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Chemistry

Chemistry
Earth’s atmosphere is an envelope of gases extending to a height of

300 km
150 km
200 km
100 km

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Chemistry
Sweat contains water and ________

Citric acid
Vinegar
Salt
Lactic acid

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Chemistry
________ gives hardness to stainless steel.

Lead
Zinc
Tin
Carbon

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Chemistry
Photo-oxidation process is initiated by

Oxygen
Catalyst
Heat
Light

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Chemistry
PH scale ranges from

0 – 14
8 – 14
0 – 7
None

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Chemistry
Oxide of sulphur present in the atmosphere are washed down by rains to cause :

Eutrophication in lakes
Depletion of fossil fuel reserves
Lowering of pH of soil
Industrial smog formation

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