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Chemistry

Chemistry
Isobars are lines joining places having equal

Population
Height above sea-level
Rainfall
Pressure

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

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

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Chemistry
Chemical composition of cement is

Limestone, Clay and Gypsum
Limestone and Clay
Limestone and Gypsum
Clay and Gypsum

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Chemistry
The ‘Green House effect’ is produced due to the presence of excess amount of

Carbon monoxide
Sulphur dioxide
Nitrogen dioxide
Methane

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Chemistry
Magnalium is an alloy of

Magnesium and Tin
Aluminium and Magnesium
Manganese and Magnesium
Aluminium and Zinc

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Chemistry
The chemical that is used to ripen mangoes is

Calcium carbide
Calcium sulphide
Calcium carbonate
Calcium chloride

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