Question # 1

Cotton is __________ % cellulose

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90

100

99

30

Which one among the following is not a natural polymer?

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protein

cellulose

nylon

nucleic acid

coordination number of N^a+ in NaC is:

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1

2

4

6

The system in which two out of three axes are of equal length and angles are all 90°

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cubic system

hexagonal system

trigonal system

tetragonal system

Fine powder gypsum is mixed with clinker up to:

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4%

6%

5%

7%

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

Ethanol reacts with sodium metal to liberate

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CO2 gas

CO gas

H2 gas

Steam

Water is essential for life on

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Moon

Space

Earth

Sun

The ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

which chlorine compound has bonding that can be described as ionic with some convalent character?

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NaCI

MgCI₂

AICI₃

SiCI₄

The wave length of visible light is 500 nm. In S.I. unit this value is

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5 x 10^-8m

5 x 10^-9m

500 x 10^-7m

500 x 10^-9m

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

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Planar triangle

Pyramidal

Tetrahedral

Square planar

10g Of NaOH Has Been Dissolved Perdm³of solution. The morality of solution is :

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0.025 M

1.5 M

0.1 M

.25 M

In which type of following solutions the total volume of solutions may not be necessarily equal to sum of volumes of solute and solvent ?

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Percentage volume/volume

Percentage volume/weight

Percentage weight/volume

Percentage weight/weight

Hypo is used in photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

The ionization constant of an acid is expressed in term of the following constant

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Kw

Kn

Ka

Kb

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because:

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They have an electrophilic carbon

They have an electrophilic carbon and good living gorup

They have an electrophilic carbon and bad living group

They have an nucleophilic carbon and good living gorup

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

Aromatic carboxylic acids have carboxyl group attached to group :

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Alkyl group

Aryl group

Phenyl group

Benzyl group

Which of the following undergoes uncleophilic substitution exclusively by S_N1 mechanism?

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Benzyl chloride

Ethyl chloride

Chlorobenzene

Isopropyl choride

Crystalline form of sulphur stable at room temperature is

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Rhombic sulphur

Monoclinic sulphur

Plastic sulphur

Prismatic sulphur

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