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Chemistry

Chemistry
Which of the following elements is obtained from sea weeds ?

Iodine
Sulphur
Vanadium
Argon

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Chemistry
What is the atomic number of Oxygen

12
8
22
5

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Chemistry
Combustion of a candle is a/an

Physical change
Endothermic reaction
Photochemical reaction
Exothermic reaction

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Chemistry
Detergents are

None of these
Sodium salts of sulphonic acids
Sodium salt of benzoic acid
Sodium salts of fatty acids

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Chemistry
Spontaneous change is one in there is:

An increase in Internal energy
Increase in free energy
A lowering of entropy
A lowering of free energy

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Chemistry
Rock salt is a mineral containing

Potassium
Magnesium
Sodium
Iron

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MORE MCQ ON Chemistry

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