P-block elements practice · Mixed difficulty

Which one of the following reacts with glass?

Ordinary oxygen contains:

A gas does not turn lime water milky, supports the combustion of burning magnesium. It has no smell and is colourless. It extinguishes a glowing splint but under some circumstances reacts with oxygen and hydrogen. It is not poisonous. The gas is likely to be :

Which of the following is INCORRECT?

Concentrated nitric acid on heating decomposes to give:

Assertion (A) : In aqueous solution, $\mathrm{SO}_2$ reacts with $\mathrm{H}_2 \mathrm{S}$ forming sulphur.

Reason (R): $\mathrm{SO}_2$ is an effective reducing agent.

The function of $Fe{\left( {OH} \right)_3}$ in the contact process is

Assertion: $\mathrm{H}_2 \mathrm{O}$ is a liquid while $\mathrm{H}_2 \mathrm{~S}$ is a gas

Reason: There is stronger intermolecular hydrogen bonding in $\mathrm{H}_2 \mathrm{~S}$.

In Birkeland and Eyde process, the temperature of the electric arc is about:

Oleum is

Assertion: Fluorine oxidises $\mathrm{H}_2 \mathrm{O}$ to $\mathrm{O}_2$ but $\mathrm{Cl}_2$ does not.

Reason: Electronegativity of fluorine is greater than oxygen but EN of chlorine is lesser than oxygen.

Noble gases are:

Assertion (A) : Structure of $\mathrm{SO}_4^{2-}$ is identical for $\mathrm{S}_2 \mathrm{O}_3^{2-}$.

Reason (R) : Sulphur atoms in $\mathrm{S}_2 \mathrm{O}_3^{2-}$ are in different oxidation states.

Antimony dissolves in aquaregia to give:

Assertion (A): ${NO}_3^{-}$ is planar while ${NH}_3$ is pyramidal.

Reason (R): ${N}$ in ${NO}_3^{-}$ is ${sp}^2$ hybridized but in ${NH}_3$ it is ${sp}^3$-hybridized.

Assertion (A): As to $\mathrm{Bi}$, there is only a small increase in covalent radius.

Reason (R): $d$ and/or $f$-orbitals are completely filled in heavier elements.

On passing ammonia gas through a reagent ' $x$ ', brown precipitate is observed that confirms the presence of $\mathrm{NH}_4^{+}$ion. The reagent ' $\mathrm{x}$ ' is:

The compound is used in the estimation of carbon monoxide. Here, $A$ refers to

Which of the following statements regarding properties of halogens are correct?

(i) Due to small size electron gain enthalpy of fluorine is less than that of chlorine.

(ii) Iodine has same physical state but different colour as compare to other members of the group.

(iii) Fluorine shows no positive oxidation state.

(iv) In $X_2(g)+H_2O(l) \to HX (aq) + HOX (aq)$

(where $X_2=Cl$ or $Br)$

(v) $F_2$ is the strongest oxidising halogen.

Which one is most stable to heat -

Statement I: The coordination number of ' $N$ ' is seldom, if ever 5 where as that of $P$, which is in the same group, is 5 in a large number of compounds

Statement II: The first IE of nitrogen is more than that of $\mathrm{P}$

Ammonium salts are oxidized in the soil to nitrites by:

In the reaction, $X + I_2 + 2HCl \to {SnCl}_4 + 2HI$

The correct option regarding $X$ is/are

The noble gases are unreactive because they:

An inorganic salt (A) is decomposed on heating to give two products (B) and (C). Compound (C) is a liquid at room temperature and is neutral to litmus while the compound (B) is a colourless neutral gas. Compounds (A), (B) and (C) are

Thermally most stable compound is

First compound of intert gases was prepared by scientist Neil Barthleta in 1962. This compound is

Which one is not an acid salt?

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

$\mathrm{NH}_3 < \mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{SbH}_3 < \mathrm{BiH}_3$

Choose the most appropriate from the option given below

Bone black is polymorphic form of