Question # 1

Hydration of ethene is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

One of the following can produce greater number of moles of ethyl chloride on reacting with escess of ethanol

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PCI5

PCI3

HCI/ZnCl2

SOCI2

Which one of the following gases has lowest density at room temperature:

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NH₃

Ne

N₂

CO

Plastics are a pollution problem because many plastics

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are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

Iodine value of an oil or fat may be defined as

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the number of grams of iodine taken up by 1 g of the oil or fat

the number of grams if iodine taken by 10 g of the oil or fat

the number of grams of iodine taken by 100 g of the oil or fat

none of the above

The % age of nitrogen in ammonia is:

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80%

92%

90%

50%

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

4.4 g of CO₂ contains how many litres of CO₂ at STP?

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2.4 litre

2.24 litre

44 litre

22.4 litre

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

Amino acids are bifunctional organic compounds what are the two function groups

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Carboxylic acid and alcohol

Acohol and aldehyde

Carboxylic acids and ketone

Amino group and carboxylic acid

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

The molarity of the solution containing x grams (NH₄)₂SO₄in 500 cm³of the solution is 0.6 what is x

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39.6

45.1

40.5

42.7

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

Maximum variable oxidation state is of:

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Mn⁺²

Fe⁺³

Cr⁺¹

a and b

The alkyl halide molecule on which a nucleophile attacks is called

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Substrate

Subsituent

Substituted

All of these

Zn + HCI are used in

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Clemenson reduction

Wof kishner reduction

Kolb's electrolysis

Wutruz reaction

Which of the following element is responsible for oxidation of water to O₂in biological process?

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Fe

Mn

Cu

Mo

Which compound contains - OH in their molecule

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Alcohol

Phenol

Alcohol and phenol

Ether

Number of elements present in 5th period is

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8

18

32

24

ΔH is equal to

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E + PV

E + PΔV

ΔE + P

ΔE + PΔV

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

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