Question # 1

Which of the following does not happpen, when a system is at equilibrium state.

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Reaction continues to occur in both the directions

Concentration of reactants and products stop changig

Forward and reverse reactions stop

Forward and reverse rates become equal

How many hydroxide ions, calium hydroxide will release in water.

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2

1

3

zero

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

Whcih one of the following wil show negligible effect of termperture on its solubility.

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KCl

KNO3

NaCl

NaNO3

Which of the following contains oxalic acid

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Orange

Sour Milk

Tomato

Tamarind

Which one of the example of colloid.

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Paints

Milk of magnesia

Jelly

None of these

d- subshell can accommodate maximum electrons.

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2

6

10

14

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

Atoms achieve stability by attainign electonic configuration of.

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Alkali metals

Coinage metals

Inert Gases

Alkaline earth metals

Metal have the tendency to lose elecrons due to.

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High ionization energies

Low ionization energies

Low electron affinity

None of the above

When the tiny particles of a substance are dispersed athough a medicium, the mixture is named as.

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True solution

Suspension

Colloid

Heterogeneios mixture

___________ is not mineral acid.

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HCl

CH₃COOH

H₂SO₄

HNO₃

Which of the following is tasteless?

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Starch

glucose

Fructose

Sucrose

Which acid is used for etching glass?

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HF

HCl

HBr

HI

Which is a Lewis base?

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H⁺

NH₄

BF₃

AlCl₃

In which of the following groups , oxygen is attached on both sides with carbon atoms.

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Ketone group

Ether group

Aldehyde group

Easter group

Margarine is produced by adding hydrogen to vegetable oil at.

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2000 ^oC

100^oC

200^oC

1000^oC

The strong heating of coal in retoris in the absence of air is called.

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Fractional distillation

Sublimation

Roasting

Destructive distillation

Which one of the diseases causes severe diarrhea and can be fatal?

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Jaundice

Dysentery

Cholera

Typhoid

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

Neurological damage is caused by the poisoning of.

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Lead

Cadimium

Mercury

All of them

Word "acid" derived from:

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Urdu

English

Latin

Greek

What is oxidation state of chlorine in Ca(ClO3)2

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+1

+3

+5

+7

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

Allotropy is the property of.

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Compound

Element

Atom

Mixtuer

The number of electrons in one mole of hydrogen gas is.

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6.02 x 10²³

12.04 x 10²³

Only two

Indefinite

The Van der Waals' equation explain the behaviour of.

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Ideal gas

Real gas

Vapours

Non ideal gases

Which of the following orbitals is not possible.

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3p

4s

2d

Is

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

Standard enthalpy of combustion of carbon is -394 kJ mol-1 than, which is the standard enthalpy of formation of CO2

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+394 kJ

-394 kJ

0 kJ

+197 kJ

One of the following statements about Born-Haber cycle is correct. Which is that statement

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Born-Haber cycle is different from Hess's law

The energy change in a cyclic process is not zero

The lattice energy of the crystalline substances can be calculated easily

Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously

Crystal to diamond is.

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Ionic

Molecular

Covalent

Metallic

Which of the following molecule obey octet rule.

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BF3

BCl3

NH2

SF6

Which of the following is an addition polymer

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Polyester

Polystyrene

Nylon 6,6

Terylene

When methane reacts with Cl2 is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

Aluminium is used for making petrol and milk storage tanks because it is

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Conductor

Non magnetic

Excellent reflected

Corrosion resistant

NH4NO3 on heating at 200 ^oC changes to

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N2O

NO

NO2

N2O4

What is effect of solubility of carboxylic acid in water by increasing their molecular masses.

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Decreases

Increase

Remain constant

Non effected

The state of hybridization in ethene molecule is

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dsp²

sp³

sp²

sp

Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution.

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Na

Cr

Mg

C

Iodine deficiency in diet is known to cause.

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Beri Beri

Goiter

Rickets

Night blindness

Acetic acid can be obtained from CH3MgI by treatment with.

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H2O

CINH2

CO2

HCHO

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

f - block elements are also called.

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Non typical transition elements

Outer transition elements

Inner transition elements

None of true