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Chemistry Past Questions and Answers

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Chemistry Questions

Question 2711:

When alkynes are hydrogenated completely, they produce compounds with the general molecular formula

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A C <sub style='font-size: smaller;'>n</sub>H <sub style='font-size: smaller;'>n</sub>
B C <sub style='font-size: smaller;'>n</sub>H <sub style='font-size: smaller;'>2n+2</sub>
C C<sub style='font-size: smaller;'>n</sub>H <sub style='font-size: smaller;'>2n</sub>
D C<sub style='font-size: smaller;'>n</sub>H<sub style='font-size: smaller;'>2n-2</sub>

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Question 2712:

The following compounds are hydrocarbons except

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A Methylpropanoate
B 2-methylbutane
C Benzene
D Cyclohexane

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Question 2713:

Which of the following statements about soapless detergents is correct? They

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A Lather readily with hard water
B Increase the surface tension of water
C Cause hydrolysis of salts in water
D From a curdy precipitate with soft water

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Question 2714:

The atom of an element X is represented as \(^y_z X\). The basic chemical properties of X depend on the value of

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A Y
B Z
C Y - Z
D Z - Y

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Question 2715:

A hydrogen atom which has lost an electron contains

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A One proton only
B One neutron only
C One proton and one neutron
D One proton, one electronic and one neutron

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