JEE Main pBlock Elements Practice Questions With Solutions

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

Assertion (A) : Both rhombic and monoclinic sulphur exist as ${\mathrm{S}}_8$S_{8} while oxygen exists as ${\mathrm{O}}_2$O_{2}.

Reason (R) : Oxygen forms $p\pi -p\pi$p \pi - p \pi multiple bonds with itself and other elements having small size and high electronegativity like $\mathrm{C},\mathrm{N}$C , N, which is not possible for sulphur.

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

On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed?

Identify the correct statements about p-block elements and their compounds.

(A) Non metals have higher electronegativity than metals.

(B) Non metals have lower ionisation enthalpy than metals.

(C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic.

(D) The non-metal oxides are generally basic in nature.

(E) The metal oxides are generally acidic or neutral in nature.

Choose the correct answer from the options given below :

Identify the incorrect statements about group 15 elements :

(A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.

(B) The common oxidation states of these elements are $-3,+3$- 3 , + 3 and +5.

(C) Nitrogen has unique ability to form $\mathrm{p}\pi -\mathrm{p}\pi$p \pi - p \pi multiple bonds.

(D) The stability of +5 oxidation states increases down the group.

(E) Nitrogen shows a maximum covalency of 6.

Choose the correct answer from the options given below :

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The stability order of +1 oxidation state of $\mathrm{Ga}$Ga, In and $\mathrm{Tl}$Tl is Ga < In < Tl.

Reason R: The inert pair effect stabilizes the lower oxidation state down the group.

In the light of the above statements, choose the correct answer from the options given below:

Among the following halogens

${\mathrm{F}}_2,{\mathrm{Cl}}_2,{\mathrm{Br}}_2\text{ and }{\mathrm{I}}_2$F_{2} , Cl_{2} , Br_{2} \textrm{ }\text{and}\textrm{ } I_{2}

Which can undergo disproportionation reactions?

Evaluate the following statements related to group 14 elements for their correctness.

(A) Covalent radius decreases down the group from $\mathrm{C}$C to $\mathrm{Pb}$Pb in a regular manner.

(B) Electronegativity decreases from $\mathrm{C}$C to $\mathrm{Pb}$Pb down the group gradually.

(C) Maximum covalance of $\mathrm{C}$C is 4 whereas other elements can expand their covalance due to presence of d orbitals.

(D) Heavier elements do not form $\mathrm{p}\pi -\mathrm{p}\pi$p \pi - p \pi bonds.

(E) Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : Gallium is used in the manufacturing of thermometers.

Statement II : A thermometer containing gallium is useful for measuring the freezing point $(256\mathrm{K})$\left(\right. 256 \textrm{ } K \left.\right) of brine solution.

In the light of the above statements, choose the correct answer from the options given below :

Which of the following material is not a semiconductor.