Question # 1

When an electronegative element combines with electrpositive element, the type of bonding. is.

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Covalent

Polar Covalent

Ionic

Coorinae Covalent

d- subshell can accommodate maximum electrons.

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2

6

10

14

When a reaction will be come a reversible one?

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If the actvation eneryg of the forward reaction is comparrble to that of backward reaction

If the activation energy of the forward reaction is higher than that of backward reaction

If the activationenergy of the forward reaction is lower than that of backward reaction

If the enthalpy change of both the reactions is zero.

Washing clothes at 140 ^oF uses almost the energy as at 140 ^oF wash

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Half

Thrice

Twice

None of the above

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

Which element has the highest melting point.

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K

Cs

Na

Rb

The mass of one molecule of water is.

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18 g

18 mg

18 kg

18 amu

How many periods are present in the modern periodic table

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7

8

10

12

How many atoms are present in one gram of H2O?

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1002 x 10²³ atom

6.022 x 10²³atom

0.334 x 10²³atom

2.004 x 10²³atom

How many electons can be accommodated in S subshell?

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2

6

14

10

Whcih of the following atoms obey duplet rule.

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O₂

Cl₂

H₂

Li₂

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Which is the natural sugar found in starchy food.

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Pentose

Dextrose

Hexose

All of them

ozone depletion (i.e O3--------------> O2 + O) occurs in:

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lower stratosphere

middle stratosphere

upper stratosphere

troposphere

The color of Iodine is:

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Purple

Black

Red

Pink

How many times the heat capacity of water is greater than that of rocks.

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Two

Three

Four

Six

Ozone is an allotropic form of

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Carbon

Oxygen

Sulphur

Phosphorous

Inland water includes.

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River

Lakes

Streams

All of them

Lipids are macromolecules made up of.

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Fetty acids

Amino acids

Nucleotides

None of them

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO

CO₂

CO₃

Coal gas is mixture of

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CO and CH₄

CO . CH₄. CO₂

CO, CH₄, H₂

CO, H₂ and CO₂

Fertilizers are used to make up the deficiency of;

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oxygen and carbon

iron and magnesium

nitrogen and phosphorus

hydrogen and calcium

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

When an atom reacts chemically and loses one or more electrons it is.

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Decomposed

Reduced

Oxidized

Catalyzed

The enthalpy of combustion is

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Positive

Negative

Either positive or negative

No correlation

A solution has pH zero. Its H+ ions concertation will

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zero

More than unity

Less than unity

Unity only

How many electrons can be accommodated in sub shell for which n = 3, l = 1

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6

8

18

32

Ionic solid are characterized by.

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Low melting point

Good conductivity in solid state

High vapours pressure

solubility in polar solvent

An Ideal gas can not be liquefied because.

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Its critical temperature is always above 0 ^oC

It molecules are relatively smaller in size

Its solidify before becoming a liquid

Force operative between its molecules are negligible

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

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

For a gas obeying Boyle's law if pressure is doubled, the volume becomes.

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Double

One half

Four times

Remains constant

X- rays have same nature as

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Alpha rays

Beta rays

Gamma rays

Cathods rays

Which one of the following salts dissolved in water to form a solution with a pH greater than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

Venyl acetylene combines with HCl in

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Polyacetylene

Benzene

Chloroprene

divinyl acetylene

Aromatic hydro carbon are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

Vegetable oils are

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Polyesters

Glycerides of unsaturated fatty acids

Essential oils

Fatty acids

Which of these polymers is a synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

To product aldehyde group against alkaline oxidizing agent.

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It is reduced in the presence of catalyst

An acetal is formed

It is oxidized

It is treated with aqueous NaBH4

Catalyst used to reduce carboxylic acid to alcohol is

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H₂/ Ni

H₂/ pt

NaBH₄

LiAIH₄

In which country first of all paper was invented

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USA

China

Egypt

Germany

Which woody raw material is used for the manufacture of paper pulp

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Cotton

Biogases

Rice straw

Poplar

----------- compound shows extensive hydrogen bonding with water

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C₂H₆

H₂S

C₂H₅OH

CH₃Cl

Which of the following is Ortho and Para directing group

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-I

-CHO

-COR

-NH₂

The general representation for Grignard reagent is.

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RMgX

ReMgX

RXMg

RMgX2