Question

answer fast and give reason​

Answer 1

Hello there!

Answer:

C. CaO and Ca(OH)2

Explanation:

The valency of Ca is given as 2, and that of Oxygen (O) is 2 as well, and the radical hydroxide (OH) has valency 1.

So the formation of calcium oxide is given as

Ca O

2 2

this gives Ca2O2, but since 2 can be cancelled on both elements, we get CaO

Similarly, calcium hydroxide is given as

Ca OH

2 1

this gives Ca(OH)2, and nothing can be cancelled here since 2 and 1 aren't divisible.

The law of constant proportions is used here.

Hope it helps you!

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