P-block elements practice · Medium

Assertion: Group 15 elements are less reactive than Group 16 elements.
Reason: Group 15 elements have a higher ionization energy and a lower electronegativity than Group 16 elements.

Which of the following(s) when heated give nitrogen gas?

Which of the following statements is wrong?

The substance which does not liberate oxygen on treatment with ozone is

Assertion (A): Noble gases have very high boiling point.
Reason (R): Noble gases have strong dispersion forces hence they liquify at low temperature, hence they have high boiling point.

Consider $N{H_3},\,\,P{H_3},\,\,As{H_3}\,\,\& \,\,Sb{H_3}$ find which statements are correct for $N{H_3}$
A) Most basic
B) Highest bond angle
C) Strongest Reducing agent
D) Highest B.P.
E) Most $- ve\,\Delta H_f^0$

Assertion (A): $\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7,$ on heating doesn't form any residue.

Reason (R): In $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$ there are six equivalent $\mathrm{Cr}-\mathrm{O}$ bonds.

${KF}$ combines with ${HF}$ to form ${KHF}_2$. The compound contains the species:

The hydrides of the first elements in groups 15-17 namely $\mathrm{NH}_3, \mathrm{H}_2 \mathrm{O}$ and $\mathrm{HF}$ respectively shows abnormally high values for melting and boiling points. This is due to

Which of the following acid posses oxidising, reducing and complex forming properties?

The products obtained when $\mathrm{I}_2$ reacts with hot and concentrated aqueous $\mathrm{NaOH}$ are

Hydrolysis of ‘$X$’ is an example of disproportionation. $X$ is

Which one of the following correctly represents the order of stability of oxides, ${X_2}O$ (X = halogen)?

Which of the following is a double base propellant?

Which statement is not correct?

The spectrum of helium is similar to:

Statement I: $\mathrm{PF}_5$ and IF have similar shapes

Statement II: $\mathrm{PF}_5$ has to two types of $\mathrm{P}-\mathrm{F}$ bond lengths

Weldon mud is:

Oxidation states of ${P}$ in ${H}_4 {P}_2 {O}_5, {H}_4 {P}_2 {O}_6, {H}_4 {P}_2 {O}_7$ are respectively

$\left[{Fe}\left({H}_2 {O}\right)_5 {NO}\right]^{2+}$ is a complex formed during the brown ring test for ${NO}_3^{-}$ion. In this complex.

Assertion (A) Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black.

Reason (R) Of the three forms, white phosphorus is the most important and most reactive.

Statement I: The dipole moment of $\mathrm{NF}_3$ is less than $\mathrm{NH}_3$

Statement II: The presence of lone pair of electrons on nitrogen atom shows an additive contribution in dipole moment of $\mathrm{NH}_3$ whereas it shows negative contribution towards dipole moment of $\mathrm{NF}_3$

What is the oxidising agent chlorine water?

Iodine exists in which form in iodised salt

Hydrolysis of ${PCl}_5$ gives:

In a reaction, 4 mole of electrons are transferred to 1 mole of ${HNO}_3$, the possible product obtained due to reduction is :-

The stability of +2 oxidation state among Si, Ge, Sn and Pb increase in the sequence

Which is bad conductor of electricity?

Statement I: All the halogens exhibit -1 oxidation state.

Statement II: The oxidation states of +4 and +6 occur in the oxides and oxoacids of chlorine and bromine.

Hot conc. ${H_2}S{O_4}$ act as moderately strong oxidizing agent. It oxidises both metals and non-metals. Which of the following element is oxidized by conc. ${H_2}S{O_4}$ into two gaseous products.