Question # 1

How many periods are presnet in the modern periodic table.

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7

8

10

12

A state of matter whose properties are between those of liqids and crystalline solids.

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Plasma

dark matter

Liquid crystal

Supercriticl fluid

Number of electrons that an be accomodated in f - subshell

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6

10

2

14

Whcih is true about the equilibrium state?

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The forard reaction stops

Both forward and reverse reactions stop

Both foward and reverse reactions continue at the same rate

The reverse reaction stops

All transition elements belong to

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s and p block

d- block

f-block

d and f block

What information was obtained fom discharge tube expriments?

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Electrons and protons were discovered

Structur eof atom was discovered

Neutrons and protons were discovered

Presence of nucleus in an atom was discovered

Atomic number of actinium is

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57

60

89

80

Why is H₂Oa liquid while H₂S is a gas?

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Becuase in waer, the atomic size of oxygen in smaller than that of Sulphur

Because water can easily freeze into ice

Because water is a polar compound ad tere exists strong forces of attrction betwene its molecules

Because H₂O molecule is lighter than H₂S

1- gram atom of carbon contain hwo many moles.

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1 mole

2 mole

6 moles

12 moles

Hazardous effects of shopping bags are studied in

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Geochemistry

Inorganic chemistry

Environmental chemistry

analytical chemistry

Which branch of chemistry give information about starch syntehsis in plants?

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Biochimstry

Organic chemistry

Environmental chemistry

Inorganic Chemistry

Main component of natural gas is

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Methane

Propane

Butane

Propene

All acids turn blue litmus.

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Red

Blue

Pinck

White

Chalco-Pyrite is an ore of:

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Copper

Silver

Iron

Aluminium

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

Incomplete combustion of alkanes produce.

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Carbon dixoide only

Carbon monoxide only

Carbon monoxide carbon black and water

Carbon dioxide and carbon black

All water soluble metallic oxides have characteristic of:

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acidic

basic

neutral

amphoteric

___________ is not an acid:

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HCl

NH₃

H₂CO₃

H₂SO₄

Which one is used for alkaline batteries?

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NaOH

Ca(OH)₂

KOH

Mg(OH)₂

Sodium carbonate is manufactured by.

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Haber's process

Ostwald's process

Solvay's process

All

Composition of carbon in kerosene oil is.

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C₁₀-C₁₂

C₁₂-C₁₂

C₁₆-C₁₈

C₃₀-C₃₀

Which are called paraffines?

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Alkyle

Alkynes

Alkenes

Alkanes

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

The unit of rate constant is same as that of rate of reaction in

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first order reaction

Second order reaction

Third order reaction

Zero order reaction

When a chemical reaction is completed.

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

Vapour pressure of liquid depends upon

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Amount of liquid

Surface area

Temperature

Size of container

How many sigma and pi bonds are present in C2H2.

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one sigma and two pi

two pi and one sigma

Two pi and three sigma

Three pi and two sigma

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

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Forward

Reverse

Neither forward nor reverse

Equally move in both direction

Which of the following contains the same number of molecules as 9 g of water.

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2 g of hydrogen gas

14 g of nitrogen gas

32 g of oxygen gas

44 g of carbon dioxide gas

In solvent extraction, solute can be separated from solution, by shaking the solution with solvent in which the solute is.

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More soluble

Partially soluble

Insoluble

soluble at high temp

The cell in which a non spontaneous redox reaction takes place as a result of electricity is known as.

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Voltaic cell

Denial cell

dry Cell

Electrolytic cell

In which of the following Paris, do the elements form a compound by sharing electrons.

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carbon and chlorine

Lithium and iodine

Neon and oxygen

Potassium ad bromine

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

The oligosaccharides contain number of hexose unit.

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2 to 7

2 to 8

2 to 9

2 to 100

Effect of substituent on benzene ring is due to

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Resonance

Inductive effect

Both a and b

Neither a nor b

Which of the following are mono-saccharides

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Fructose

Sucrose

Stach

Cellulose

During nitration of benzene, the active nitrating agent is

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NO₃

NO₂⁺

NO₂^-

HNO₃

Methyl alcohol can be distinguished from ethyl alcohol by

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Action of Cl2

Action of NH3

Dissolving in H2O

NaOH +I2

Which electronic configuration corresponds to an element of group III-A of the Periodic Table

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1s²,2s²,2p⁶,3s²,3p¹

1s²,2s²,2p⁶,3s²,3p⁶,4s⁶

1s²,2s²,2p⁶

1s²,2s²,3s²,3p³

Which one is not an argillaceous material.

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Clay

Shale

State

Gypsum

The main pollutant of leather tanneries in the waste water is due to

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Lead

Chromium VI

Copper

Chromium III

Which statement is incorrect about H2SO4

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Dehydration agent

dibasic acid

Oxidizing agent

Reducing agent

Which property of hydrogen not resemble to alkali metals.

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Electronic configuration

Oxidation state

Reaction with halogen

Metallic nature

A cyanohydrin is formed by the reaction of

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Alcohol and HCN

Ketone and NH3

Aldehyde and NH2OH

Aldehyde and HCN