When \( \mathrm{MnO_2} \) and \( \mathrm{H_2SO_4} \) is added to a salt (A), the greenish yellow gas liberated as salt (A) is:
\( \mathrm{CaI_2} \)
\( \mathrm{NH_4Cl} \)
\( \mathrm{KNO_3} \)
\( \mathrm{NaBr} \)
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : \( \mathrm{PH_3} \) has lower boiling point the \( \mathrm{NH_3} \).Reason (R) : In liquid state \( \mathrm{NH_3} \) molecules are associated through vander Waal's forces, but \( \mathrm{PH_3} \) molecules are associated through hydrogen bonding.In the light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements:Statement (I): \( \mathrm{SiO_{2}} \) and \( \mathrm{GeO_{2}} \) are acidic while \( \mathrm{SnO} \) and \( \mathrm{PbO} \) are amphoteric in nature.Statement (II): Allotropic forms of carbon are due to property of catenation and \( p\pi - d\pi \) bond formation.In the light of the above statements, choose the most appropriate answer from the options given below:
The strongest reducing agent among the following is:
\( 1 \) mole of \( \mathrm{PbS} \) is oxidized by “\( X \)” moles of \( \mathrm{O_3} \) to get “\( Y \)” moles of \( \mathrm{O_2} \). \( X + Y = \) __________.
Reduction potential of ion are given below:\( \mathrm{ClO_4^-} \) \( \mathrm{IO_4^-} \) \( \mathrm{BrO_4^-} \)\(E^\circ = 1.19 \ \mathrm{V} \) \(E^\circ = 1.65 \ \mathrm{V} \) \(E^\circ = 1.74 \ \mathrm{V} \)The correct order of their oxidizing power is:
The number of ions from the following that are expected to behave as oxidizing agent is:\( \mathrm{Sn}^{4+}, \mathrm{Sn}^{2+}, \mathrm{Pb}^{2+}, \mathrm{Tl}^{3+}, \mathrm{Pb}^{4+}, \mathrm{Tl}^{+} \)
