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Chemical formula for water is

NA
C6H12O6
H2SO4
H2O


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Some substances absorb moisture from the air on exposure. This property is called

Efflorescence
Desiccation
Osmosis
Deliquescence


Deliquescence occurs when the vapour pressure of the solution that is formed is less than the partial pressure of water vapour in the air. All soluble salts will deliquesce if the air is sufficiently humid.

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Silicon carbide is used in

Disinfecting lakes
Making Steel
Cutting very hard substances
Making statues


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Fe, Co and Ni groupped together is called as

Main metals
Platinum group metals
Alkali group metals
Transition metals


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Heavy water is also known as

Nitrous oxide
Deuterium oxide
Silicon dioxide
Zinc oxide


Nitrous oxide,also known as laughing gas, nitrous, nitro, or NOS is a chemical compound with the formula N2O. It is an oxide of nitrogen. At room temperature, it is a colourless, non-flammable gas, with a slightly sweet odour and taste. It is used in surgery and dentistry for its anaesthetic and analgesic effects.

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The element common to all acids is

Nitrogen
Sulphur
Oxygen
Hydrogen


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How can we remove permanent hardness of water

By addition of sodium carbonate
By addition of Sugar
By addition of sulphur
By addition of lime


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Which of the following is most soluble in water

Lime
Sugar
Mercury
Sulphur


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Laughing gas is also known as

Chlorine dioxide
Nitrous Oxide
Bromine dioxide
Sulfur dioxide


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Actinides are the elements with atomic numbers from

68 to 88
104 to 110
22 to 35
89 to 103


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