p-Block Elements

Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

When borax is heated with \(\mathrm{CoO}\) on a platinum loop, blue coloured bead formed is largely due to :

Given below are two statements.
Statement I : Stannane is an example of a molecular hydride.
Statement II : Stannane is a planar molecule.
In the light of the above statement, choose the most appropriate answer from the options given below.

In liquation process used for tin (Sn), the metal :

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, E2O...

Nitrogen gas is obtained by thermal decomposition of :

Which of the following oxoacids of sulphur contains "S" in two different oxidation states?

Among the given oxides of nitrogen ; N2O, N2O3, N2O4 and N2O5, the number of compound/(s) having N - N bond is :

Dinitrogen and dioxygen, the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because :

Concentrated \(\mathrm{HNO}_{3}\) reacts with Iodine to give :

White phosphorus reacts with thionyl chloride to give :

Heating white phosphorus with conc. NaOH solution gives mainly :

Match List - I with List - II.

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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Fluorine forms one oxoacid.
Reason R : Fluorine has smallest size amongst all halogens and is highly electronegative.
In th...

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

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

Given below are two statements.
Statement I: The chlorides of \(\mathrm{Be}\) and \(\mathrm{Al}\) have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.
Statement II: Hydroxides of \(\mathrm{Be}\) and $$\mat...

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4.
Reason R : Gases with lower critical temperatures are readily adso...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Boron is unable to form \(\mathrm{BF}_{6}^{3-}\).
Reason (R) : Size of B is very small.
In the light of the above sta...

Consider the following reaction :
A + alkali \(\to\) B (Major Product)
If B is an oxoacid of phosphorus with no P-H bond, then A is :

The correct order of melting points of hydrides of group 16 elements is :

Choose the correct stability order of group 13 elements in their + 1 oxidation state :

The oxide which contains an odd electron at the nitrogen atom is :

Which of the following elements is considered as a metalloid?

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "\(X\)" with 6-equivalents of "\(Y\)". "\(X\)" and "\(Y\)", respectively are :

Match List - I with List - II.

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The number of non-ionisable protons present in the product B obtained from the following reactions is ___________.
$$
\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}+\mathrm{PCl}_{3} \rightarrow \mathrm{C}_{2} {\mathrm{H}_{5} \mathrm{Cl}+\mathrm{...

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion : Boric acid is a weak acid.
Reason R : Boric acid is not able to release \(\mathrm{H}^{+}\) ion on its own. It receives $$\mat...

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of :

Consider the following reactions:
PCl3 + H2O \(\to\) A + HCl
A + H2O \(\to\) B + HCl
The number of ionisable protons present in the product B is _______________.

The number of bridged oxygen atoms present in compound B formed from the following reactions is
Pb(NO3)2 \(\buildrel {673\,K} \over \longrightarrow\) A + PbO + O2
A \(\buildrel {Dimerise} \over \longrightarrow\) B

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

The geometry around boron in the product 'B' formed from the following reaction is
$$
\begin{aligned}
&\mathrm{BF}_{3}+\mathrm{NaH} \stackrel{450 \mathrm{~K}}{\rightarrow} \mathrm{A}+\mathrm{NaF} \\\\
&\mathrm{A}+\mathrm{NMe}_{3} \rightarro...

Match List I with List II

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...

Match List I with List II:

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The total number of acidic oxides from the following list is
NO, N2O, B2O3, N2O5, CO, SO3, P4O10

Which one of the following elemental forms is not present in the enamel of the teeth?

The most stable trihalide of nitrogen is :

Identify the correct statement for B2H6 from those given below :
(A) In B2H6, all B-H bonds are equivalent.
(B) In B2H6, there are four 3-centre-2-electron bonds.
(C) B2H6 is a Lewis acid.
(D) B2H6 can be synthesized from both BF3 and NaBH...

PCl5 is well known, but NCl5 is not. because,

The number of halogen/(s) forming halic (V) acid is ___________.

Consider the sulphides HgS, PbS, CuS, Sb2S3, As2S3 and CdS. Number of these sulphides soluble in 50% HNO3 is ___________.

The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

Which one of the following correctly represents the order of stability of oxides, X2O; (X = halogen)?

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :

Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are :

Match List - I with List - II :
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Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : SO2(g) is absorbed to a large extent than H2(g) on activated charcoal.Reason R : SO2(g) has a higher critical temperature t...

In polythionic acid, H2SxO6 (x = 3 to 5) the oxidation state(s) of sulphur is/are :

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?