12th Grade > Chemistry
HYDROGEN MCQs
Total Questions : 30
| Page 2 of 3 pages
Answer: Option B. -> Sodium borohydride reacts very violently with cold water to produce H2
:
B
Reaction of NaBH4with cold water is very slow. All other statements except (b) are correct.
:
B
Reaction of NaBH4with cold water is very slow. All other statements except (b) are correct.
Answer: Option A. -> II and III
:
A
As a fuel, hydrogen is very difficult to store. It is extremely reactive and it combines with most of the metals and non-metals forming stable compounds. Thusit is not available in the free state.
On the other hand, the calorific value of H2 is very high - 150KJ/g, and so can be very useful as a fuel.
Similarly, it is an extremely clean fuel that releases only water upon combustion. Thus, cleanliness doesn't hinder its usefullness either.
:
A
As a fuel, hydrogen is very difficult to store. It is extremely reactive and it combines with most of the metals and non-metals forming stable compounds. Thusit is not available in the free state.
On the other hand, the calorific value of H2 is very high - 150KJ/g, and so can be very useful as a fuel.
Similarly, it is an extremely clean fuel that releases only water upon combustion. Thus, cleanliness doesn't hinder its usefullness either.
Answer: Option A. -> D > A > B > C
:
A
Hardness∝1molarmass
:
A
Hardness∝1molarmass
Answer: Option D. -> Lead sulphide suspension
:
D
PbS +4H2O2→PbSO4 + 4H2O
:
D
PbS +4H2O2→PbSO4 + 4H2O
Answer: Option A. -> PbO2
:
A
PbO2is not a peroxide
:
A
PbO2is not a peroxide
Answer: Option B. -> PdH
:
B
Interstitial hydride
:
B
Interstitial hydride
Answer: Option C. -> both CO and H2
:
C
Syngas(water gas) is a mixture of CO and H2
:
C
Syngas(water gas) is a mixture of CO and H2
Answer: Option A. -> CuSO4.5H2O
:
A
In CuSO4.5H2O, one molecule of wateris hydrogen bonded with CuSO4.
:
A
In CuSO4.5H2O, one molecule of wateris hydrogen bonded with CuSO4.
Answer: Option D. -> Cu
:
D
As its standard reduction potential is high
:
D
As its standard reduction potential is high
Answer: Option A. -> H2O : High dielectric constant, low molar mass
:
A
Dielectric constant of water is higher, whereas its molar mass is 18 and lower than the molar mass of D2O
:
A
Dielectric constant of water is higher, whereas its molar mass is 18 and lower than the molar mass of D2O
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