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Chemistry

Chemistry
Silicon is used in

Transistors
All of these
Solar energy devices
Semiconductors

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Chemistry
Global warming is mainly due to accumulation of

Oxides of sulphur
Carbon monoxide
Oxides of nitrogen
Carbon dioxide

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Chemistry
The number of moles of solute present in 1 kg of a solvent is called its

normality
molality
formality
molarity

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Chemistry
Which of the following is used in welding broken pieces of iron rails and machine parts?

Solder
Aluminium sulphate
Aluminium powder
None of these

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Chemistry
The working of a dry cell is based on

Spontaneous oxidation-reduction reaction
Combination reaction
Decomposition reaction
Electrolysis

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Chemistry
Number of hydrogen atoms in a Glucose molecule

8
14
12
6

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