HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions for Chemistry

Why does the cell potential of mercury cell remain constant throughout its life?

Define the following terms: Molar conductivity (⋀_m)

Define the following terms: Secondary batteries

On passing 1.5 F charge, the number of moles of aluminium deposited at cathode are _______ [Molar mass of Al = 27 gram mol^–1]

(A) 1.0

(B) 13.5

(C) 0.50

(D) 0.75

Write any two uses of H₂SO₄

10.0 grams of caustic soda when dissolved in 250 cm³ of water, the resultant gram molarity of solution is _______.

(A) 0.25 M

(B) 0.5 M

(C) 1.0 M

(D) 0.1 M

Construct a labelled diagram for the following cell:

`Zn|Zn^(2+)(1M)||H^+(1M)|H_(2(g,1atm))|Pt`

Write any ‘two’ advantages of calomel electrode.

Potential of saturated calomel electrode is-

Draw neat labelled diagram of electrolytic refining of blister copper

The conductivity of 0.02 M AgNO₃ at 25°C is 2.428 × 10⁻³ Ω⁻¹ cm⁻¹. What is its molar conductivity?

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

Explain Faraday’s second law of electrolysis

Define entropy.

Write electrode reaction and net cell reaction for fuel cell. Calculate e.m.f. of the following cell at 25 °C.

Standard reduction potential (SRP) of Zn and Cu are − 0.76 V and 0.334 V respectively

Write mathematical expression of molar conductivity of the given solution at infinite dilution.

Write cathode and anode reaction in a fuel cell.

In the hydrogen-oxygen fuel cell, the carbon rods are immersed in the hot aqueous solution of __

(a) KCl

(b) KOH

(c) H₂SO₄

(d) NH₄Cl

How many faradays of electricity are required to produce 13 gram of aluminium from aluminium chloride solution? (Given: Molar mass of Al = 27.0-gram mol^–1)

Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol^-1.

(Given: R = 8.314 J K^-1 mol^-1)