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Among the following halogens.
\( \mathrm{F_2}, \mathrm{Cl_2}, \mathrm{Br_2} \) and \( \mathrm{I_2} \)
Which can undergo disproportionation reactions?

Match List I with List II

List-I	List-II
(A) Melting Point [K]	I.) Tl > In > Ga > Al > B
(B) Ionic Radius [M³⁺/pm]	II.) B > Tl > Al ≈ Ga > In
(C) \(Δ_iH_1\) [kJ mol^-1]	III.) Tl > In > Al > Ga > B
(D) Atomic Radius [pm]	IV.) B > Al > Tl > In > Ga

Choose the correct answer from the options given below:

Aluminium chloride in acidified aqueous solution forms an ion having geometry.

Consider the oxides of group \( 14 \) elements
\( \mathrm{SiO_2} \), \( \mathrm{GeO_2} \), \( \mathrm{SnO_2} \), \( \mathrm{PbO_2} \), \( \mathrm{CO} \) and \( \mathrm{GeO} \). The amphoteric oxides are:

The \( \mathrm{F^-} \) ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Melting point of Boron \( (2453 \, \text{K}) \) is unusually high in group \( 13 \) elements.
Reason (R): Solid Boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below :

Identify the correct statements about p-block elements and their compounds.
(A) Non metals have higher electronegativity then metals.
(B) Non metals have lower ionization enthalpy than metals.
(C) Compounds formed between highly reactive non-metals 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 option given below:

Choose the correct statements about the hydrides of group \( 15 \) elements.
A. The stability of the hydrides decreases in the order \( \mathrm{NH_3} > \mathrm{PH_3} > \mathrm{AsH_3} > \mathrm{SbH_3} > \mathrm{BiH_3} \).
B. The reducing ability of the hydride increases in the order \( \mathrm{NH_3} < \mathrm{PH_3} < \mathrm{AsH_3} < \mathrm{SbH_3} < \mathrm{BiH_3} \).
C. Among the hydrides, \( \mathrm{NH_3} \) is strong reducing agent while \( \mathrm{BiH_3} \) is mild reducing agent.
D. The basicity of the hydrides increases in the order \( \mathrm{NH_3} < \mathrm{PH_3} < \mathrm{AsH_3} < \mathrm{SbH_3} < \mathrm{BiH_3} \).

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 Ga, In and Tl is \( \mathrm{Ga} < \mathrm{In} < \mathrm{Tl} \).
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:

10.

Anomalous behavior of oxygen is clue to its:

11.

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 \( -3, +3 \) and \( +5 \).
(C) Nitrogen has unique ability to form \( p\pi - p\pi \) multiple bonds.
(D) The stability of \( +5 \) oxidation states increases down the group.
(E) Nitrogen shows a maximum covalency of \( 6 \).

12.

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 \( \text{S}_8 \) while oxygen exists as \( \text{O}_2 \).
Reason (R): Oxygen forms \(p\pi - p\pi \) multiple bonds with itself and other elements having small size and high electronegativity like 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:

13.

Give below are two statements:
Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.
Statement II : Copper can not liberate hydrogen from weak acids.
In the light of the above statements, choose the correct answer from the options given below:

14.

The number of neutrons present in the more abundant isotope of boron is ‘\( x \)’. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ‘\( y \)’. The value of \( x + y \) is ______________.

15.

Given below are two statements:
Statement I : The electronegativity of group \( 14 \) elements from \( \mathrm{Si} \) to \( \mathrm{Pb} \), gradually decreases.
Statement II : Group \( 14 \) contains non-metallic, metallic, as well as metalloid elements.
In the light of the above statements, choose the most appropriate from the options given below:

16.

Choose the correct statement from the following.
A All group \( 16 \) elements form oxides of general formula \( \mathrm{EO_2} \) and \( \mathrm{EO_3} \) where \( \mathrm{E = S,\; Se,\; Te\; and\; Po} \). Both the types of oxides are acidic in nature.
B \( \mathrm{TeO_2} \) is an oxidising agent while \( \mathrm{SO_2} \) is reducing in nature.
C The reducing property decreases from \( \mathrm{H_2S} \) to \( \mathrm{H_2Te} \) down the group.
D The ozone molecule contains five lone pairs of electrons.
Choose the correct answer from the option given below:

17.

Evaluate the following statements related to group \( 14 \) elements for their correctness.
(A) Covalent radius decreases down the group from C to Pb in a regular manner.
(B) Electronegativity decreases from C to Pb down the group gradually.
(C) Maximum covalence of C is \( 4 \) whereas other elements can expand their covalence due to presence of d orbitals.
(D) Heavier elements do not form \( p\pi - p\pi \) bonds.
(E) Carbon can exhibit negative oxidation states.
Choose the correct answer from the options given below:

18.

Given below are two statements:
Statement I: Group \( 13 \) trivalent halides get easily hydrolyzed by water due to their covalent nature.
Statement II: \( \mathrm{AlCl_3} \) upon hydrolysis in acidified aqueous solution forms octahedral \( [\mathrm{Al(H_2O)_6}]^{3+} \) ion.
In the light of the above statements, choose the correct answer from the option below:

19.

Consider the following reactions
\(\text{NiS} + \text{HNO}_3 + \text{HCl} \rightarrow \text{A} + \text{NO} + \text{S} + \text{H}_2\text{O}\)

The number of protons that do not involve in hydrogen bonding in the product B is ______.

20.

Given below are two statements:
Statement I: Fluorine has most negative electron gain enthalpy in its group.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below:

21.

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is __________. B, C, N, S, O, F, P, Al, Si

22.

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 \( (256 \, \mathrm{K}) \) of brine solution.
In the light of the above statements, choose the correct answer from the options given below:

23.

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

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