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Chemistry

Chemistry
Among the following, which is always found in free-state in nature?

Sodium
Silver
Gold
Copper

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Chemistry
Match the sourc in Column B with the product of Column A. (Product) Column B (Source)A. Formic acid1. LemonB. Citric acid 2. TamarindC. Tartaric acid3. Ants

A B C3 2 1
A B C 3 1 2
A B C 2 1 3
A B C 2 3 1

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Chemistry
Which one of the following minerals is found in pure form?

Manganese
Copper
Bauxite
Iron

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Chemistry
The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas

Will be doubled
Will increase four-fold
Remains unchanged
Will be reduced to half

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Chemistry
The major use of sulphur is in the manufacture of

Fungicide
H2SO4
SO2
H2S

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Chemistry
The octane number of zero is assigned to

3-methyl octane
2-methyl octane
iso-octane
n-heptane

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