21
MCQ (Multiple Correct Answer)
Which of the following statement(s) is/are correct in the case of heavy water?
A
Heavy water is used as a moderator in nuclear reactor
B
Heavy water is more effective as solvent than ordinary water
C
Heavy water is more associated than ordinary water
D
Heavy water has lower boiling point than ordinary water
22
MCQ (Multiple Correct Answer)
Which of the following statements about hydrogen are correct?
A
Hydrogen has three isotopes of which protium is the most common
B
Hydrogen never acts as cation in ionic salts
C
Hydrogen ion, $\mathrm{H}^{+}$, exists freely in solution
D
Dihydrogen does not act as a reducing agent
23
MCQ (Multiple Correct Answer)
Some of the properties of water are described below. Which of them is/are not correct?
A
Water is known to be a universal solvent
B
Hydrogen bonding is present to a large extent in liquid water
C
There is no hydrogen bonding in the frozen state of water
D
Frozen water is heavier than liquid water
24
MCQ (Multiple Correct Answer)
Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of
A
chlorides of Ca and Mg in water
B
sulphates of Ca and Mg in water
C
hydrogen carbonates of Ca and Mg in water
D
carbonates of alkali metals in water
25
MCQ (Multiple Correct Answer)
Which of the following statements is correct?
A
Elements of group 15 form electron deficient hydrides
B
All elements of group 14 form electron precise hydrides
C
Electron precise hydrides have tetrahedral geometries.
D
Electron rich hydrides can act as Lewis acids.