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Chemistry Questions

Question 271:

When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?

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A H<sub style='font-size: smaller;'>2</sub>S
B Ag<sub style='font-size: smaller;'>2</sub>S
C PbS
D HNO<sub style='font-size: smaller;'>3</sub>
E S

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Question 272:

The production of ammonia by the haber process may be represented by the equilibrium equation N<sub style='font-size: smaller;'>2</sub>(g) + 3H<sub style='font-size: smaller;'>2</sub>(g) â†” 2NH<sub style='font-size: smaller;'>3</sub> âˆ†H = -22KJ. Therefore the production of ammonia will be favoured by?

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A Only high pressure
B Only high temperature
C A combination of high temperature and low pressure
D A combination of low temperature and high pressure
E Low pressure

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Question 273:

Which of the following represents ethyl ethanonate?

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A CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
B (CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>)<sub style='font-size: smaller;'>2</sub>O
C CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
D CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
E CH<sub style='font-size: smaller;'>3</sub>CH<sub style='font-size: smaller;'>2</sub>COCH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>

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Question 274:

Which of the following equations represents an oxidizing action of sulphur dioxide?

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A SO<sub style='font-size: smaller;'>2</sub> + 2HNO<sub style='font-size: smaller;'>2</sub> â†’ H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2NO<sub style='font-size: smaller;'>2</sub> + heat
B 2SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + O<sub style='font-size: smaller;'>2</sub> → 2H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
C SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>O + CI<sub style='font-size: smaller;'>2</sub> â†’ H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 2HCI
D SO<sub style='font-size: smaller;'>2</sub> + 2H<sub style='font-size: smaller;'>2</sub>S â†’ 3S + 2H<sub style='font-size: smaller;'>2</sub>O
E K<sub style='font-size: smaller;'>2</sub>Cr<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>7</sub> + H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + 3SO<sub style='font-size: smaller;'>2</sub> â†’ K<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + Cr<sub style='font-size: smaller;'>2</sub>(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub> + H<sub style='font-size: smaller;'>2</sub>O

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Question 275:

If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?

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A 2.0
B 1.8
C 1.4
D 1.0
E 0.5

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