Question # 1

The word paper is derived form the name of which reedy plant:

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rose

sun flower

papyrus

water hyacinth

Cellulose is the polymer of

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α-D-glucose

β-D-glucose

Fructose

None

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

Diamond is a bad conductor of electricity because:

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it has a tight structure

it has a high density

there are no free electrons

none of the above

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

One dm³of O₂at STP has mass

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32 g

16 g

4.438 g

1.4383 g

The energy produced by a carbohydrate is

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3 kcal/gm

2 kcal / gm

6kcal / gm

4 kcal/ gm

A molecule of polysaccharide hydrolysis produces __________ molecules of:

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2

3

2-10

100

An oxidixing agent

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K₂Cr₂O₇

H₂SO₄

FeSO₄

K₂SO₄

Minamata disease is due to pollution of

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Organic waste into drinking water

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Acetic Acid reacts with PCl₅ giving:

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Acetamid

Acetyl chloride

Alcohol

ether

The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct

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It is costly

It damages the engine

Pb is difficult to obtain in bulk quantities

The combustion product, lead, causes air pollutions

When methane reacts with Cl₂in the presence of diffused light the products obtained are

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a, b, c

Product of concentration of ions raised to the power equal to the co-efficient of ions in balanced equation for saturated solution of a salt is called

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Ionic product

Equilibrium constant K_c

K_w

Solubility product (K_sp)

During redox reaction an oxidizing agent

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Gains electrons

Is oxidized

Loses electrons

Hydrolysed

Atomospheric pollutant is

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CO₂

CO

O₂

N₂

Chief ore of aluminium is:

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Na₃AIF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃ .H₂O

Hydrogen gas and iodine vapours combine to form Hl at 425°C, the same composition of mixture is present if we start with decomposition of Hl. It suggests

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A static equilibrium

Law of mass action

A dynamic equlibrium

Irreversible reaction

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