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Chemistry Past Questions and Answers

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Chemistry Questions

Question 731:

An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?

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A Number of molecules of the gas
B Density of the gas molecules
C Number of collisions between the gas molecules
D Number of collisions between the gas molecules and the walls of the container

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Question 732:

The nucleus of the isotope tritium, contains?

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A Two neutrons with no protons
B One neutron and one protons
C Two neutrons and one proton
D Two neutrons, one proton and one electron

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Question 733:

How many lone pairs of electron are there on the central atom of the H<sub style='font-size: smaller;'>2</sub>O molecules?

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A 1
B 2
C 3
D 4

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Question 734:

<sup style='font-size: smaller;'>14</sup><sub style='font-size: smaller;'>7</sub>N + X â†’ <sup style='font-size: smaller;'>17</sup><sub style='font-size: smaller;'>8</sub>O + <sup style='font-size: smaller;'>1</sup><sub style='font-size: smaller;'>1</sub> H. In the above reaction, X is a?

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A Neutron
B Helium atom
C Litgium atom
D Deuterium atom

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Question 735:

The pollutants that are likely to be present in an industrial environment are?

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A H<sub style='font-size: smaller;'>2</sub>S,SO<sub style='font-size: smaller;'>2</sub> and oxides of nitrogen
B NH<sub style='font-size: smaller;'>3</sub>, HCI and CO
C CO<sub style='font-size: smaller;'>2</sub>, NH<sub style='font-size: smaller;'>3</sub> and H<sub style='font-size: smaller;'>2</sub>S
D Dust, NO and CI<sub style='font-size: smaller;'>2</sub>

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