Question # 1

A bond formed by the mutual sharing an electron pair is called.

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Ionic bond

Metallic bond

Covalent bond

Coordinate covalent bond

Covalent Bond involves the

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Sharing of electrons

Repulsion of electrons

Acceptance of electrons

Donation of electrons

When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixgure remains consant. It is called.

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Chemical Equilibrium

Static equilirbirum

Both a and b

None of the above

Numbr of hydrogen atoms present in 18 g of water.

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2 x NA

N_A

3 x N_A

1/2 N_A

Quantum means.

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Virable energy

Fixed energy

High energy

Minimum energy

Elments re classified into four blocks depending upon

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Shell

Atomic mass

Sub -Shell

Atomic Number

When molten copper and olten zinc are mixed together , they give rise to a new substnce called brass. Predict what type of bond is formed between copper and zinc.

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Ionic bond

Coordinate Covalent bond

Metallic bond

Covalent Bond

Diamond is...................

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conductor

non -conductor

both a and b

None of these

A substance formed when two or more different elements combine chemically.

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Compund

Solution

Element

Atom

All Acids turn blue litmus.

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Pink

White

Colourless

Red

Which is the correct formula of calcium phosphide.

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CaP

Ca₃P₂

CaP₂

Ca₂P₃

Chemical formula of copper glance is:

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Cu2O

Cu2S

CuFeS2

CuSO4

The substance formed during the chemical reaction are called.

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Products

Reactants

Radical

Element

If Qc > Kc the reaction will be in

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Chemical equilibrium

Static equilibrium

Reverse reaction

Forward reaction

Pitch is black residue of

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Coke

Coal-tar

Coal

Coal gas

Which hydrocarbon molecule would have no effect on the aqueous solution of bromine?

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CH₄

C₁₀H₂₀

C₂H₄

C₂H₂

Which one of the following is not faction of crude oil.

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Paraffin wax

Asphalt

Fuel oil

Petroleum coke

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

Carbonization process is the conversion of

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Coal into coal gas

Coal into wood

Wood into coal

Wood into coal tar

Alkenes are produced in large amounts by cracking of.

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Natural gas

Petroleum

Benzene

xylol

Binary compounds of oxygen such as CO2 and SO2 were names as acids by;

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Jabir Bin Hayan

Lavoisier

Al- Jahiz

Sir Humphrey Davy

In smelting process a small amount of coke is required because:

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it is highly endothermic process

it is highly exothermic process

it is very fast process

it is very slow process

In azeotropic mixture showing positive deviation from Raoult's law, the volume of the mixture is.

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slightly more than the total volume of the components

Slightly less than the total volume of the component

Equal to the total volume of the components

None of these

In Daniel cell, if salt bridge is removed between the two half cells, the voltage.

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Drops to zero

Does not changes

Increases gradually

Increases rapidly

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

The element nickel has isotopes.

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3

2

5

7

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

The line of the balmer series in the visible region of the spectrum, but the limiting line, in the series lies in

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Visible region

X-Ray region

I.R region

U.V. region

In which of the following changes, nitrogen in reduced.

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NH3 to NO

NH3 to NO3

N2 to NH3

N-3 to N2

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

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1

2

3

None of these

The molar volume of CO2 is maximum at.

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STP

127 ^oC and 1 atm

0 ^oC and 2 atm

273 ^oC and 2 atm

The number of bonds in nitrogen molecule is

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One o and oneπ

One o and twoπ

Three sigma only

Two o and twoπ

Which of the following elements is not present abundantly in earth's crust.

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Silicon

Aluminium

Sodium

Oxygen

Vinyl acetlylene reach with HCl to form

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Polycetylene

Benzene

Chloroprene

Divinylacetylene

Which enzyme is not involved in fermentation of starch.

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Diastase

Zymase

Urease

Invertase

Isopropyl alcohol on oxidation gives

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Acetaldehyde

Acetone

Ether

Propene

Elements of Groups IIA are called

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Alkali metals

Alkaline earth metals

Coinage metals

Halogens

Which gas act as 'Blistering agent'

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Acetylene

Phosphine

Phosgene

Mustard gas

The yellowish colour in photochemical smog is due to the presence of.

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NO

NO2

SO2

CO2

A snake was preserved in a solution and was placed in biology laboratory. The solution is.

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De ionized water

Fehling solution

Formalin

Chloroform

Which of the following gives acidic oxide

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N

As

Sb

Bi

Each of the following is true for white and red phosphorus except one.

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Both are soluble in CCl4

Both can be oxidized by heating in air

Both consists of same kind of atoms

Both can be converted into each other

The chemical formula of Sodium Bromite is.

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NaBrO

NaBrO2

NaBrO3

NaBrO4