Question # 1

Formation of cyanohydrin from an aldehyde in an example of.

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Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

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%

Which process of pulp making is mostly used in Pakistan.

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Kraft process

Sulphite process

Neutral sulphite semi chemical process

Wet process

Which woody raw material is used for the manufacture of paper pulp.

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Cotton

Bagasse

Poplar

Rice straw

In which ore carbon is present

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Magnesite

Epsom salt

Barite

Sylvite

Which gas is used for artificial ripening of fruits

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Ethene

Metheane

Propane

Ethyne

In modern periodic table VI period contains elements

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8

18

10

32

Synthetic rubber is made by polymerization of

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Vinylaecetate

Acetylene

Divinylacetylene

Chloroprene

Aromatic compounds burns with sooty flame because.

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They have high percentage of hydrogen

The have a right structure

The have high percentage of carbon

The resist reaction with air

An aldehyde is reduced to alkane with hydrazine is the presence of

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KOH

NaOH

CaO and NaOH

Ca(OH)2

Which of the following is an ester.

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Soap

Starch

PVC

Dacron

Keeping in view size of atoms ,which order is the correct one.

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > I

Which of the following compounds will not give Iodoform test on treatment with I₂/ NaOH

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Acetaldehyde

Acetone

Butanone

3-Pentanone

d -block elements which show anomalous configuration in first series are

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Cr and Ni

Cr and Cu

Cu and CO

Fe and Ni

Which of the following is non-typical transition element

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Cr

Mn

Zn

Fel

Out of all the elements of Group V-A the highest ionization energy is possessed by

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N

P

Sb

Bi

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