Question # 1

The first ionization energy of Na, Mg, Al and Si are in theorder of.

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Na < Mg < Al < Si

Na > Mg> Al> Si

Na > Mg< Al< Si

Na< Mg> Al< Si

Benzene molecule is made up of.

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3- pi and 9 sigma bonds

6- pi and 6 sigma bonds

6 -pi and 12 sigma bonds

4 -pi and 12 sigma bonds

When ethyl bromide is heated with Ag2O the product formed is.

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Ethanol

Ethene

Ethanol

Di ethyl ether

Catalyst used in thermal cracking

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Platinum

Nichel

Al2O3 and SiO2

Fe2O3 and CuO

When concentrated H2SO4 and solid sodium chloride react together at room temperature the product are.

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Two salts only

A salt and a base

A salt and an acid

A salt and water

The percentage of carbon in different types of iron products is in the order of

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cast iron > wrought iron > steel

wrought iron > steel > cast iron

cast iron > steel > wrought iron

cast iron = steel > wrought iron

Co-ordination number of Pt in Pt Cl(NO₂)(NH₃)₄

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2-

4

1

6

Which one of the following is a metalloid.

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sulphur

Antimony

Mercury

Zinc

Which of the follow8ing is not a fatty acid.

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Propanoic acid

Acetic acid

Phthalic acid

Butanoci acid

Acetic acid is commercially prepared form

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Ethene

Ethane

Ethyne

Ethanol

S_N2 mechanism involves

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1st order kinetics

2nd order kinetics

3rd kinetics

zero order kinetics

Formula of chloroform is

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

Which one of the following is not use of acetic acid.

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Coagulant for rubber latex

Local irritant

Formation of rayon and silk

Formation of alcohol

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Which raw material is used for preparation of bleaching powder.

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Cl2 and H2O

Cl2 and Lime

Cl2 and HOCl

HCl and Lime

When water is added to plaster of paris, it changes to a hard mass. Its volume also expands upto

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1%

2%

3%

5%

Glycoside linkage is present in

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Proteins

Nylon -6,6

Starch

DNA

Paraldehyde is polymer of.

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HCHO

CH3CHO

CH3COCH3

CH3CH2-CH2OH

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