Subject

Chemistry

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

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1.

Define activation energy of a reaction.

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2.

What is meant by ‘reverse osmosis’?

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3.

What type of ores can be concentrated by magnetic separation method?

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4.

What is meant by ‘lanthanoid contraction’?

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5.

Calculate the packing efficiency of a metal crystal for a simple cubic lattice.

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6.

Explain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions of a unit cell of its crystal.

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7.

Differentiate between molarity and molality values for a solution. What is the effect of change in temperature on molarity and molality values?

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8.

The thermal decomposition of HCO2H is a first-order reaction with a rate constant of 2.4 x 10-3 s-1 at a certain temperature. Calculate how long will it take for three-fourths of the initial quantity of HCO2H to decompose.

(log 0.25 = - 0.6021)

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9.

What do you understand by the rate law and rate constant of a reaction?

Identify the order of a reaction if the units of its rate constant are:

(i) L-1 mol s-1

(ii) L mol-1 s-1
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10.

Describe the principle controlling each of the following processes:

(i) Preparation of cast iron form pig iron.

(ii) Preparation of pure alumina (Al2O3) from bauxite ore.
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