When Mg is burnt in the atmosphere of an element X white powder is obtained.When this is dissolved in water it gives a compoundY with pungent smell.What are X and Y?

Options

A. `C, CH_4`
B. `N_2,NH_3`
C. `P,PH_3`
D. `S,H_2S`

Explanation

To solve the question step by step, we need to identify the elements X and Y based on the information provided.

### Step 1: Identify the element X
- The question states that magnesium (Mg) is burnt in the atmosphere of an element X, resulting in a white powder.
- Magnesium reacts with nitrogen (N2) to form magnesium nitride (Mg3N2), which is a white powder.

**Hint:** Think about common elements that can react with magnesium to form a white powder.

...