On hydrolysis, PCl₃ gives________.

P₄O₆ reacts with cold water to give _______.

Among the following, which is the strongest oxidizing agent?

Which is dibasic?

S-S bond is present in _______.

Chalcogens belongs to p-block. Give reason.

Give the uses of helium.

What is the hybridisation of iodine in IF₇? Give its structure.

Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

Although \(\triangle\)H of fluorine is less negative than that of chlorine, but fluorine is a stronger oxidising agent than chlorine, why?

Give the uses of sulphuric acid.

Write the reason for the anomalous behaviour of Nitrogen.

Write the valence shell electronic configuration of group-15 elements.

Explain the commercial method of preparation of nitric acid.

Name a reaction for the estimation of Ozone.

What happens when PCl₅ is heated?

Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

What type of hybridisation occur in
a) BrF₅
b) BrF₃

An amorphous solid (A) burns in air to form a gas (B) which turns lime water milky. The gas is also produced as a byproduct during roasting of sulphide ore. This gas decolourises acidified aqueous KMnO₄ solution and reduces Fe³⁺ to Fe²⁺. Identify the solid 'A' and the gas 'B' and write the reactions involved.