble in \[NaOH\] solution. Then M is
A)
\[Mg\] done
clear
B)
\[Ba\] done
clear
C)
\[Ca\] done
clear
D)
\[Be\] done
clear
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question_answer 21)
Melting point of calcium halides decreases in the order
A)
\[Ca{{F}_{2}}>CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}\] done
clear
B)
\[Ca{{I}_{2}}>CaB{{r}_{2}}>CaC{{l}_{2}}>Ca{{F}_{2}}\] done
clear
C)
\[CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}>CaC{{l}_{2}}\] done
clear
D)
\[CaC{{l}_{2}}>CaB{{r}_{2}}>Ca{{I}_{2}}>Ca{{F}_{2}}\] done
clear
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question_answer 22)
Which of the following is not correct?
A)
\[2L{{i}_{2}}O\xrightarrow[673K]{heat}L{{i}_{2}}{{O}_{2}}+2Li\] done
clear
B)
\[2{{K}_{2}}O\xrightarrow[673K]{heat}{{K}_{2}}{{O}_{2}}+2K\] done
clear
C)
\[2N{{a}_{2}}O\xrightarrow[673K]{heat}N{{a}_{2}}{{O}_{2}}+2Na\] done
clear
D)
\[2R{{b}_{2}}O\xrightarrow[673K]{heat}R{{b}_{2}}{{O}_{2}}+2Rb\] done
clear
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question_answer 23)
The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
A)
\[CsH>RbH>KH>NaH>LiH\] done
clear
B)
\[KH>NaH>LiH>CsH>RbH\] done
clear
C)
\[NaH>LiH>KH>RbH>CsH\] done
clear
D)
\[LiH>NaH>KH>RbH>CsH\] done
clear
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question_answer 24)
Which of the following is not correct about the solution when moderate amount of sodium metal is dissolved in liquid ammonia at low temperature'?
A)
\[N{{a}^{+}}\] ions are produced in solution done
clear
B)
We get a blue coloured solution done
clear
C)
the solution acts as a good conductor of electricity done
clear
D)
Liquid ammonia remains diamagnetic done
clear
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question_answer 25)
The order of solubility of lithium halides in nonpolar solvents follows the order
A)
\[LiI>LiBr>LiCl>LiF\] done
clear
B)
\[LiF>LiI>LiBr>LiCl\] done
clear
C)
\[LiCl>LiF>LiI>LiBr\] done
clear
D)
\[LiBr>LiCl>LiF>LiI\] done
clear
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question_answer 26)
Which of the following is most stable?
A)
\[N{{a}_{3}}N\] done
clear
B)
\[L{{i}_{3}}N\] done
clear
C)
\[{{K}_{3}}N\] done
clear
D)
\[R{{b}_{3}}N\] done
clear
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question_answer 27)
\[ZnC{{l}_{2}}+NaHC{{O}_{3}}\xrightarrow{Heat}(A)\xrightarrow{Heat}\] \[(B)+(C){{H}_{2}}O(B)+NaOH\to (D)\] Identify the compound (D) present in the solution.
A)
\[ZnC{{O}_{3}}\] done
clear
B)
\[Zn{{(OH)}_{2}}\] done
clear
C)
\[ZnO\] done
clear
D)
\[N{{a}_{2}}Zn{{O}_{2}}\] done
clear
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question_answer 28)
Which of the following has correct increasing basic strength?
A)
\[MgO<BeO<CaO<BaO\] done
clear
B)
\[BeO<MgO<CaO<BaO\] done
clear
C)
\[BaO<CaO<MgO<BeO\] done
clear
D)
\[CaO<BaO<BeO<MgO\] done
clear
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question_answer 29)
Which of the following statement is false?
A)
Strontium decomposes water readily than beryllium. done
clear
B)
Barium carbonate melts at a higher temperature than calcium carbonate. done
clear
C)
Barium hydroxide is more soluble in water than magnesium hydroxide. done
clear
D)
Beryllium hydroxide is more basic than barium hydroxide. done
clear
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question_answer 30)
Which of the following is the best method for preparation of \[Be{{F}_{2}}\]?
A)
Reaction of \[Be\] with \[{{F}_{2}}\] done
clear
B)
Thermal decomposition of \[{{(N{{H}_{4}})}_{2}}Be{{F}_{4}}\] done
clear
C)
Reaction of \[Be\] with \[HF\] done
clear
D)
All of the above are equally effective done
clear
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question_answer 31)
Aqueous solution of a group 2 element is precipitated by adding \[N{{a}_{2}}C{{O}_{3}},\] then this precipitate is tested on flame, no light in visible region is observed , this element can be
A)
\[Ba\] done
clear
B)
\[Mg\] done
clear
C)
\[Ca\] done
clear
D)
\[Sr\] done
clear
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question_answer 32)
Which or me following are found in biological fluids \[N{{a}^{+}},M{{g}^{2+}},C{{a}^{2+}},{{K}^{+}},S{{r}^{2+}},L{{i}^{+}}\] and \[B{{a}^{2+}}\]?
A)
\[M{{g}^{2+}},C{{a}^{2+}},\] and \[S{{r}^{2+}}\] done
clear
B)
\[N{{a}^{2+}}\] and \[{{K}^{+}}\] done
clear
C)
\[N{{a}^{+}},{{K}^{+}},M{{g}^{2+}}\] and \[C{{a}^{2+}}\] done
clear
D)
\[S{{r}^{+}},Li\] and \[B{{a}^{2+}}\] done
clear
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question_answer 33)
Metallic magnesium is prepared by
A)
reduction of \[MgO\] by coke. done
clear
B)
electrolysis of aqueous solution of \[Mg{{(N{{O}_{3}})}_{2}}.\] done
clear
C)
displacement of \[Mg\] by iron from \[MgS{{O}_{4}}\] solution. done
clear
D)
electrolysis of molten \[MgC{{l}_{2}}\] done
clear
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question_answer 34)
A compound (A) is used in preparation of washing soda to recover ammonia in Solvay's process. When\[C{{O}_{2}}\]. is bubbled through an aqueous solution of (A), the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
A)
\[Ca{{(HC{{O}_{3}})}_{2}}\] done
clear
B)
\[CaO\] done
clear
C)
\[Ca{{(OH)}_{2}}\] done
clear
D)
\[CaC{{O}_{3}}\] done
clear
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question_answer 35)
\[Be{{F}_{2}}\] is soluble in water whereas fluorides of other alkaline earth metals are insoluble because of
A)
ionic nature of \[Be{{F}_{2}}\]. done
clear
B)
covalent nature of \[Be{{F}_{2}}\]. done
clear
C)
greater hydration energy of \[B{{e}^{2+}}\] ion as compared to its lattice energy. done
clear
D)
none of these. done
clear
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question_answer 36)
Which category of salts of alkaline earth metals is not found in solid sate, but found in solution state?
A)
Carbonates done
clear
B)
Bicarbonates done
clear
C)
Hydroxides done
clear
D)
Sulphates done
clear
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question_answer 37)
Sodium carbonate solution in water is alkaline due to
A)
hydrolysis of \[N{{a}^{+}}\] done
clear
B)
hydrolysis of \[CO_{3}^{2-}\] done
clear
C)
hydrolysis of both \[N{{a}^{+}}\] and \[CO_{3}^{2-}\] ions done
clear
D)
None of these done
clear
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question_answer 38)
When a crystal of caustic soda is exposed to air, a liquid layer is deposited because :
A)
Crystal loses water done
clear
B)
Crystal absorbs moisture and \[C{{O}_{2}}\] done
clear
C)
Crystal melts done
clear
D)
Crystal sublimes done
clear
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question_answer 39)
Which of the following statements is correct for \[CsB{{r}_{3}}\]?
A)
It is a covalent compound. done
clear
B)
It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\] ions. done
clear
C)
It contains \[C{{s}^{+}}\] and \[B{{r}_{3}}^{-}\] ions done
clear
D)
It contains \[C{{s}^{+}},\] and \[B{{r}^{-}}\] and lattice \[B{{r}_{2}}\] molecule. done
clear
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question_answer 40)
The pair of compounds which cannot exits together in solution is
A)
\[NaHC{{O}_{3}}\] and \[NaOH\] done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}\] and \[NaHC{{O}_{3}}\] done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}\] and \[NaOH\] done
clear
D)
\[NaHC{{O}_{3}}\] and \[NaCl\] done
clear
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question_answer 41)
\[N{{a}_{2}}S{{O}_{3}}\] and \[NaHC{{O}_{3}}\] may be distinguished by treating their aqueous solution with :
A)
\[MgO\] done
clear
B)
\[MgS{{O}_{4}}\] done
clear
C)
litmus solution, done
clear
D)
dil .acid done
clear
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question_answer 42)
Substance which absorbs \[C{{O}_{2}},\] and violently reacts with \[{{H}_{2}}O\] with sound is :
A)
\[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
\[CaC{{O}_{3}}\] done
clear
C)
\[ZnO\] done
clear
D)
\[CaO\] done
clear
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question_answer 43)
When sulphur is heated with \[NaOH\,(aq)\]. The compounds formed are
A)
\[N{{a}_{2}}S+{{H}_{2}}O\] done
clear
B)
\[N{{a}_{2}}S{{O}_{3}}+{{H}_{2}}O\] done
clear
C)
\[N{{a}_{2}}S+N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\] done
clear
D)
\[N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{H}_{2}}O\] done
clear
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question_answer 44)
The metal X is prepared by the electrolysis of fused chloride. It reacts with hydrogen to form a colourless solid from which hydrogen is released on treatment with water. The metal is:
A)
\[Ca\] done
clear
B)
\[Al\] done
clear
C)
\[Zn\] done
clear
D)
\[Cu\] done
clear
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question_answer 45)
Acidified solution of sodium thiosulphate is unstable because in thiosulphate
A)
the sulphur atoms are at unstable oxidation state of \[+2\] done
clear
B)
the two sulphur atoms are at different oxidation states of \[+6\] and \[-2\] done
clear
C)
the \[S-S\] bond are unstable bonds. done
clear
D)
sulphur is in zero oxidation state. done
clear
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question_answer 46)
Two metals (A) and (B) belong to the same group of the periodic table. Metal (A) forms an insoluble oxide but a soluble sulphate, metal (B) forms a soluble oxide but an insoluble sulphate. Both metals (A) and (B) form hydroxides which are soluble m alkalis, (A) and (B) are
A)
\[Ba\] and \[Mg\] done
clear
B)
\[Na\] and \[K\] done
clear
C)
\[Mg\] and \[Ba\] done
clear
D)
\[K\] and \[Rb\] done
clear
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question_answer 47)
Among the given statements, the incorrect one is
A)
\[Be\] differs much from other alkali metals than \[Li\] does from other alkali metals. done
clear
B)
\[Be\] generally forms covalent compounds done
clear
C)
\[Be\] forms a very strong complex \[{{[Be{{({{H}_{2}}O)}_{4}}]}^{2+}}\]. done
clear
D)
\[Be\] usually has more than four water of crystallisation associated with it. done
clear
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question_answer 48)
Calcium imide on hydrolysis gives gas (B) which on oxidation by bleaching powder gives gas (C) Gas (C) on reaction with magnesium give compound (D) which on hydrolysis gives agar gas (B). Identify (B), (C) and (D).
A)
\[N{{H}_{3}},{{N}_{2}},M{{g}_{3}}{{N}_{2}}\] done
clear
B)
\[{{N}_{2}},N{{H}_{3}},MgNH\] done
clear
C)
\[{{N}_{2}},{{N}_{2}}{{O}_{5}},Mg{{(N{{O}_{3}})}_{2}}\] done
clear
D)
\[N{{H}_{3}},N{{O}_{2}},Mg{{(N{{O}_{2}})}_{2}}\] done
clear
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question_answer 49)
Which one is the correct statement with reference to solubility of \[MgS{{O}_{4}}\] in water?
A)
\[S{{O}_{4}}^{2-}\] ion mainly contributes towards hydration energy. done
clear
B)
Sizes of \[M{{g}^{2+}}\] and \[S{{O}_{4}}^{2-}\] are similar. done
clear
C)
Hydration energy of \[MgS{{O}_{4}}\] is higher in comparison to its lattice energy. done
clear
D)
Ionic potential (charge/radius ratio) of \[M{{g}^{2+}}\] is very low. done
clear
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question_answer 50)
A solid compound 'X' on heating gives \[C{{O}_{2}}\] gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of \[C{{O}_{2}}\] through 'Y' water, a clear solution 'Z', is obtained. On boil. 'Z', compound 'X' is reformed. The compound 'X' is
A)
\[Ca{{(HC{{O}_{3}})}_{2}}\] done
clear
B)
\[CaC{{O}_{3}}\] done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
D)
\[{{K}_{2}}C{{O}_{3}}\] done
clear
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question_answer 51)
Amongst the following hydroxides, the one which has the lowest value of \[{{K}_{sp}}\] is :
A)
\[Ca{{(OH)}_{2}}\] done
clear
B)
\[Mg{{(OH)}_{2}}\] done
clear
C)
\[Be{{(OH)}_{2}}\] done
clear
D)
\[Ba{{(OH)}_{2}}\] done
clear
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question_answer 52)
For which one of the following minerals. The composition given is incorrect?
A)
Soda ash - \[(N{{a}_{2}}C{{O}_{3}})\] done
clear
B)
Camallite - \[(KCl . MgC{{l}_{2}} . 6{{H}_{2}}O)\] done
clear
C)
Borax - \[(N{{a}_{2}}{{B}_{4}}{{O}_{7}} . 7{{H}_{2}}O)\] done
clear
D)
Glauber's salt - \[(N{{a}_{2}}S{{O}_{4}} . 10{{H}_{2}}O)\] done
clear
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question_answer 53)
The difference of number of water molecules in gypsum and plaster of Paris is
A)
\[\frac{5}{1}\] done
clear
B)
2 done
clear
C)
\[1/2\] done
clear
D)
\[1\frac{1}{2}\] done
clear
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question_answer 54)
Which is not obtained when metal carbides react with \[{{H}_{2}}O\]?
A)
\[A{{l}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\] done
clear
B)
\[Ca{{C}_{2}}+{{H}_{2}}O\xrightarrow{{}}CH\equiv CH\] done
clear
C)
\[M{{g}_{4}}{{C}_{3}}+{{H}_{2}}O\xrightarrow{{}}C{{H}_{3}}C\equiv CH\] done
clear
D)
\[B{{e}_{2}}C+{{H}_{2}}O\xrightarrow{{}}C{{H}_{4}}\] done
clear
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question_answer 55)
\[CaC{{l}_{2}}\] is preferred over \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because:
A)
\[CaC{{l}_{2}}\] is less soluble in \[{{H}_{2}}O\] than \[NaCl\] done
clear
B)
\[CaC{{l}_{2}}\] is hygroscopic but \[NaCl\] is not done
clear
C)
Eutectic mixture of \[CaC{{l}_{2}}/{{H}_{2}}O\] freezes at \[-55{}^\circ C\] while that of \[NaCl/{{H}_{2}}O\] freezes at \[-18{}^\circ C\] done
clear
D)
\[NaCl\] makes the road slipperty but \[CaC{{l}_{2}}\] does not done
clear
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question_answer 56)
Which of the following statement about the sulphate of alkali metal is correct?
A)
Except \[L{{i}_{2}}S{{O}_{4}}\] all sulphate of other alkali metals are soluble in water done
clear
B)
All sulphate salts of alkali metals except lithium sulphate forms alum. done
clear
C)
All sulphate salts of alkali metals except lithium sulphate do not decompose at high. Temperature done
clear
D)
All of the above done
clear
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question_answer 57)
\[M{{g}_{2}}{{C}_{3}}\] reacts with water forming propyne gas \[C_{3}^{4-}\] ions has:
A)
two sigma and two pi bonds done
clear
B)
three sigma and one pi bond done
clear
C)
two sigma and one pi bond done
clear
D)
two sigma and three pi bonds done
clear
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question_answer 58)
If \[NaOH\]is added to an aqueous solution of \[Z{{n}^{2+}}\] ions, a white precipitate appears and on adding excess \[NaOH,\]the precipitate dissolves. In this solution zinc exists in the:
A)
both in cafionic and anionic parts done
clear
B)
there is no zinc left in the solution done
clear
C)
cationic part done
clear
D)
anionic part. done
clear
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question_answer 59)
Which is incorrect statement?
A)
The heats of hydration of the dipositive alkaline earth metal decrease with an increase in their ionic size done
clear
B)
\[NaN{{O}_{3}}\] forms \[N{{a}_{2}}{{O}_{2}}\] on heating done
clear
C)
Hydration of alkali metal ion is less than that of IIA group done
clear
D)
Alkaline earth metal ions, because of their much larger charge to size ratio, exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them done
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question_answer 60)
Which of the following does not form an oxide on heating?
A)
\[ZnC{{O}_{3}}\] done
clear
B)
\[CaC{{O}_{3}}\] done
clear
C)
\[L{{i}_{2}}C{{O}_{3}}\] done
clear
D)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
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