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Chemistry Past Questions and Answers

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Chemistry Questions

Question 496:

Corrosion is exhibited by?

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A Iron only
B Electropostive metals
C Metals below hydrogen inthe electrochemical series
D All metals

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Question 497:

Inspite of 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;'>2</sup>, carbon is tetraavalent because?

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A The electrons in both 2s and 2p orbitals have equal energy
B The electrons in both 2s and 2p orbitals are equivalent
C Both the 2s and 2p orbitals hybridizes
D The six orbitals hybridize to four

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Question 498:

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

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A CH<sub style='font-size: smaller;'>3</sub> = CHCH<sub style='font-size: smaller;'>3</sub>
B CH<sub style='font-size: smaller;'>3</sub> ≡ CCH<sub style='font-size: smaller;'>3</sub>
C HC = C-CH<sub style='font-size: smaller;'>2</sub>CH<sub style='font-size: smaller;'>3</sub>
D CH<sub style='font-size: smaller;'>2</sub> = CH-CH = CH<sub style='font-size: smaller;'>2</sub>

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Question 499:

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

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A Branched chain alkanes
B Straight chain alkanes
C Cycloalkanes
D Halogenated hydrocarbons

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Question 500:

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

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A Trichloromethane
B Triodomethane
C Iodoethane
D Ethanal

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