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Chemistry

Chemistry
What is the atomic number of mercury

41
63
80
32

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Chemistry
Which is the heaviest metal among the following?

Silver
Gold
Iron
Copper

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Chemistry
A thick paste of cement, sand and water is called

R.C.C.
Mortar
Concrete
Kiln

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Chemistry
The gas used in the manufacture of vanaspati from vegetable oil is

hydrogen
carbon dioxide
nitrogen
oxygen

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Chemistry
The two metal ions that cause hardness to water are:

Sodium, Potassium
Sodium, Magnesium
Sodium, Calcium
Calcium, Magnesium

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Chemistry
Which of the following does the Nucleus of an atom consist of?

Protons and neutrons
Protons
Electrons
Protons and electrons

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