Question # 1

The pressure of 5dm³gas increase from 250 torr to 500 torr then new volume of gas

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500 cm³

375 cm³

2500 cm³

None of these

When light is exposed to a typical transition element, then electrons jumps from low orbitals to higher orbitals in

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f-orbitals

s-orbitals

p-orbitals

d-orbitals

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

One of the following is not a biopolymer,Point out that one:

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lipid

starch

diamond

protein

Which of the following gives silver mirror with ammonicaT AgNO3

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Benzyl alcohol

Benzene

Benzoic acid

Benzaldehyde

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C

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546°C

200°C

546 K

273 K

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

The ratio of most probable velocity to that of average velocity is

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π/2

2/π

√π/2

Higher the surface area available for reaction

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slower the reaction

faster the reaction

constant the reaction

lower the Ea

The bibre which is composed of at least 85% by weight of acrylonitrile is known as

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Royan fibre

Azlon fibre

Saran binre

Acrylic fibre

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

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Voltage is low

Discharge tube is not coloured

Gas does not conduct current under ordinary pressure

Temperature low

Spontaneous reaction is such in which the system decreases its ______

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Energy

Free energy

Entropy

All

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

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Isomerization

polymerization

Hybridization

Resonance

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

Ecology is a science of environment and deals specially with

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Stratosphere

Biosphere

Lithosphere

Hydrosphere

Organic compounds are soluble in all except

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Benzene

Petroleum

Ether

Water

What is chrome yellow?

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Pbo

Pb₂O

PbCrO₄

Pb₃O₄

Detergents are

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Synthetic products

Natural products

Both (a) and (b)

None of these

All the elements of oxygen family are

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Non metals

Metalloids

Radioactive

Polymorphic

Acetone reacts with HCN to form a cyanohydrin. It is an example of:

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

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