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Chemistry

Chemistry
Which of the following is not present in German-silver?

Silver
Copper
Zinc
Nickel

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Chemistry
Total number of elements in the Periodic table

115
118
127
112

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Chemistry
The natural resource, known as black gold is

Lead
Platinum
Coal
Tin

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Chemistry
Silver gets corroded due to ________ in air.

Hydrogen Sulphide
Nitrogen
Oxygen
Carbon dioxide

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Chemistry
Which of the following molecules has a bond order of 2.5

NO
HCL
CO
F2

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Chemistry
Which of the following is not a gaseous air pollutant?

Oxides of nitrogen
Smoke
Oxides of sulphur
Hydrocarbon

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