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Chemistry Past Questions and Answers

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Chemistry Questions

Question 266:

In the reaction NH3 + H+ â†’ NH4+, the bond formed results from?

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A An electron transferred from NH<sub style='font-size: smaller;'>3</sub> + H<sup style='font-size: smaller;'>+</sup>
B An electron pair donated by NH<sub style='font-size: smaller;'>3</sub>
C An electron pair equally shared
D An electron pair donated by H<sup style='font-size: smaller;'>+</sup>
E An electron tarnsferred from H<sup style='font-size: smaller;'>+</sup> to NH<sub style='font-size: smaller;'>3</sub>

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Question 267:

Which of the following CANNOT be obtained by fractional distillation of petroleum?

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A Ether
B Methane
C Butane
D Ethene
E Hydrogen

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Question 268:

In the reaction N<sub style='font-size: smaller;'>2</sub>(g) + O(g) <br/>â†” 2NO(g) produced i an increase in the total pressure will?

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A Cause less nitrogen to be produced in the equilibrium mixture
B Cause less nitric oxide to be produced in the equilibrium mixture
C Cause more nitric oxide to be produced in the equilibrium mixture
D Cause more oxygen to be produced in the equilibrium mixture
E Have no effect

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Question 269:

In the chemical reaction A + B \(\to\) C + D, more of D is formed?

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A If the concentrated of A is reduced
B If the concentrated of B is reduced
C If the concentrated of C is reduced
D If the concentration of C is increased
E If D is continuously removed from the reaction mixture

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Question 270:

1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen. <br/>The formula of the oxide is?

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A X<sub style='font-size: smaller;'>2</sub>O
B XO
C XO<sub style='font-size: smaller;'>2</sub>
D X<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3</sub>
E X<sub style='font-size: smaller;'>3</sub>O<sub style='font-size: smaller;'>4</sub>

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