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Chemistry

Chemistry
The weight of 6.023 × 1022 atoms of carbon is

12 gms
1.2 gms
0.12 gms
120 gms

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Chemistry
Which one is the lightest element in the periodic table

Hydrogen
Carbon
Helium
Oxygen

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Chemistry
The advantage of detergents over soaps is

Soaps give lather with only soft water
Detergents could not give much lather
Detergents give lather even with hard water
Detergents are soluble in water

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Chemistry
Which one is a soluble salt in H2O

CuS
CaCl2
Zn(OH)2
PbCl2

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Chemistry
Threshold limit value of copper in the atmospheric air is

1.0 mg/m3
0.01 mg/m3
0.001 mg/m3
5.0 mg/m3

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Chemistry
Philosopher’s Wool is

Zinc sulphate
Zinc blende
Zinc oxide
Zinc carbonate

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