-
question_answer1)
Polyphosphates are used as water softening agents because they [IIT JEE (Screening) 2002]
A)
Form soluble complexes with anionic species done
clear
B)
Precipitate anionic species done
clear
C)
Forms soluble complexes with cationic species done
clear
D)
Precipitate cationic species done
clear
View Solution play_arrow
-
question_answer2)
The critical temperature of water is higher than that of \[{{O}_{2}}\] because \[{{H}_{2}}O\] molecule has [IIT 1997]
A)
Fewer electrons than oxygen done
clear
B)
Two covalent bonds done
clear
C)
V-shape done
clear
D)
Dipole moment done
clear
View Solution play_arrow
-
question_answer3)
One mole of calcium phosphide on reaction with excess water gives [IIT 1999]
A)
One mole of phosphene done
clear
B)
Two moles of phosphoric acid done
clear
C)
Two moles of phosphine done
clear
D)
One mole of phosphorus pentaoxide done
clear
View Solution play_arrow
-
question_answer4)
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with [IIT 1990]
A)
\[{{H}^{+}}\]ions done
clear
B)
\[C{{a}^{2+}}\]ions done
clear
C)
\[M{{g}^{2+}}\]ions done
clear
D)
Both \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\] done
clear
View Solution play_arrow
-
question_answer5)
Hydrogen peroxide is
A)
A stronger acid than water done
clear
B)
A weaker acid than water done
clear
C)
An oxidising agent done
clear
D)
A reducing agent done
clear
View Solution play_arrow
-
question_answer6)
Hydrogen can be obtained from water by
A)
Reaction with metal oxides done
clear
B)
Reaction with non-metal oxides done
clear
C)
Reaction with metals done
clear
D)
Reaction with metal hydrides done
clear
View Solution play_arrow
-
question_answer7)
Which of the following is/are hard water(s)
A)
Water containing some potash alum done
clear
B)
Water containing a few drops of HCl done
clear
C)
Water containing common salt done
clear
D)
Water containing calcium nitrate done
clear
View Solution play_arrow
-
question_answer8)
Pick the odd one out
A)
Sodium borohydride reacts very slowly with cold water done
clear
B)
Sodium borohydride reacts very violently with cold water to produce \[{{H}_{2}}\] done
clear
C)
Solubility of sodium borohydride in water at \[25{}^\circ C\] is 10.05 g/mL done
clear
D)
Melting point of sodium borohydride is \[500{}^\circ C\] done
clear
View Solution play_arrow
-
question_answer9)
Hydrogen can be obtained from water, by the action of water on
A)
Calcium carbide done
clear
B)
Calcium hydride done
clear
C)
Calcium oxide done
clear
D)
Calcium done
clear
View Solution play_arrow
-
question_answer10)
What is true about ice
A)
Its density is more than water done
clear
B)
It is a good conductor of heat done
clear
C)
It is a thermal insulator done
clear
D)
Its density is less than water done
clear
View Solution play_arrow
-
question_answer11)
Hydrogen will not reduce [IIT 1985]
A)
Heated cupric oxide done
clear
B)
Heated ferric oxide done
clear
C)
Heated stannic oxide done
clear
D)
Heated aluminium oxide done
clear
View Solution play_arrow
-
question_answer12)
HCl is added to following oxides. Which one would give \[{{H}_{2}}{{O}_{2}}\] [IIT 1980]
A)
\[Mn{{O}_{2}}\] done
clear
B)
\[Pb{{O}_{2}}\] done
clear
C)
BaO done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer13)
Which of the following pair will not produce dihydrogen gas [IIT 1994]
A)
\[Cu+HCl(dil.)\] done
clear
B)
\[Fe+{{H}_{2}}S{{O}_{4}}\] done
clear
C)
\[Mg+\text{steam}\] done
clear
D)
\[Na+\text{alcohol}\] done
clear
View Solution play_arrow
-
question_answer14)
The amount of \[{{H}_{2}}{{O}_{2}}\] present in 1 L of 1.5 N\[{{H}_{2}}{{O}_{2}}\] solution is [IIT 1991]
A)
2.5 g done
clear
B)
25.5 g done
clear
C)
3.0 g done
clear
D)
8.0 g done
clear
View Solution play_arrow
-
question_answer15)
Hydrogen is evolved by the action of cold dil. \[HN{{O}_{3}}\] on [IIT 1998]
A)
Fe done
clear
B)
Mn done
clear
C)
Cu done
clear
D)
Al done
clear
View Solution play_arrow
-
question_answer16)
Hydrogen can behave as a metal
A)
At very high temperature done
clear
B)
At very low temperature done
clear
C)
At very high pressure done
clear
D)
At very low pressure done
clear
View Solution play_arrow
-
question_answer17)
\[{{D}_{2}}O\] is preferred to \[{{H}_{2}}O\], as a moderator, in nuclear reactors because
A)
\[{{D}_{2}}O\] slows down fast neutrons better done
clear
B)
\[{{D}_{2}}O\] has high specific heat done
clear
C)
\[{{D}_{2}}O\] is cheaper done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer18)
Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy is
A)
Ortho done
clear
B)
Meta done
clear
C)
Para done
clear
D)
All have same energy done
clear
View Solution play_arrow
-
question_answer19)
Saline hydrides react explosively with water, such fires can be extinguished by
A)
Water done
clear
B)
Carbon dioxide done
clear
C)
Sand done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer20)
Metals of groups 7, 8 and 9 do not form metallic hydrides. This is termed as
A)
Hydride gap done
clear
B)
Hydride shift done
clear
C)
Anhydride done
clear
D)
Dehydride done
clear
View Solution play_arrow
-
question_answer21)
When temporary hard water containing \[Mg{{(HC{{O}_{3}})}_{2}}\] is boiled the ppt. formed is of
A)
\[MgC{{O}_{3}}\] done
clear
B)
MgO done
clear
C)
\[Mg{{(OH)}_{2}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer22)
Permanent hardness due to \[M{{g}^{2+}}\] ions is best removed by
A)
\[Ca{{(OH)}_{2}}\] done
clear
B)
\[N{{a}_{2}}C{{O}_{3}}\] done
clear
C)
\[N{{a}_{2}}C{{O}_{3}}+Ca{{(OH)}_{2}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer23)
The most abundant element in the universe is
A)
Carbon done
clear
B)
Silicon done
clear
C)
Hydrogen done
clear
D)
Helium done
clear
View Solution play_arrow
-
question_answer24)
Pick out the correct statement
A)
By decreasing the temperature pure para-hydrogen can be obtained done
clear
B)
By increasing the temperature pure ortho-hydrogen can be obtained done
clear
C)
By decreasing the temperature pure ortho-hydrogen can be obtained done
clear
D)
By increasing the temperature pure para-hydrogen can be obtained done
clear
View Solution play_arrow
-
question_answer25)
Hydrogen can be produced by heating
A)
Cu with \[{{H}_{2}}S{{O}_{4}}\] done
clear
B)
Sodium formate done
clear
C)
Sodium oxalate done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer26)
Plumbosolvency is a health hazard in the transportation of
A)
Hard water only done
clear
B)
Soft water only done
clear
C)
Both a and b done
clear
D)
Water containing plum juice done
clear
View Solution play_arrow
-
question_answer27)
A sample of water contains sodium chloride. It is
A)
Hard water done
clear
B)
Soft water done
clear
C)
Moderately hard done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer28)
Hardness producing salt, whose solubility in water decreases with rise of temperature is
A)
\[CaC{{l}_{2}}\] done
clear
B)
\[CaS{{O}_{4}}\] done
clear
C)
\[Ca{{(HC{{O}_{3}})}_{2}}\] done
clear
D)
\[MgS{{O}_{4}}\] done
clear
View Solution play_arrow
-
question_answer29)
A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will be
A)
Tasteless done
clear
B)
Sweet done
clear
C)
Salty done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer30)
Water obtained by purification with organic ion exchange resins is
A)
Pure water done
clear
B)
Free from only \[C{{a}^{2+}}\], \[M{{g}^{2+}}\] ions done
clear
C)
Free from \[HCO_{3}^{-},\ SO_{4}^{2-}\] and \[C{{l}^{-}}\]ions only done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer31)
Which of the following can effectively remove all types of hardness of water
A)
Soap done
clear
B)
Washing soda done
clear
C)
Slaked lime done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer32)
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly [KCET 2005]
A)
1% done
clear
B)
3% done
clear
C)
10% done
clear
D)
90% done
clear
View Solution play_arrow