Question # 1

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

Which of the following statements is false?

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Avogadro number = 6.02 x 10²¹

The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u

The mean kinetic energy of an ideal gas is independent of the pressure of the gas

The root mean square velocity of the gas can be calculated by the formula (3RT/M)^1/2

Keeping in view the charge density select the compound amoung the following having highest lattic energy:

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LiBr

KCI

MgO

NaF

The temperature in the incineration process has a range:

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900 to 1000°C

650 to 1100°C

950 to 1300°C

500 to 900°C

Reason for the rancidity of fat is

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Low sponification

High reactivity of fat

Oxidation of fat

All

The substances which soften the polymer are called

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stabilizers

plasticizers

retarders

pigments

The destruction of the biological nature and activity of proteins by heat or chemical agent is called:

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Dehydration

Oxidation

Denaturation

Polymerization

The weakest intermolecular forces present in a liquid may be

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Dipole-induced dipole forces

dipole-dipole forces

instantaneous forces

electrostatic forces between ions in a ionic solid

Second order of protein structure refers to

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Number and sequence of amino acids

Three dimensional structure of protein

Proteins formed of more than one monomer

Bending of protein molecule

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

The reason of acid rains is

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Release of CO in excess by in complete combustion

Excess release of NO₂and SO₂from buring of fossil fules

Formation of excess CO₂due to combustion and respiration

Formation of NH₃in excess from industry and coal gas

Polysaccharides are also called

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Crystals

Sugars

Liquids

None sugars

The geometry of [Co(NH₃)₆]³⁺is

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Tetrahedral

Square planar

Octahedral

None of these

Alkene general formula :

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C_nH_2n+2

C_nH_2n

C_nH_2n-2

C_nH_2n+1

Saponification of ethyl benzoate with caustic soda

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Benzyl alcohol,ethanoic acid

Sodium benzoate, ethanol

Benzoic acid, sodium ethoxide

Phenol, ethanoic acid

When sulphur is boiled with Na₂SO₃solution, the compound formed is

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Sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

How many moles of oxygen, O₂are needed for the complete combustion of two moles of butane C₄H₁₀?

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2

8

10

13

The color of Cr³⁺ion is

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Violet

Blue

Pink

Green

Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

An orbital can accommodate maximum two electrons with opposite spins according to

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Heisenberg's principle

Aufbau principle

Hund's srule

Pauli exclusion principle

Which behaves as insulator for animals body?

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Carbohydrates

Proteins

Fats

Skin

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