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Chemistry

Chemistry
Total number of halogen elements found in the periodic table is

8
3
5
13

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Chemistry
Detergents clean surfaces on the principle of

Floatation
Surface tension
Elasticity
Viscosity

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Chemistry
Which of the following will replace hydrogen from acids to form salts ?

S
Ag
P
Na

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Chemistry
The gas produced in marshy places due to decomposition of vegetation is

Methane
Carbon dioxide
Carbon monoxide
Sulphur dioxide

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Chemistry
Of the following compounds of calcium, the one having highest covalent character is

CaF2
CaBr2
Cacl2
Cal2

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Chemistry
Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes ?

Sodium chloride
Borax
Saltpetre
Hydrogen peroxide

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