14 th group elements (p-block) practice · Mixed difficulty

Which of the following is a three dimensional silicate?

Which of the following is a mixed oxide?

${CCl}_4$ is used as a fire extinguisher because of

Which element of group 14 forms only one hydride?

The acid used for etching the glass is:

Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of

The correct statement among the following

a) Fullerene has both single and double bonds

b) $C-C$ bond lengths in fullerene are 143.5 PM and 138.3 PM

c) Fullerene has one electron at each carbon which is delocalized into molecular orbitals

d) Fullerene is aromatic in nature.

Which gas is liberated when $\mathrm{A}{\mathrm{l}_4}{\mathrm{C}_3}$ is hydrolysed?

Statement (S): Band gap in germanium is small.

Explanation (E): The energy spread of each germanium atomic energy level is infinitesimally small.

Assertion (A) : ${PbCl}_2$ is more stable than ${PbCl}_4$.

Reason (R) : ${PbCl}_4$ is powerful oxidising agent.

The calorific value of carbon is about ……. kcal.

Which is pseudo solid?

Which of the following is not true for boron and aluminium?

Carborundum is the commercial name of :

Which of the following is correct:

A fibrous mineral which can withstand red hot flames without any damage is

Carbon dioxide dissolves under pressure in water to give:

Consider the equilibrium, $C(s) + {H_2}O(g)\underset{{}}{\overset{{}}{\leftrightharpoons}}CO(g) + {H_2}(g)$ Which of the following statements is true at equilibrium?

An aqueous solution of a substance gives a white precipitate on treatment with dil HCl, which dissolved on heating. On passing ${\mathrm{H}_2}\mathrm{S}$ in hot acidic solution a black precipitate is formed. The substance is:

With which of the following metals, $\mathrm{CO}$ forms a volatile carbonyl complex?

Choose the incorrect statement :

a. In diamond each c-atom undergoes $\mathrm{s p}^3$ hybridisation.

b. In graphite each layer is composed of planer hexagonal rings with $\mathrm{s p}^3$ hybridized $\mathrm{c}$-atom

c. Fullerenes are made by heating of graphite in an electric arc in presence of inert gases.

d. Max. percentage of carbon is present in anthracite between diffrent form of coal.

On strong heating lead nitrate gives:

Diamond and graphite both are made of carbon atoms. Diamond is extremely hard whereas graphite is soft. This is because :

The refractive index of diamond is highest among solids. Its value is:

(A): ${CO}_2$ and ${SiO}_2$ have same physical state at room temperature.

(R): ${CO}_2$ does not contains ${C}={O}$ bonds, ${SiO}_2$ does not contain ${Si}={O}$ bonds.

Feldspar is:

In petrochemical industry, alcohols are directly converted to gasoline by passing over heated

Lewis acids among the following are
$\begin{array}{cccccccccccccccccccc} {\left( {\text{a}} \right)\,\,CC{l_4}}&{\left( {\text{b}} \right)\,\,SiC{l_4}}&{\left( {\text{c}} \right)\,\,Ge{F_4}} \end{array}$

Carbon dioxide turns:

An insulator is: