The p-Block Elements

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: Boric acid is a weak acid.

Reason R: Boric acid is not able to release H⁺ ion on its own. It receives OH^- ion form water and releases H⁺ ion.

In the light of the above statements, choose the most appropriate answer form the option given below.

Concentrated HNO₃ reacts with Iodine to give

White phosphorus reacts with thionyl chloride to give

A 2.0g sample containing MnO₂ is treated with HCl liberating Cl₂. The Cl₂ gas is passed into a solution of Kl and 60.0mL of 0.1M Na₂S₂O₃ is required to titrate the liberated iodine. The percentage of MnO₂ in the sample is_______. (Nearest integer)

[Atomic masses (in u) Mn = 55; Cl = 35.5; O = 16, I = 127, Na = 23, K = 39, S = 32]

Which one of the following structures are aromatic in nature?

Given below are two statements:

Statement I : The pentavalent oxide of group-15 element, E₂O₅, is less acidic than trivalent oxide, E₂O₃, of the same element.

Statement II : The acidic character of trivalent oxide of group 15 elements, E₂O₃ decreases down the group.

In light of the above statements, choose most appropriate answer form the options given below

Nitrogen gas is obtained by thermal decomposition of

If the solubility product of PbS is 8 * 10^-28, then the solubility of PbS in pure water at 298 K is $x*10^{-16}mol{L}^{-1}.$  The value of x is__________. (Nearest integer)

[Given: $\sqrt[]{2}=1.41]$  

Given below are two statements: one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: Flourine forms one oxoacid.

Reason R: Flourine has smallest size amongst all halogens and is highly electronegative.

In the light of the above statements, choose the most appropriate answer from the options given below.

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitride is