Question # 1

Transfer of electron between elements result in.

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Coordinate covalent bonding

Ionic bonding

Metallic bonding

Covallent bonding

Transition elements are

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All gases

All non metals

All Metals

All metalloids

Number of isotopes of hydrogen is

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2

5

4

3

Solubility of whcih salt increases with the increase of temperture.

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KNO3

KCL

NaNO3

All of These

Whof the following represent sand?

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NaCl

CaCO3

H2O

CH2O

Which group elements has low ionization energies.

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Halogens

Noble gases

Alkaline Earth Metals

Alkali Metals

How many elements are present in 6th period.

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2

8

18

32

The colour of hydrated copper (II) sulphate solid is.

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Black

Pink

White

Blue

According to Bronsted and Lowry concept, an acid is a substance that can donate.

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Proton

Electron pair

Neutron

Electron

Which branch of chemistry deals with the study of stars, planets, comets and interstellar space.

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Physical chemistry

Medcinal chemistry

Astrochemistry

Geochemistry

Carbon -14 is used for the

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Growth of bones

Diagonosis of goiter

Age determination of old objects

All of these

Which gas is evolved when acids react with carbonates and bicarbonates?

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Carbon monoxide

Carbon dioxide

Hydrogen

Hydrogen chloride

When NaHCO₃ is heated it forms.

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CO₂

Ca(OH)₂

CaCO₃

CaO

Which is the essential sugar found in milk?

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Maltose

Lactose

Galactose

Starch

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

|Which one is not an Arrhenius acid?

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HCl

H2SO₄

CO₂

HNO₃

Conversion of wood into coal is called.

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Carbonization

Destructive distillation

Fractional distillation

All

Ionic compounds are soluble in water due to:

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Hydrogen bonding

ion-dipole forces

Dipole-dipole forces

Dipole -induced dipole forces

Thermosphere lies beyond.

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Stratosphere

Troposphere

Mesosphere

Biosphere

Number of discovered element till today are.

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140

118

90

16

All water soluble metallic oxides have characteristic of:

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acidic

basic

neutral

amphoteric

Water dissolves non-ionic compound by

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Ion-ion forces

Ion-dipole forces

Dipole -dipole forces

Hydrogen bonding.

The process in which liquid can be made to boil at low temperature in known as .........distillation

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Simple

Thermal

Steam

Vacuum

The shape of diamond crystal is.

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cubic

Hexagonal

Tetragonal

Orthorhombic

pKa of CH3COOH is 4.74. The pKb value of CH3COO- ions will be

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7

14

9.26

zero

Select the correct answer out of the following alternative suggestions London dispersion forces are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium is gaseous state at high temperature.

Molecules of solid I2

Molecule of H-Cl gas

The Avogadro constant is the number of.

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Atoms in 1 g of helium ga

Molecules in 35.5 g of chlorine gas

Atoms in 6 h graphite

Atoms in 24 g of magnesium

27g of Al will react completely with how much mass of O2, to produce Al2O3.

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8 g of oxygen

16 g of oxygen

32 g of oxygen

24 g of oxygen

In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

Colligative properites are the properties of

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Dilute solutions which behave as nearly ideal solution

Concentrated solution which behave as nearly non-ideal solution

Both a and b

Neither a nor b

With increase in 10°C temperature, the rate of reaction double. This increase in rate of reaction is due to

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Decrease in activation energy of reaction

Decrease in the number of collisions between reactant molecules

Increases in activation energy of reactants

Increase in number of effect collisions

The pressure of oxygen inside the bomb calorimeter is.

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100 atm

50 atm

25 atm

20 atm

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

Which one of the following species is not an electrophile.

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HN3

Br

H+

BF3

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

Which statement is correct about the given reaction.

2NaOH + Cl2 --------------- NaCl + NaCIO + H2O

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Cl is oxidized and O is reduced

Cl is reduced and O is oxidized

Cl is oxidized as well as reduced

Neither Cl nor oxygen is reduced or oxidized

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

Element of which group reacts with hydrogen and form ionic hydrides.

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II A

IV A

V A

VI A

Ethanol on dehydration can be changed to

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Ethene

Diethyl ether

Both 'a' and 'b'

None of these

Alkali metal whose carbonate is is relatively less stable and decomposes giving its oxides is.

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Li

Ba

K

Rb

Which can produce ketone

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Sec alcohol

Calcium acetate

Propyne

All of these

Galvanized iron is protected by a thin layer of

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Cr

Zn

Sn

Pb

Transition elements are those

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Which becomes before uranium

Which becomes after uranium

Which are prepared artificially

Which are in between s-block and p - block elements

Which of the following sulphates is not soluble in water.

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium Sulphate