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Chemistry

Chemistry
Which one of the following metals pollutes the air of a city having large number of automobiles?

Chromium
Lead
Copper
Cadmium

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Chemistry
Which of the following can be found as pollutants in the drinking water in some parts of India? Select the correct answer using the code given below.(A) Arsenic (B) Sorbitol (C) Fluoride (D) Formaldehyde (E) Uranium

A, C and E
A and C
A, B, C, D and E
B, D and E

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Chemistry
Charcoal is used in water treatment as a/an

Coagulant
Solvent
Adsorbent
Absorbent

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

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

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Chemistry
What is the mass percentage of carbon in carbon dioxide (CO2)

0.273
0.201
0.323
0.158

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Chemistry
Two elements which can form a large number of compounds are

Carbon and Oxygen
Carbon and Nitrogen
Carbon and Sulphur
Carbon and Hydrogen

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