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Chemistry

Chemistry
Brass is a solution of molten copper in

Solid zinc
Molten zinc
Molten tin
Gaseous zinc

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Chemistry
The acid rain destroys vegetations because it contains

Sulphuric acid
Nitric acid
Ozone
Carbon monoxide

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Chemistry
Number of6.023 × 1020 atoms present in one mole of a gas at STP is

'6.023 × 10–23
6.023 × 1023
'6.023 × 10–20
6.023 × 1020

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Chemistry
Non-stick kitchenwares are coated with

Graphite
Silicon
PVC
Teflon

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Chemistry
The most commonly used chemicals in the artificial rainmaking or cloud seeding are

All of these
Dry Ice (Frozen CO2)
Silver Iodide (Ag I)
Sodium Chloride (NaCl)

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Chemistry
The main constituent of biogas is

Methyl alcohol
Oxygen
Acetic acid
Methane

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