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Chemistry

Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Oxygen
Iron
Magnesium
Silicon

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Chemistry
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

levigation
magnetic separation
liquation
leaching

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Smaller atomic radius
High nuclear charge
Stable half filled 2p sub level
High bond dissociation energy

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Chemistry
Chloroform can be used as

Anaesthetic
Antibiotic
Antimalarial
Analgesic

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Chemistry
The first organic compound synthesised in the laboratory was

Lactic acid
Uric acid
Urea
Glucose

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Chemistry
The weight of 6.023 × 1022 atoms of carbon is

120 gms
1.2 gms
12 gms
0.12 gms

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MORE MCQ ON Chemistry

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