Question # 1

The simplest of these has formula:

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C60

C10

V20

C30

H2O is what type of molecules it is:

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Manoatomic

Polyatomic

Pentaatomic

Nil

Neuron was discovered by

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Sir Willium Crooks

Goldstein

James Chadwik

Neil Bohr

________________ orbital is more complex in shape.

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s

p

f

d

Bucky balls are ____________ allotropic forms of carbon.

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1st

2nd

3rd

4th

The smallest under of an ionic compound is

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Atom

Formula unit

Ion

Molecule

Atoms reacts with each other because:

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They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

Which one of the following is a galvanic cell?

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Daniel cell

Nelson's cell

Down's cell

Both B and C

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

Polyatomic molecules consist of _________ atoms.

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1

More than 1

Less than 1

2

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

The reactions in which products can recombine to form reactants is called.

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Irreversible reactions

Reversible reactions

Direct reactions

Indirect reactions

Acetic acid is used for:

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Elching designs

Clearing metals

Flavouring food

Making explosives

conjugate base of HCl is:

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HCl^-

CH

Cl

NH₃

Volatility of hydrocarbons deceases with:

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decrease of molecular mass

increase of molecular mass

increase of double or triple bonds

decrease of triple bonds

Which process is responsible for ascending of water in plants from roots to leaf?

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Condensatin

Transpiration

Capillary action

Evaporation

Vibrious cholera causes.

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Choleera

Dysentery

Fluorsis

Hepatitis

When crude oil is heated in the fractionating tower:

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Vapour of higher boiling point fraction condense first in the lower part of the tower.

Vapours of lower boiling point fraction condense first in the lower part of tower.

Vapour of higher boiling point condense lather in the upper part of tower.

Vapours of higher boiling point never condense.

Which pollutant is not found in car exhaust gases?

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CO

O₃

NO₂

SO₃

Molecular formula of butane is

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C₄H₈

C₄H₁₀

C₄H₁₂

C₄H₆

Industrial effluents are highly

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Toxic organic compounds.

Inorganic salts.

Heavy metals

All of them

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

Born Haber cycle is used to determine the

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Lattice energy

Enthalpy of formation

Enthalpy of ionization

Enthalpy of dissociation

Suppose a new element 'J' has discovered and has seven electron in the valence shell. Which statement about this element would be correct.

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It is monatomic

It form covalent bond with hydrogen

It forms stable positive ion

It forms covalent bond with group IA element

Chromatography is the process which involve the distribution of a solute between

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Two mobile phases

A stationary phase and mobile phase

Two stationary and two mobile phases

Two stationary phases

If the volumes of reactants and products are same in a gaseous phase reaction, then the equilibrium state is not affected by

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Change of temperature

Change of pressure

Change of concentration

Catalyst

If salt bridge is not used between two half cells, than the voltage.

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Decreases rapidly

Decreases slowly

Does not change

Drops of zero

Boiling point of a liquid is high when

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There is no hydrogen bonding

Dipole moment is zero

Inter molecular forces are weak

Hydrogen bonding is present

Feeling uncomfortable breathing in un pressurized cabins is due to

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High pressure of CO2

Fatigue

Low pressure of O2

Low presssure of CO2

The molal boiling point constant is the ratio of elevation of boiling point to

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Molarity

Mole fraction of solvent

Molality

Mole fraction of solute

the rate of reaction when concentration of reactants are taken unity is called.

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Average rate

Instantaneous rate

Specific rate

Rate equation

Which is not use of liquid crystals.

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Temperature sensor

Liquid crystal display

Skin thermography

Energy supply in electrical devices.

Oxime is an addition product obtained when aldehydes react with.

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HCN

NH2OH

Phenyl hydrazine

H2O

The IUPAC name of C(CH3)4 is

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Iso Propyl methane

2-Methylbutane

Iso bytylmethane

2,2 dimethylpropane

Aluminium oxide is.

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Acidic oxide

Basic oxide

Amphoteric oxide

None of these

The oxide of beryllium is

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Acidic

Basic

Amphoteric

None of these

d -block elements which show anomalous configuration in first series are

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Cr and Ni

Cr and Cu

Cu and CO

Fe and Ni

Which one is used for manufacture of fertilizers

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Methane

Ethane

Ethene

Ethyne

Number of elements in the first period of the periodic table is

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2

8

14

18

Which is not polymer

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Diamond

Starch

Sand

Nucleotide

The colloidal particles in raw water can be removed by

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Coagulation

Aeration

Chlorination

Hydration

Starch is

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Monosaccharide

Disaccharide

Polysaccharide

Oligosaccharide

Which one of the following is formed when ethyne is heated in copper tube at 300 ^oC

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Ethene

Ethane

Benzene

Cyclohexane