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Chemistry

Chemistry
Among the following, carbonate ore of Zinc is

Zincblende
Calamine
Zincite
Sphalerite

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Chemistry
The chemical substance present in bones and teeth is

Calcium borate
Calcium sulphate
Calcium phosphate
Calcium chloride

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Chemistry
Which one of the following gases has the highest calorific value?

Coal gas
Indane gas
Natural gas
Water gas

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Chemistry
The value of gas constant R in Ergs deg–1 mole–1 is

4.183 × 107
8.341 × 107
8.314 × 107
8.413 × 107

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Chemistry
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :

Battery
Generator
Uninterrupted power supply (UPS)
Power transmittor

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Chemistry
Cloud is a colloidal dispersion of

Air in a dispersion medium of water
Mist in a dispersion medium of air
Fog in a dispersion medium of water
Water drops in a dispersion medium of air

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