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Chemistry

Chemistry
Copper is refined by

Roasting
Zone refining
Electrolysis
Oxidation

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Chemistry
The metal compound commonly found in Sindhoor or Kumkum is based on

Zinc
Copper
Lead
Tin

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Chemistry
Ferrous sulphate is used in water treatment as a/an

Coagulant aid
Oxidizing agent
Reducing agent
Adsorbent

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Chemistry
Catalyst is a substance which

None of these
Decreases the rate of reaction
Has no action on the rate of the reaction
Increases the rate of the reaction

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Chemistry
Which of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch lights, electric shavers, etc. ?

Iron and cadmium
Lead peroxide and lead
Nickel and cadmium
Zinc and carbon

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Chemistry
Dry powder fire extinguishers contain

Sand
Sand and sodium carbonate
Sand and sodium bicarbonate
Sand and potassium carbonate

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