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Chemistry

Chemistry
Nucleus of an atom consists of.

Proton and Neutron
Proton
Electron, Proton and Neutron
Neutron

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Chemistry
Which among the following metals provides amphoteric oxide ?

Sodium
Aluminium
Silver
Calcium

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Chemistry
What is the atomic number of mercury

63
41
32
80

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Chemistry
Which of the following fibres catches fire least ?

Rayon
Cotton
Terricot
Nylon

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Chemistry
Citric acid is present in free form in

Milk
Tamarind
Apple
Lemon

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Chemistry
One of the following is used to dissolve noble metals. That is

Hydrochloric acid
Nitric acid
Sulphuric acid
Aqua ragia

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