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Chemistry Questions

Question 821:

Which of the following atoms represents deuterium?

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A No protons = 1, No of neutrons = 0, No of electrons = 0
B No protons = 1, No of neutrons = 0, No of electrons = 1
C No protons = 1, No of neutrons = 1, No of electrons = 1
D No protons = 1, No of neutrons = 2, No of electrons = 1

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Question 822:

A few drops of concentrated PCI are added to about 10cm<sup style='font-size: smaller;'>3</sup> of a solution of pH 3.4. The pH of the resulting mixtures is?

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A Less than 3.4
B Greater than 3.4
C Unaltered
D The same as that of pure water

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Question 823:

Which of the following compounds is a base?

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A CO<sub style='font-size: smaller;'>2</sub>
B CaO
C H<sub style='font-size: smaller;'>3</sub>PO<sub style='font-size: smaller;'>3</sub>
D CH<sub style='font-size: smaller;'>3</sub>COOCH<sub style='font-size: smaller;'>3</sub>

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Question 824:

20 cm<sup style='font-size: smaller;'>3</sup> of a 2.0 M solution of ethanoic acid was added to excess of 0.05 M sodium hydroxide. The mass of the salt produced is?<br/>(Na = 23, C = 12, O = 16, H = 1)

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A 2.50 g
B 2.73 g
C 3.28 g
D 4.54 g

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Question 825:

What volume of oxygen measured at s.t.p would be liberated on electrolysis by 9650 coulombs of electricity?<br/>(Molar volume of gas = 22.4 dm<sup style='font-size: smaller;'>3</sup>, F = 96,500 C mol<sup style='font-size: smaller;'>-</sup>)

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A 22.4 dm<sup style='font-size: smaller;'>3</sup>
B 11.2 dm<sup style='font-size: smaller;'>3</sup>
C 1.12 dm<sup style='font-size: smaller;'>3</sup>
D 0.560 dm<sup style='font-size: smaller;'>3</sup>

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