Question

A salt of an element of 1st group gives lilac violet coloration to the flame. The element reacts with excess of air to predominantly form yellow orange coloured compound (P). Select the correct statement(s).
*Element may be potassium
*Element may be lithium
*Compound P on hydrolysis form different compounds in which oxidation number of oxygen are –1, 0 and –2
*P on hydrolysis produces different products in which oxidation state of oxygen is only –2

Answer 1

Answer:

Element A is sodium metal(Na) as it burns with a golden flame.

Element B with atomic number 17 is chlorine (Cl).

Sodium and chlorine combine to form sodium chloride, NaCl(compound C).

The reaction can be written as:

2Na+Cl

2

→2NaCl

Aqueous solution of NaCl on electrolysis gives the compound D, sodium hydroxide(NaOH). The equation for this can be written as:

2NaCl(aq)+2H

2

O(l)→2NaOH(aq)+Cl

2

(g)+H

2

(g)

Answer 2

Answer:

ans is potassium the salt is KCl