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Chemistry

Chemistry
Among the following, which is always found in free-state in nature?

Sodium
Gold
Copper
Silver

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Chemistry
The metallic constituents of hard water are :

Magnesium, calcium and tin
Calcium, magnesium and iron
Iron, tin and calcium
Magnesium, tin and iron

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Chemistry
Hard water and soft water can be distinguished by using

Dilute acid
Liquid soap
Ordinary soap
Detergent

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Chemistry
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is

All of them
Hydrogen
Oxygen
Carbon dioxide

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Chemistry
Which of the following is not a nitrogenous fertilizer ?

CaCN2
Ca(CN)2
Urea
NH4NO3

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Chemistry
The nuclear particles which are assumed to hold the nucleons together are

neutrons
mesons
electrons
positrons

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