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NAT I Engineering Chemistry MCQs With Answers

Question # 1

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

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Question # 2

The heats evolved in combustion of rhombic and monoclinic sulphur are - 70960 and -71030 cal mol^-1 respectively what will be heat of conversion of rhombic sulphur ti monoclinic?

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70960 calories

71030 calories

-70 calories

+70 calories

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Question # 3

The maximum number of electrons in a subshell for which / = 3 is

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Question # 4

The disaccharide present in milk is

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Sucrose

Maltose

Lactose

Cellobiose

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Question # 5

Which of the following method is most appropriate for the manufacture of methane?

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By reduction of CH2CL2

Wurtz reaction

Liquification of natural gas

None of these

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Question # 6

Which of the following geometry is associated with the compound in which the central atom assumes sp³ d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

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Question # 7

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

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Question # 8

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

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Question # 9

Which quantum number is sufficient to describe the electron is hydrogen atom?

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Question # 10

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

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Question # 11

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

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