Question # 1

What types of bonds are broken when water turns into steam on heating?

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covalent

permanent dipole interactions

hydrogen bonds

induced dipole interactions

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

One statement of isomorphism is incorrect

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they have different chemical properties

they have same physical properties

they have same atomic ratio

they have definite geometric shape

Carboxylic acid having three carboxyl groups are:

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Mono carboxylic acid

Di-carboxylic acid

Tri-carboxylic acid

Tetra carboxylic acid

Ester with raspberry flavor

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Amyl acetate

Isobutyl formate

Amyl butyrate

Octyl acetate

Molecular mass of PVC is (DP = 1200)

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63000

75000

75600

80,000

The cause of minamate disease is the pollution of:

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arsenic (As) into atmosphere

industrial waste having Hg

organic waste in drinking H₂O

oil spills in H₂O

Which one of the following enzymes brings about the hydrolysis of fats

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Urease

Maltase

Zymase

Lypase

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

Which of the following successive ionization energies belong to a Group ll element?

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320,600,1110,1700,5650,

577,1820,2740,1160,14800,

428,3070,4600,5860,7990

736,1451,7740,10500,13600

The cause of deviation form ideal behaviour is because

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the actual volume of gas molecules is not negligible

there is force of attraction between molecules of a gas

both a and b

none of these

Those compound which have any atom other than C as member of rings are called as

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Monocyclic

Hetrocyclic

Aliphatic

Both a and b

Glyptal polymer is obtained from glycerol on reacting with

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Malonic acid

Phthalic acid

Maleic acid

Acetic acid

The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

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Enthalpy of formation

Enthalpy of atomization

Enthalpy of neutralization

Internal energy change

The number of amino acids found in proteins that a human body can synthesize is

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20

10

5

14

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

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H₂SO₄

CuSO₄

ZnSO₄

Na₂SO₄

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

Without proper suction filtration is

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Rapid process.

Fague process.

Slow process.

Useless process.

A solution consisting of 92 grams ethyl alcohol (C₂H₅OH) 96 grams methyl alcohol (CH₃OH) 90 grams water the mole fraction and mole percent of methyl alcohol is

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0.3. 30%

0.2, 30%

0.5, 30%

0.2, 20%

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

Lysine is ______ amino acid

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Acidic

Basic

Natural

None of these

In chromatography, the point at which solvent maximum rises called:

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Solvent front

Base line

Element

Chromatogram

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