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Chemistry

Chemistry
Which of the following contains high content of lead?

High octane fuel
Cooking gas
Coal
Low octane fuel

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Chemistry
The substance which does not expand on going from liquid state to solid state is

Cast-iron
Water
Aluminium
Type metal

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Chemistry
Percentage of lead in lead pencils is

80
31-66
40

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Chemistry
Entropy of Universe is always

Increasing
Zero
Constant
Decreasing

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Chemistry
Conduction band electrons have more mobility than holes because they

Experience collision less frequently
Are lighter
Have negative charge
Need less energy to move them

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Chemistry
Which one of the following gases has the highest calorific value?

Coal gas
Natural gas
Water gas
Indane gas

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MORE MCQ ON Chemistry

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