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Chemistry

Chemistry
The lowest layer of earth's atmosphere is

Stratosphere
Ionosphere
Troposphere
Mesosphere

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Chemistry
An element of atomic no. 29 belongs to

P-block
F-block
S-block
D-block

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Chemistry
Urea is a

Phosphatic fertilizer
Sodium fertilizer
Potassium fertilizer
Nitrogenous fertilizer

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Chemistry
The most volatile of the given liquids is

Liquid He
Liquid NH3
Liquid
Ether

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Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

3
4
7
6

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Chemistry
Combustion of a candle is a/an

Physical change
Photochemical reaction
Exothermic reaction
Endothermic reaction

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