Question # 1

Optimum temperature for enzyme activity is

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125°C

37°C

40°C

100°C

[Ti (H20)6]3+ ion isin colour.

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Yellow

Blue

Violet

Red

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

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10.33 atm

9.333 atm

9.74 atm

9.2 atm

chemist was able to measure the value of lattice energy of KCI to be 690 kj/mol.

From this experiment , he concluded that:

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lattice energy of KBr is 665 kj/mol and that of Ki is 630 kj/mol

lattice energy of KBr is 765 kj/mol and that of Kl 730 kj/mol

lattice energy of KBr is 730 kj/mol and that of Ki 765 kj/mol

lattice energy of KBr is 630 kj/mol and that of kL 665 KJ/mol

The amino group in 19 alpha-amino acids is primary; only one alpha-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

The rate of E1 reaction depends upon

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The concentration of substrate

The concentration of substrate as well as nucleophile

The concentration Nucleophilic

Nature of Catalyst

Some substance are good conductors of electricity in both the solid and liquid states. These substance are generally:

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molecular solids

ionic substances

metallic substances

covalent network solids

Which isomer of C4H9Br will produce 2-methyl propane-2-ol on treatment with aqueous KOH

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n-butyI bromide

Sec-butyI bromide

Isobutyl halide

Tertiary butyl chloride

Keeping in view different factors which affect the melting point of a substance.the compound having melting point among the following is:

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LiCl

NaCl

CsCl

RbCl

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

The empirical formula of benzene is determined by

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IR spectra

U.V

Elemental analysis

NMR spectra

Polyanion formation is maximum in

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Nitrogen

Oxygen

Sulphur

Boron

From the difference between expected bond energies for the normal covalent bond and experimentally determined values Pauling calculated the values of

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Ionization potential of elements

Electron affinity of elements

Electronegativity of elements

Bond length

The amount of heat evolved or absorbed in a chemical reaction, when the molar quantities of products and reactants being the same as represented in chemical equation. is called

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Heat of reaction

Free energy of reaction

Entropy of reaction

None of these

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm, atomic weight

One gm, Equivalent

Eletrochemical equivalent

None of the above

Marble is chemically

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CaCl₂

CaCO₃

Na₂CO₃

NaHCO₃

Saturated solution of NaCl on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

The number of paper industries in Pakistan are

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30

25

35

20

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it

All valence electrons of iron are consumed

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

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