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Chemistry Questions

Question 136:

An anhydride is

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A A compound wich has no water of crystallization
B An oxide whose solution in water has a PH greater than 7
C An oxide whose solution in water has a PH less than 7
D An oxide that has hydrogen atoms
E An amphoteric oxide

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Question 137:

In which of the following reactions is sulphur dioxide acting as an oxidizing agent?

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A SO <sub style='font-size: smaller;'>2</sub> + 2HNO<sub style='font-size: smaller;'>3</sub> â†’H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + NO<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 SO<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O â†’ H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>3</sub>

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Question 138:

Calcium hydroxide and ammonium chloride when heated together will give an important product. This compound may be obtained dry by

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A Dissolving it in water, recrystallizing it and then drying in the oven
B Passing it through a concentrated aqueous solution of sodium hydroxide
C Passing it through calcium oxide
D Passing it through concentrated sulphuric acid
E Passing it through anhydrous calcium choride

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Question 139:

Starch can be converted to ethyl alcohol by

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A Distillation
B Fermentation
C Isomerization
D Cracking
E Cooking

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Question 140:

The reaction between hydrogen and iodine may be represented by the equation H<sub style='font-size: smaller;'>2</sub>(g)+ I<sub style='font-size: smaller;'>2</sub>(g) â†’ 2HI(g), and is exothermic. Therefore

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A An increase in temperature favours the forword reaction
B An increase in pressure favours the backward reaction
C Both pressure and temperature muct be increased to favour the forward reaction
D A decrease in temperature will favour the forward reaction
E A decrease in pressure and an increase in temperature will favour the forward reaction

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