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Chemistry

Chemistry
Vulcanization of rubber is carried out by adding

Sulphur
Carbon
Phosphorus
Ozone

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Chemistry
The chemical name of quartz is

Sodium phosphate
Calcium oxide
Sodium silicate
Calcium phosphate

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Chemistry
When iron rusts, its weight

First increases and then decreases
Remains the same
Decreases
Increases

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Chemistry
Cement containing excess amount of lime

Becomes more strong
Is quick setting
Cracks during setting
Is slow setting

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Chemistry
Which one of the following nonmetals shows allotropy in the liquid state?

Sulphur
Bromine
Carbon
Phosphorous

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Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 6, 8, 4
2, 10, 8
2, 8, 8, 2
2, 8, 10

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