Name of the structure of silicates in which three oxygen atoms of [SiO₄]^4– are shared.

Pyrosilicate
Sheet silicate
Linear chain silicate
Three dimensional silicate

Solution

Two dimensional sheet structures of the formula \((SiO_{5})_{n}^{2n-}\) are formed when tetrahedral are shared.

Which one of the following is the correct statement?

Boric acid is a protonic acid
Beryllium exhibits coordination number of six
Chlorides of both beryllium and aluminium have bridged structures in solid phase
B₂H₆.2NH₃ is known as ‘inorganic benzene’

Solution

The structure of diborane (B₂H₆) contains

four 2c-2e bonds and four 3c-2e bonds
two 2c-2e bonds and two 3c-3e bonds
two 2c-2e bonds and four 3c-2e bonds
four 2c-2e bonds and two 3c-2e bonds

Solution

In silicon dioxide

there are double bonds between silicon and oxygen atoms
silicon atom is bonded to two oxygen atoms
each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms
each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.

Solution

Name the type of the structure of silicate in which one oxygen atom of [SiO₄]^4– is shared ?

Linear chain silicate
Sheet silicate
Pyrosilicate
Three dimensional

Solution

The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acid decreases in the sequence:

BCl₃ > BF₃ > BBr₃
BBr₃ > BCl₃ > BF₃
BBr₃ > BF₃ > BCl₃
BF₃ > BCl₃ > BBr₃

Solution

p-p overlap between B and F is maximum due to identical size and energy of p-orbitals, so electron deficiency in boron of BF₃ is neutralized partially to the maximum extent by back donation. Hence BF₃ is least acidic.As the size of halogen atom increases from F to I, the extent of overlap between 2 p-orbital of B and a bigger p-orbital of halogen decreases. Therefore the electron deficiency of B increases.

The straight chain polymer is formed by

hydrolysis of CH₃SiCl₃ followed by condensation polymerisation
hydrolysis of (CH₃)₄Si by addition polymerisation
hydrolysis of (CH₃)₂SiCl₂ followed by condensation polymerisation
hydrolysis of (CH₃)₃SiCl followed by condensation polymerisation

Solution

Al₂O₃ can be converted to anhydrous AlCl₃ by heating

Al₂O₃ with NaCl in solid state
a mixture of Al₂O₃ and carbon in dry Cl₂ gas
Al₂O₃ with Cl₂ gas
Al₂O₃ with HCl gas

Solution

Nitrolim is a mixture of

CaC₂ & Ga
CaCN₂ & C
Ca(CN)₂ & Ga
CaCN₂ & N₂

Solution

Nitrolim is a mixture of CaCN₂ and graphite (C) which is used as fertilizer.Option (b) is correct

Attempted

0

Correct

0

Wrong

0

Attempted

Wrong

Correct