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InOrganic Chemistry -- Hydrogen and Oxygen
1.
The hydrogen molecule is not very reactive under normal conditions because
- A.hydrogen has a large number of isotopes
- B.the corresponding △So value is very low
- C.the bond dissociation energy of the hydrogen molecule is high
- D.the hydrogen molecule has a low activation energy
- Answer
- Report
Answer : [C]
2.
The ionization constant of protium in water (H2O⇌H+ + OH-) is 1.0 x 10-14 and that in heavy water (D2O⇌ D+ + OD-) is 3.0 x 10-15.H2O dissociates about
- A.three times as much as D2O does
- B.thirty times as much as D2O does.
- C.0.3 times as much as D2O does
- D.300 times as much as D2O does.
- Answer
- Report
Answer : [A]
3.
The order of the heats of fusion of T2, D2 and H2 is
- A.T2 > D2 > H2
- B.H2 > T2 > D2
- C.D2 > T2 > H2
- D.D2 = T2 > H2
- Answer
- Report
Answer : [A]
4.
The higher density of water than that of ice is due to
- A.dipole-dipole interaction
- B.dipole–induced dipole interaction
- C.hydrogen bonding
- D.all of these
- Answer
- Report
Answer : [C]
5.
In parahydrogen, the electron spins are in the
- A.same direction but the proton spins are in opposite directions
- B.opposite directions but the proton spins are in the same direction
- C.same direction as the proton spins
- D.opposite direction to the proton spins
- Answer
- Report
Answer : [D]
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