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Chemistry Past Questions and Answers

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Chemistry Questions

Question 231:

When sodium nitrate dissolves in water, âˆ†H is positive. This means that?

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A The reaction is catalysed
B The reaction is complete
C The reaction is exothermic
D The reaction is endthermic
E Sodium nitrate is highly soluble in water

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Question 232:

If an organic compound decolorizes bromine water then the compound is?

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A Saturated
B Supersaturated
C Unsaturated
D A solid
E Protonated

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Question 233:

When air is compressed?

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A Its density decreases
B It solidifies
C Its temperature decreases
D Its temperature increases
E Its temperature remains unchanged

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Question 234:

Fats and oils are?

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A Addition products of long chain fatty acids and alkali
B Addition products of long-chain fattyy acids and glycerol
C Condensation products of long-chain fatty acids and glycerol
D Condensation products of formaldehyde and glycerol
E Liquids at 20Â°C

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Question 235:

Which of the following statements about phosphorus is NOT correct?

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A Phosphorus is a solid mineral
B Phosphorus is obtained by oxidation reaction of phosphate
C Phosphorus exists in two allotropic forms
D Both forms of phosphorus are interconvertible
E Yellow phosporus ignites when rubbed on a rough surface

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