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Chemistry Past Questions and Answers

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Chemistry Questions

Question 1136:

In which of the following reactions has the oxidation number of nitrogen increased?

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A 2NO_(g) + Br_2(l) â†’ 2NOBr_(l)
B 2NO_(g) + O_2(g) → 2NO_2(g)
C FeSO_4(aq) + NO_(g) â†’ Fe(NO)SO_4(s)
D 2NO(g) + Cl_2(g) â†’ 2NOCl(l)

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Question 1137:

NH_3(g) + HCl_(g) â†’ NH₄Cl_(s)
The entropy change in the system above is

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A Negative
B Indeterminate
C Positive
D Zero

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Question 1138:

Fermentation is the

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A Breaking down of carbohydrate to glucose
B Conversion of sugar to alcohol in the presence of yeast
C Breaking down of sugar to carbohydrate
D Conversion of alcohol to sugar in the presence of yeast

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Question 1139:

The general formula for the alkanals is

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A ROH
B R₂CO
C RCOOR¹
D RCHO

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Question 1140:

The main impurity in iron ore during the extraction of iron is

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A Silicon (IV) oxide
B Carbon (IV) oxide
C Calcium trioxosilicate
D Sulphur (II) oxide

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