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Chemistry

Chemistry
Liquid Nitrogen boils at

54 kelvin
77 kelvin
82 Kelvin
97 Kelvin

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Chemistry
Cement is formed by strongly heating a mixture of

Chalk and graphite
Limestone and clay
Clay and graphite
Limestone and graphite

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Smaller atomic radius
High bond dissociation energy
Stable half filled 2p sub level
High nuclear charge

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Chemistry
In chemical terms, what are alums used for purifying water for drinking purposes ?

Nitrates of aluminium
Hydrated chlorides
Double nitrate
Double sulphates

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Chemistry
The tip of the match-stick contains

Red phosphorus
Phosphorus trichloride
Phosphorus pentoxide
White phosphorus

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Chemistry
When a spoon is to be electroplated with nickel the spoon is

Made anode and a pure nickel rod, the cathode
Coated with nickel sulphate and dried
Made cathode and a pure nickel red, the anode
Dipped in a nickel sulphate solution

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