Question # 1

When a reaction proceeds in a sequence of steps, the overall rate is determined by

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Fastest step

Slowest step

Order of different steps

Molecularity of all steps

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dm⁺⁶mole^-2

mole²dm^-6

Mole dm^-3

Having no units

One of the following substances is not used as a drying reagent in a desiccator

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Cons. H₂SO₄

P₂O₅

Silica gel

50% KOH

Which of the following particles would on losing an electron has its outermost p-orbital as half filled

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Nitrogen atom

O⁺ion

P^-1ion

S⁺¹ion

Which one of the following statements is incorrect.

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Enzymes are protein in nature

Enzymes are catalyst

Enzymes can catalyze any reaction

Urease is an enzyme

In lead accumulator cathode is made up of.

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Pb

Pb coated with PbO2

PbSO4

Mixture of Pb and PbO2

A molecular orbital can accommodate maximum electron

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2

6

8

10

Orbitals having same energy are called

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Hybird orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Standard enthalpy change when one mole of compound is formed from their elements at standard state is.

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Heat of formation

Standard heat of formation

Heat of combustion

Standard Heat of neutralization

Which formula will be used to determine the number of in electrons sub shell of an atoms.

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2(l+1)

2(2l+1)

(l+1)

(2l+1)

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

If the electron in a hydrogen atom drops from n = 6 to n =4 level, the radiation emitted is in which series of lines in the spectrum of atomic hydrogen.

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Lyman

Balmer

Paschen

Brackett

Quantum number values for 2p orbitals are

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n = 2, l = 1

n =1, 1 = 2

n =1, l = 0

n = 2, l = 0

Bond energy depends upon

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Electronegativity

Size of atom

Bond length

All of these

The number of Na, ions which surround each CI^1-ion the NaCI crystal lattice is

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8

12

6

4

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