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Chemistry Past Questions and Answers

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Chemistry Questions

Question 2716:

Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?

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A Iron
B Sodium
C Aluminium
D Calcium

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Question 2717:

The conclusion from Rutherford's alpha-scattering experiment is that

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A Atoms are mostly empty space with a small nucleus
B Emissions from radioactive substances consist of three main components
C There is nuclear pull on orbital electrons
D Electrons are deflected by both magnetic and electric fields

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Question 2718:

An element Y has the electronic configuration 1s<sup style='font-size: smaller;'>2</sup>2s<sup style='font-size: smaller;'>2</sup>2p<sup style='font-size: smaller;'>6</sup>6<sup style='font-size: smaller;'>2</sup>3p<sub style='font-size: smaller;'>4</sub>. To what period does it belong in the periodic table?

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A 3
B 4
C 5
D 6

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Question 2719:

If a metal R forms a compound with the formula R(NO<sub style='font-size: smaller;'>3</sub>)<sup style='font-size: smaller;'>2</sup> , the formula of its tetraoxosulphate (IV) is

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A R(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>2</sub>
B RSO<sub style='font-size: smaller;'>4</sub>
C R<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
D R<sub style='font-size: smaller;'>2</sub>(SO<sub style='font-size: smaller;'>4</sub>)<sub style='font-size: smaller;'>3</sub>

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Question 2720:

Which of the following decreases when a given mass of gas is compressed to half its initial volume?

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A Average intermolecular distance
B Frequency of collisions
C Number of molecules present
D Atomic radius of each particle

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