Question # 1

The earth is made up of ___________ % of iron.

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4

5

6

7

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

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

The quantity of a matter in a body is called ____________

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Mass

Weight

Atom

Molecule

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

The formula of rust is:

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Fe₂O₃,nH₂o

Fe₂O₃

Fe(OH)₃-nH₂O

Fe(OH)₃

The molar mass of H₂SO₄ is:

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98 g

98 amu

9.8 g

9.8 amu

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

The no. of periods in modern periodic table are

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7

11

18

23

The elements of group 17 are called:

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Carbon family

Noble gases

Alkaline earth metals

Halogen family

Metals are covered by using.

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Baeyer's test

Bohr's

Electrolysis

None

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

Which one is not the fraction of residual oil?

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Paraffin wax

Asphalt

Fuel oil

Coke

Which is a Lewis base?

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H⁺

NH₄

BF₃

AlCl₃

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

Reactions which have comparable amounts of reactants and products at equilibrium state have:

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very small Kc value

Very large Kc value

Moderate Kc value

None of these

Who was prepared acetic acid in laboratory?

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Berzelius

Wohler

Kolbe

Dalton

Cause of Night blindness is.

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Deficiency of vitamin B

Deficiency of vitamin A

Deficiency of vitamin D

Deficiency of vitamin E

Formula of Decane is.

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C₁₀H₂₀

C₁₀H₂₂

C₁₀ H₄

C₁₀H₁₆

Which one of the following compounds is an aldehyde?

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CH₃-CH₂-OH

CH₃-COOH

CH₃CHO

CH₃COCH₃

When the magnitude of Kc is very small in indicates.

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Equilibrium will never establish

All reactants will converted to products.

Reaction will go to completion

The amount of products is negligible

Which one of the following is not a greenhouse Effect?

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Increasing atmosphere temperature.

Increasing food chains

increasing flood risks

Increasing sea-level

Salt of weak acid with strong base when dissolved in water gives.

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Acidic solution

Basic solution

Neutral solution

None of above

Hund's rule state that when electrons enter to the same sub levels they are.

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Singly occupied with same spin

Doubly occupy with same spin

Singly occupied with different spin

Doubly occupied with different spin

In lead accumulator cathode is made up of.

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Pb

Pb coated with PbO2

PbSO4

Mixture of Pb and PbO2

Which element has highest ionization potential.

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Li

B

Be

C

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)

The bond order of N2 molecule is.

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1

2

3

4

The quantitative relationship between rate and concentration is given by.

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Law of mass action

Rate law

Both of these

Le Chatelier's principle

Buffer action can be explained by

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Common ion effect

Law of mass action

Le Chateller's principle

All above

For a given process, the heat chagnes of constant pressure and at constant volume are related to each other as.

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qp= qv

qp<qv

qp>qv

None of these

If absolute temperature of the gas is doubled and the pressure is reduced to one half the volume the gas will.

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Remains uncharged

Increase four time

Reduce to 1/4

Be doubled

Almost forward reaction is complete when value of Kc is

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very high

Very small

Neither large nor very small

No correlation

Nelson's cell is used to prepare

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NaOH

Na₂CO₃

Na metal

NaCl

The halogens ae best described by which of the following statements.

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Their outer shell is complete

Most of them are colourless

They all are oxidizing agent

They all are gases at room temperature

Which one of the following gases is used for artificial ripening of fruits.

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Ethene

Ethyne

Methane

Propane

Phosphorus helps in the growth of

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Root

Leave

Stem

Seed

Which substance is used to convert alcohol to alkyl halide.

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SOCl2

PCl3

HCl +ZnCl2

All of these

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

Which oxide is amphoteric in nature.

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BeO

MgO

CaO

BaO

Which one of the following acids acts as oxidizing agent but never a reducing agent.

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HCIO

HCIO2

HCIO3

HCIO4

SN1 reaction usually occurs in

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All of these

Which of the following enzymes brings about the hydrolysis of fats

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Urease

Maltase

Zymase

Lipase