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Chemistry

Chemistry
The first metal used by a man was

Copper
Silver
Bronze
Brass

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Chemistry
If the equilibrium constants for the systems H2 + I2 ? 2HI and 2HI ? H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :

K 1 = 1 /K2
K1 = 2K2
K1 = K2
K1 = K2/2

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Chemistry
When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to

NO2
N2O
SO2
SO3

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Chemistry
The chemical used for cloud seeding for artificial rains is

Potassium Bromide
Potassium Nitrate
Silver Iodide
Silver Nitrate

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Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Ammonia
Nitrogenase
Nitrates

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Chemistry
Periodic table contains how many periods

6
8
7
10

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MORE MCQ ON Chemistry

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