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question_answer1)
Synthetic detergents are more effective in hard water than soaps because [AMU 2002]
A)
They are highly soluble in water done
clear
B)
Their \[C{{a}^{++}}\] and \[M{{g}^{++}}\] salts are water soluble done
clear
C)
Their \[C{{a}^{++}}\] and \[M{{g}^{++}}\] salts are insoluble in water done
clear
D)
None of these done
clear
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question_answer2)
\[{{D}_{2}}O\] is used more in [BHU 1997; CPMT 1997]
A)
Chemical industry done
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B)
Nuclear reactor done
clear
C)
Pharmaceutical preparations done
clear
D)
Insecticide preparation done
clear
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question_answer3)
Heavy water \[({{D}_{2}}O)\] is [RPET/PMT 2000; CPMT 2000]
A)
A product of oxygen and hydrogen done
clear
B)
Water of mineral springs done
clear
C)
Water obtained by repeated distillation and condensation done
clear
D)
Ordinary water containing dissolved salts heavy metals done
clear
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question_answer4)
Temporary hardness may be removed from water by adding [Pb. PMT 2002]
A)
\[CaC{{O}_{3}}\] done
clear
B)
\[Ca{{(OH)}_{2}}\] done
clear
C)
\[CaS{{O}_{4}}\] done
clear
D)
HCl done
clear
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question_answer5)
Heavy water is [AFMC 1997; UPSEAT 2003 MH CET 2003; Pb. CET 2001]
A)
Water containing Fe, Cr, Mn done
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B)
Water at 0°C done
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C)
\[{{D}_{2}}O\] done
clear
D)
Water obtained after a number of distillations done
clear
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question_answer6)
Heavy water is compound of [DPMT 2001; DCE 2002]
A)
Oxygen and heavier isotopes of hydrogen done
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B)
Hydrogen and heavier isotopes of oxygen done
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C)
Heavier isotopes of oxygen and hydrogen done
clear
D)
None of these done
clear
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question_answer7)
Which of the following pair of ions makes the water hard [AMU 2002]
A)
\[N{{a}^{+}},\ SO_{4}^{2-}\] done
clear
B)
\[{{K}^{+}},\ HCO_{3}^{-}\] done
clear
C)
\[C{{a}^{2+}},\ NO_{3}^{-}\] done
clear
D)
\[NH_{4}^{+},\ C{{l}^{-}}\] done
clear
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question_answer8)
Temporary hardness of water can be removed by [Pb. PMT 2001]
A)
Addition of potassium permagenate done
clear
B)
Boiling done
clear
C)
Filtration done
clear
D)
Addition of chlorine done
clear
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question_answer9)
When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with [DPMT 2000]
A)
\[O{{H}^{-}}\] ions done
clear
B)
\[SO_{4}^{2-}\] ions done
clear
C)
\[C{{a}^{2+}}\] ions done
clear
D)
\[{{H}^{+}}\] ions done
clear
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question_answer10)
Which of the following statements do not define the characteristic property of water? Water is a universal solvent?
A)
It can dissolve maximum number of compounds done
clear
B)
It has very low dielectric constant done
clear
C)
It has high liquid range done
clear
D)
None of these done
clear
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question_answer11)
The velocity of neutrons in nuclear reactor is slowed down by
A)
Heavy water \[({{D}_{2}}O)\] done
clear
B)
Ordinary water \[({{H}_{2}}O)\] done
clear
C)
Zinc rod done
clear
D)
Fused caustic soda done
clear
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question_answer12)
Temporary hardness of water is due to the presence of
A)
Magnesium bicarbonate done
clear
B)
Calcium chloride done
clear
C)
Magnesium sulphate done
clear
D)
Calcium carbonate done
clear
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question_answer13)
Which of the following is not true
A)
Hardness of water depends on its behaviour towards soap done
clear
B)
The temporary hardness is due to the presence of Ca and Mg bicarbonates done
clear
C)
Permanent hardness is due to the presence of soluble Ca and Mg sulphates, chlorides and nitrates done
clear
D)
Permanent hardness can be removed by boiling the water done
clear
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question_answer14)
The molarity of pure water at \[4{}^\circ C\]is
A)
1 M done
clear
B)
2.5 M done
clear
C)
5 M done
clear
D)
55.5 M done
clear
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question_answer15)
Which of the following is not a hard water
A)
Water containing \[CaC{{l}_{2}}\] done
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B)
Water containing dil. HCl done
clear
C)
Water containing \[MgS{{O}_{4}}\] done
clear
D)
None of these done
clear
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question_answer16)
Heavy water is used in atomic reactor as
A)
Coolant done
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B)
Moderator done
clear
C)
Both moderator and coolant done
clear
D)
Neither coolant nor moderator done
clear
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question_answer17)
Heavy water freezes at
A)
\[0{}^\circ C\] done
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B)
\[3.8{}^\circ C\] done
clear
C)
\[38{}^\circ C\] done
clear
D)
\[0.38{}^\circ C\] done
clear
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question_answer18)
The pH of \[{{D}_{2}}O\] and \[{{H}_{2}}O\] at 298 K is
A)
7.0, 7.0 done
clear
B)
7.35, 7.0 done
clear
C)
7.0, 6.85 done
clear
D)
6.85, 7.35 done
clear
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question_answer19)
Which of the following is not true
A)
Ordinary water is electrolysed more rapidly than \[{{D}_{2}}O\] done
clear
B)
Reaction between \[{{H}_{2}}\] and \[C{{l}_{2}}\] is much faster than \[{{D}_{2}}\] and \[C{{l}_{2}}\] done
clear
C)
\[{{D}_{2}}O\] freezes at lower temperature than \[{{H}_{2}}O\] done
clear
D)
Bond dissociation energy for \[{{D}_{2}}\] is greater than \[{{H}_{2}}\] done
clear
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question_answer20)
Which of the following will determine whether the given colourless liquid is water or not
A)
Melting done
clear
B)
Tasting done
clear
C)
Phosphthalein done
clear
D)
Adding a pinch of anhydrous \[CuS{{O}_{4}}\] done
clear
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question_answer21)
Lead pipes are not used for carrying drinking water because
A)
They are covered with a coating of lead carbonate done
clear
B)
They are corroded by air and moisture done
clear
C)
Water containing dissolved air attacks lead forming soluble hydroxide done
clear
D)
None of these done
clear
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question_answer22)
Which one of the following removes temporary hardness of water
A)
Slaked lime done
clear
B)
Plaster of Paris done
clear
C)
Cuprous done
clear
D)
Hydrolith done
clear
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question_answer23)
Which of the following will cause softening of hard water
A)
Passing it through cation exchange resin done
clear
B)
Passing it through anion exchange resin done
clear
C)
Passing it through sand done
clear
D)
Passing it through alumina done
clear
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question_answer24)
which of the following process permanent hardness of water can be removed, by adding [AFMC 2005]
A)
Sodalime done
clear
B)
Sodiumbicarbonate done
clear
C)
Washing soda done
clear
D)
Sodium chloride done
clear
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question_answer25)
Permutit is technical name given to
A)
Aluminates of calcium and sodium done
clear
B)
Silicates of calcium and sodium done
clear
C)
Hydrated silicates of aluminium and sodium done
clear
D)
Silicates of calcium and magnesium done
clear
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question_answer26)
The approximate mass of tritium oxide molecule is
A)
18 amu done
clear
B)
20 amu done
clear
C)
22 amu done
clear
D)
24 amu done
clear
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question_answer27)
Molecular weight of heavy water is
A)
19 done
clear
B)
18 done
clear
C)
17 done
clear
D)
20 done
clear
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question_answer28)
Water is said to be permanently hard when it contains
A)
Sulphates of Mg and Ca done
clear
B)
Bicarbonates of Mg and Ca done
clear
C)
Sulphates of Cu and Hg done
clear
D)
Carbonates and bicarbonates of Mg and Ca done
clear
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question_answer29)
Sodium sulphate is soluble in water but barium sulphate is insoluble because [Pb. PMT 1995]
A)
The hydration energy of \[N{{a}_{2}}S{{O}_{4}}\] is more than its lattice energy done
clear
B)
The lattice energy of \[BaS{{O}_{4}}\] is more than its hydration energy done
clear
C)
The lattice energy has no role to play in solubility done
clear
D)
The hydration energy of \[N{{a}_{2}}S{{O}_{4}}\] is less than its lattice energy done
clear
E)
Both a and b done
clear
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question_answer30)
The alum used for purifying water is [EAMCET 1999]
A)
Ferric alum done
clear
B)
Chrome alum done
clear
C)
Potash alum done
clear
D)
Ammonium alum done
clear
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question_answer31)
Which of the following metal will not reduce \[{{H}_{2}}O\] [CPMT 1999]
A)
Ca done
clear
B)
Fe done
clear
C)
Cu done
clear
D)
Li done
clear
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question_answer32)
Which of the following is correct about heavy water [DCE 2002]
A)
Water at 4°C having maximum density is known as heavy water done
clear
B)
It is heavier than water \[({{H}_{2}}O)\] done
clear
C)
It is formed by the combination of heavier isotope of hydrogen and oxygen done
clear
D)
None of these done
clear
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question_answer33)
The boiling point of water is exceptionally high because [KCET 2001]
A)
There is covalent bond between H and O done
clear
B)
Water molecule is linear done
clear
C)
Water molecules associate due to hydrogen bonding done
clear
D)
Water molecule is not linear done
clear
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question_answer34)
Match list I with list II and select the correct answer using the codes given below the lists [SCRA 2001]
| List I | List II |
1. | Heavy water | Bicarbonates of Mg and Ca in water |
2. | Temporary hard water | No foreign ions in water |
3. | Soft water | \[{{D}_{2}}O\] |
4. | Permanent hard water | Sulphates and chlorides of Mg and Ca in water |
Codes
A)
1-c, 2-d, 3-b, 4-a done
clear
B)
1-b, 2-a, 3-c, 4-d done
clear
C)
1-b, 2-d, 3-c, 4-a done
clear
D)
1-c, 2-a, 3-b, 4-d done
clear
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question_answer35)
The \[H-O-H\] angle in water molecule is about [AFMC 2001]
A)
\[90{}^\circ \] done
clear
B)
\[180{}^\circ \] done
clear
C)
\[102{}^\circ \] done
clear
D)
\[105{}^\circ \] done
clear
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question_answer36)
When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together [AFMC 2001]
A)
Hydrogen bond formation done
clear
B)
Van der Waals forces done
clear
C)
Covalent attraction done
clear
D)
Ionic interaction done
clear
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question_answer37)
What is formed when calcium carbide reacts with heavy water [Manipal PMT 2001; Pb. CET 2000]
A)
\[{{C}_{2}}{{D}_{2}}\] done
clear
B)
\[Ca{{D}_{2}}\] done
clear
C)
\[C{{a}_{2}}{{D}_{2}}O\] done
clear
D)
\[C{{D}_{2}}\] done
clear
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question_answer38)
Pure water can be obtained from sea water by [CBSE PMT 2001]
A)
Centrifugation done
clear
B)
Plasmolysis done
clear
C)
Reverse osmosis done
clear
D)
Sedimentation done
clear
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question_answer39)
Action of water or dilute mineral acids on metals can give [Kerala PMT 2002]
A)
Monohydrogen done
clear
B)
Tritium done
clear
C)
Dihydrogen done
clear
D)
Trihydrogen done
clear
E)
\[{{D}_{2}}\] done
clear
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question_answer40)
Metal which does not react with cold water but evolves \[{{H}_{2}}\] with steam is [DCE 2002]
A)
Na done
clear
B)
K done
clear
C)
Pt done
clear
D)
Fe done
clear
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question_answer41)
pH of neutral water at room temperature nearly
A)
0 done
clear
B)
14 done
clear
C)
7 done
clear
D)
\[{{10}^{-7}}\] done
clear
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question_answer42)
Maximum number of hydrogen bonding in \[{{H}_{2}}O\] is [DCE 2004; MP PET 2004; MP PMT 2004; BHU 2004]
A)
1 done
clear
B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
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question_answer43)
The low density of ice compared to water is due to [Pb. CET 2004]
A)
Induced dipole-induced dipole interactions done
clear
B)
Dipole-induced dipole interaction done
clear
C)
Hydrogen bonding interactions done
clear
D)
Dipole-dipole interactions done
clear
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question_answer44)
Which of the following acid is formed when \[Si{{F}_{4}}\] reacts with water [BHU 2004]
A)
\[Si{{F}_{4}}\] done
clear
B)
\[{{H}_{2}}Si{{F}_{4}}\] done
clear
C)
\[{{H}_{2}}S{{O}_{4}}\] done
clear
D)
\[{{H}_{2}}Si{{F}_{6}}\] done
clear
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question_answer45)
Triple point of water is [AFMC 2004]
A)
\[273K\] done
clear
B)
\[373K\] done
clear
C)
\[203K\] done
clear
D)
\[193K\] done
clear
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question_answer46)
Hardness of water is due to presence of salts of [BHU 2005]
A)
\[N{{a}^{+}}\] and \[{{K}^{+}}\] done
clear
B)
\[C{{a}^{2+}}\]and \[M{{g}^{2+}}\] done
clear
C)
\[C{{a}^{2+}}\]and \[{{K}^{+}}\] done
clear
D)
\[C{{a}^{2+}}\] and \[N{{a}^{+}}\] done
clear
View Solution play_arrow