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Chemistry

Chemistry
Which one of the following chemicals helps in fruit ripening?

Atrazine
Malathion
Isoproturan
Ethephon

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Chemistry
For a spontaneous chemical process, the free energy change is

Depends on whether the reaction is exothermic or endothermic
Zero
Positive
Negative

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Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

s-electrons in Mg(Z = 12)
p-electrons in CI(Z = 17)
d-electrons in Fe(Z = 26)
p-electrons in Ne(Z = 10)

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Chemistry
Stainless steel is an alloy of

Chromium and carbon
Chromium, carbon and iron
Carbon and iron
Chromium and iron

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Chemistry
If lime water is kept in the air, it turns milky due to presence of :

Carbondioxide
Nitrogen
Oxygen
Sulphurdioxide

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

0.509
0.658
0.305
0.727

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