Question # 1

The partial pressure of 0₂in the lungus is

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116 torr

159 torr

560 torr

760 torr

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved

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sp³

sp

sp²

dsp³

Fresh water of total earth water is:

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1%

2%

3%

4%

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

The charring of glucose when it is heated with conc.H₂SO₄ is due to

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Oxidation

Reduction

Dehydration

Dehydrogenation

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Exothermic

Endothermic

Exothermic and fast

In which system hydrogen bonding is not present

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solution of ethanol in water

linking of helix in protein molecule

structure of ice

solution of NaCl in benzene

Which of the following is correct for epoxy resin

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Coating material for thermal power stations

It give chemical resistance

Epichlorohydrin is monomer

All of these

The optimum PH value fro the enzyme pepsin is:

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10

1.4

2

8

Newspaper can be recycled again and again by how many times

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5

4

2

3

Which of the hydrogen halides has the highest percentage of character?

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HCl

HBr

HF

Hl

A solution containing maximum amount of solute dissolved at a given temperature is called

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Saturated solution

Unsaturated solution

Supersaturated solution

Impure solution

Bell metal is an alloy of Sn and

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Copper

Iron

Zinc

Magnesium

Best way to prevent rusting of iron is by

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Making iron cathode

Putting it in saline water

Both of these

None of these

The largest number of molecules are present in

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3.6 g of H₂O

4.8 g of C₂H₅OH

2.8 g of CO

5.4 g of N₂O₅

Which statement is not correct

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Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

Ionization potential increases in moving from left to right in a period

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Because nuclear charge increase

Because atomic size decrease

Both (a) and (b)

Because atomic size increases

Factors affecting quality of water:

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D.O

BOD

COD

All of these

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

Teflon, styron and neoprene are all

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Copolymers

Condensation polymers

Homopolymers

Monomers

HCOOH reacts with conc. H₂SO₄to produce

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CO

CO₂

NO

NO₂

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