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Chemistry Past Questions and Answers

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Chemistry Questions

Question 506:

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 507:

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 508:

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 509:

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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Question 510:

The most volatile fraction obtained from fractional distillation of crude petroleum contains?

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A Butane , propane and kerosene
B Butane , propane and petrol
C Ethane, methane and benzene
D Methane, ethane and propane

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