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Chemistry

Chemistry
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is

19
53
36
17

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Chemistry
The chemical substance present in bones and teeth is

Calcium chloride
Calcium borate
Calcium phosphate
Calcium sulphate

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Chemistry
One of the constituents of tear gas is

Ethanol
Ethane
Chloropicrin
Ether

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Chemistry
Rectified spirit is :

100% ethyl alcohol
Tincture iodine
95% ethyl alcohol
Methylated spirit

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Chemistry
Which of the following is used as non-stick coating for cooking utensils?

Polystyrene
Styrofoam
Teflon
Perspex

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Chemistry
The metal used to galvanise iron to protect it from rusting is

Chromium
Lead
Antimony
Zinc

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