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Chemistry

Chemistry
Solder metal is an alloy of

Copper and tin
Lead and tin
Copper and zinc
Lead and antimony

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Chemistry
Which halide is used in making sensitive emulsion on photograhic film?

Silver bromide
Sodium chloride
Silver iodide
Silver chloride

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Chemistry
What particles move around the nucleus of an atom and are negatively charged?

Positrons
Electrons
Neutrons
Protons

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Chemistry
The chief constituent of natural gas is:

Nitrogen
Propane
Methane
Helium

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Chemistry
Bone ash contains

Calcium hypophosphate
Calcium sulphate
Calcium phosphate
Phosphoric sulphate

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Chemistry
Heating of a ore below its melting point in the absence of air is known as

Refining
Smelting
Roasting
Calcination

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