HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

What is the ratio of volumes of H2 and O2 liberated during electrolysis of acidified water?

(A) 1 : 2

(B) 2 : 1

(C) 1 : 8

(D) 8 : 1

Calculate molarity and molality of 6.3% solution of nitric acid having density 1.04 g cm⁻³
. (H = 1, N = 14, O = 16)

What is the action of chlorine (Cl) on the following:

Cold and dilute caustic soda

What is the action of chlorine (Cl) on the following:

Hot and concentrated caustic soda

What is the action of chlorine (Cl) on the following:

Potassium bromide solution

Calculate the number of atoms present in 2 gram of crystal which has face-centred cubic
(FCC) crystal lattice having edge length of 100 pm and density 10 gcm−3

NF₃ is possible, but NF₅ is not. Why?

State second law of electrolysis

Explain Faraday’s second law of electrolysis

Derive the relation ∆H − ∆U = ∆nRT.

Draw a neat, well labelled diagram of electrolytic cell for extraction of aluminium

What is the action of Zn – Hg / conc. HCl on propanone?

What is the action of Sodium bisulphite on propanone?

Calculate EAN of cobalt (Z=27) in [CO(NH₃)₆]⁺³ and of zinc (Z=30) in [Zn(NH₃)₄]SO₄.

What is the action of hot/concentrated nitric acid on - Antimony.

Arrange the following oxyacids of chlorine - HClO, HClO₂, HClO₃, and HClO₄ with respect to increasing order of oxidizing power.

Calculate the effective atomic number of the central metal atom in the following  compounds:

Cr(CO)₆ Cr(Z=24)

Write any two uses of Chlorine.

Write cathode and anode reaction in a fuel cell.

An ionic crystal lattice has `r^+/r` radius ratio of 0.320, its coordination number is __

(a) 3

(b) 4

(c) 6

(d) 8