Question

Choose the correct statement(s):

• A. The oxides and the peroxides of alkali metals are colorless when pure.
• B. The superoxides of alkali metals are yellow or orange in color.
• C. Oxides are hydrolyzed by water to form the hydroxides.
• D. The superoxides of alkali metals are diamagnetic.

Answer 1

Answer: (A), (B), (C)

The correct options are
A The oxides and the peroxides of alkali metals are colorless when pure.
B The superoxides of alkali metals are yellow or orange in color.
C Oxides are hydrolyzed by water to form the hydroxides.

The oxides and the peroxides of alkali metals are colorless when pure.
The superoxides of alkali metals are are yellow or orange in color and are paramagnetic.
Oxides are hydrolyzed by water to form the hydroxides.
$M_{2}O+H_{2}O\to 2M^{}+2O{H}^{-}{M}_2{O}_2+2H_{2}O\to 2M^{+}+2O{H}^{-}+H_2{O}_{2}M{O}_2+2H_{2}O\to 2M^{+}+2O{H}^{-}+H_2{O}_2+O_2$

1. The hydroxides are all white crystalline solids.
2. Alkali metal hydroxides are the strongest of all bases.
3. Dissolve freely in water with the evolution of much heat on account of intense hydration.