P-block elements practice · Medium

Which ion will not be precipitated by aq. $\left({NH}_4\right)_2 {S}$ ?

Liquid ammonia is used in refrigeration because of its

Assertion (A) : $\mathrm{XeF}_6$ can be used as an oxidising agent.

Reason (R) : Oxidation state of $\mathrm{Xe}_{\mathrm{e}}$ in $\mathrm{XeF}_6$ is ${+ 6}$.

An element $M$ belongs to group- 15 and it occurs as the founder of the apatite family. It is an essential constituent of animal and plant matter. It is also present in bones as well as in living cells. Identify $M$.

Assertion (A): To initiate the reaction between $\mathrm{O}_2$ and a metal, some external heating is required.

Reason (R): Bond dissociation enthalpy of $\mathrm{O}=\mathrm{O}$ bond is high $\left(493.4 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)$.

Which of the following will show disproportionation reaction?

A chloride salt solution acidified with dil. $\mathrm{HNO}_{3}$ gives a curdy white precipitate, [A], on addition of $\mathrm{AgNO}_{3}$. [A] on treatment with $\mathrm{NH}_{4} \mathrm{OH}$ gives a clear solution, B. A and B are respectively

In the laboratory ${H_2}S$ gas is prepared by using black lumps and dil. ${H_2}S{O_4}$ The black lumps are

Statement-I: There are two types of ${Cl}-{P}-{Cl}$ bond angles of $90^{\circ}$ and $120^{\circ}$ and two types of ${P}-{Cl}$ single bonds, two weaker than the rest three bonds is ${PCl}_5$ molecule.

Statement-II: ${P}$ in ${PCl}_s$ is ${sp}^3 {d}-$hybridized giving trigonal bipyramid geometry where two ${P}-{Cl}$ axial bonds are longer and weaker than the three equatorial bonds.

Which of the following compound have maximum oxidising nature?

Chlorine bleaches only in the:

The non-metal other than graphite having metallic lustre is:

Statement I: Elemental $P$ is much more reactive than elemental nitrogen

Statement II: In $\mathrm{P}_4$, all P-P bonds are single covalent bonds while in $\mathrm{N}_2$ there is a triple bond between nitrogen atoms

S-I: In metal halides, metal in its higher oxidation state will be more covalent then the one in lower oxidation state.

S-II: ${BrF}_5$ is colour less liquid.

The weakest acid among the following is:

Which of the following bonds will be most polar?

When ${H_2}S$ reacts with halogens,halogens:

At T (K), 100 L of dry oxygen is present in a sealed container. It is subjeceted to silent electric discharge, till the volumes of oxygen and ozone becomes equal .what is the volume of ozone formed at T (K)?

Which of the following is a disproportionation reaction?

Brown colour acidic oxide among the following is

With which of the following metal dil. ${HNO}_3$ produces nitrous oxide?

Assertion: Pure $N_2$ is obtained from $Ba\left(N_3\right)_2$ but not from $\left(NH_4\right)_2 Cr_2 O_7$

Reason: On decomposition $\left(NH_4\right)_2 Cr_2 O_7$ gives $O_2$ gas.

Dinitrogen pentoxide a colourless solid is prepared by

Which of the following statement is true?

Given below are two statements:
Statement I : The boiling points of the following hydrides of group 16 elements increases in the order
${H_2}O < {H_2}S < {H_2}Se < {H_2}Te$
Statement II : The boiling points of these hydrides increase with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:

Assertion (A): Deep sea divers use helium & oxygen mixture for respiration.

Reason (R): Helium is inert in nature.

${MF}+{XeF}_4 \rightarrow {A}^{\prime}\left({M}^{+}=\right.$Alkalimetalcation $)$
The state of hybridisation of the central atom in '$A$' and shape of the species are:

Which of the following solutions does not change its colour on passing ozone through it?

Assertion (A) : The reaction $\mathrm{XeO}_3+6 \mathrm{H}^{+}+6 e^{-} \rightleftharpoons \mathrm{Xe}+3 \mathrm{H}_2 \mathrm{O}, E^{\circ}=2.1 \mathrm{~V}$ is not feasible thermodynamically to oxidise $\mathrm{H}_2 \mathrm{O}$

Reason (R) : There is a high activation energy barrier between oxidation state +6 and 0 of $\mathrm{Xe}$.

Which of the following cannot as an oxidising agent?