Which of the following statement is correct for oleum?

Which of the following inert gas participate in chemical reaction?

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

Which of the following oxyacid does not contain $$\mathrm{P}-\mathrm{O}-\mathrm{P}$$ bond?

$$\mathop {8N{H_3}}\limits_{(Excess)} + 3C{l_2}\buildrel {} \over \longrightarrow X$$

$$N{H_3} + \mathop {3C{l_2}}\limits_{(Excess)} \buildrel {} \over \longrightarrow Y$$

What is X and Y in the above reaction?

Which of the following products will be obtained when copper metal is reacted with $$\mathrm{HNO}_3$$ ?

A green yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fireworks and safety matches. The gas and halate are, respectively

Assertion (A) $$\mathrm{N}_2$$ is less reactive than $$\mathrm{P}_4$$.

Reason (R) Nitrogen has more electron gain enthalpy than phosphorus.

Assertion (A) $$\mathrm{NaCl}$$ reacts with concentrated $$\mathrm{H}_2 \mathrm{SO}_4$$ to give colourless fumes with pungent smell. But on adding $$\mathrm{MnO}_2$$ the fumes become greenish yellow.

Reason (R) $$\mathrm{MnO}_2$$ oxidises $$\mathrm{HCl}$$ to chlorine gas which is greenish yellow.