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Chemistry Past Questions and Answers

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Chemistry Questions

Question 261:

Which of the following statements is incorrect?

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A Calcium reacts with water to form calcium
B Magnesium reacts very slowly with water but faster with warm water
C Iron will not react with water in the absence of air
D Sodium reacts with water
E Copper reacts with steam

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Question 262:

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 263:

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 264:

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 265:

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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