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Chemistry

Chemistry
Which substance is used to retard the setting action of cement?

CaO
Al2O3
Na2O + K2O
CaSO4, 2H2O

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Chemistry
Which of the following is used in making smoke bombs?

Phosphorus
Carbon
Hydrogen
Sulphur

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Chemistry
Bhopal gas tragedy is associated with leakage of

Methyl isocyanate
Sulphur dioxide
Carbon dioxide
Nitrogen dioxide

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Chemistry
Philosopher’s Wool is

Zinc carbonate
Zinc sulphate
Zinc blende
Zinc oxide

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Chemistry
Organic compounds are

Interstitial compounds
Co-ordination compounds
Ionic compounds
Covalent compounds

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Chemistry
Periodic table contains how many periods

6
10
8
7

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