BCECE Question Paper

Hello sir, I am Rishabh Mehta. I am from Patna. I want you to help me by rpoviidng me with the Bihar Combined Entrance Competitive Examination (BCECE) Chemistry Sample question paper. Can you help me?

[Shaleen]

As you have asked about the Bihar Combined Entrance Competitive Examination (BCECE) Chemistry Sample question paper, check below for the information
1. Which one of the following is the correct statement?

i. Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase.

ii. B2H6.2NH3 is known as 'inorganic benzene'.

iii. Boric acid is a protonic acid.

iv. Beryllium exhibits coordination number of six.

Sol: Becl2 and Alcl3 both have bridged structure in solid phase.

B3N3 H6 is known as inorganic benzene.

Boric acid is Lewis acid.

Beryllium exhibits coordination number of 4

The pKa of a weak acid, HA is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of

the corresponding salt, BA, will be

i. 7.01

ii. 9.22

iii. 9.58

iv. 4.79

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the

presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

i. reduces permanganate to Mn2+.

ii. oxidises oxalic acid to carbon dioxide and water.

iii. gets oxidised by oxalic acid to chlorine.

iv. furnishes H+

Sol: KMnO4can oxidise HCl along with oxalic acid into Cl2 and itself gets reduced to Mn2+.

ions in addition to those from oxalic acid.
For more, you can refer to the attached file