Question # 1

Milk of magnesia contains Mg(OH)2 It is used as antacid It neutralizes excess stomachaacid. Which salt is formed in this reaction.

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MgCl2

MgSO4

MgCO3

MgO

When a chemical reaction is carried out with a substancZ; a gas is produced which turns red litmus paper blue. What is the reaction?

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Reaction of an acid with a meal carbonate

Reactin of an alkali with ammonium salt

Reaction of an acid with ammonium salt

None of these

The crystals of whic substance has rhombic shape?

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Brass

Bronze

Sulphur

Grahite

How many covalent bonds does C₂H₂ molecule have.

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Two

Three

Four

Five

How many state of matter exist.

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One

Two

Three

Four

When we mvoe form left to right in a period, atomic size.

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Increases

Decreases

First increases then decreased

None of the above

Number of moels in 29.25 g NaCl is.

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0.50

0.25

0.21

0.75

All chemical reaction involves.

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Enzymes

Catalyst

Energy changes

All of these

You are styding the rate of hydrolysis of organic compund staarch under different conditonns of temperature. In which branch of chemistry this topic will fall

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Organic Chemistry

analytical chemistry

Biochemistry

Physical Chemistry

Following are state of matter.

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Liquid

Solid

Gas

All of these

4th and 5th priod of the long form of periodic table are called.

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Short periods

Normal periods

Very long peiods

Long periods

Chlorine has two isotopes, both of which have

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Same mass Number

Same number of electrons

Same number of neurtons

Different number of protons

The enthalpy of reaction 2H2 +O2-----2H2O

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-571.6 kJ

-110.5 kJ

-393.5 kJ

+53.8 kJ

The branch of chemistry that focuses on the study of polymers, their types properties, uses is called.

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Industrial chemistry

Polymer chemistry

Organic chemistry

Astrochemistry

Which one of the followign halogns has highest electronegativity

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Iodine

Fluorine

Chlorine

Bromine

Runcid butter has

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Foul smell

Rotten egg smell

Pungent smell

No smell

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

The process of removing temporary hardness of water.

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Clark's method

Washing soda method

Sodium zeolite

Filteration method

Natural gas contains.

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Methane

Ethane

Propane

All

A salt always

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Contain ions

Contains water of crystallization

Dissolves in water

Forms crystals which conduct electricity

Temporary hardness in water can he removed by.

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Boiling Method

Using washing soda

Using sodium zeolite

All of them

Word "acid" derived from:

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Urdu

English

Latin

Greek

For which reaction Kf is the rate constant?

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Forward reaction

Backward reaction

Upward reaction

Downward reaction

The color of Fe(OH)₂ ppt is.

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White

Brown

Muddy green

Blue

Which one of the following is not a fraction of petroleum?

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Kerosene oil

Diesel oil

Alcohol

Petrol

Coal having 90% carbon contents is called.

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Peat

Lignite

anthracite

bituminous

Composition of carbon in kerosene oil is.

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C₁₀-C₁₂

C₁₂-C₁₂

C₁₆-C₁₈

C₃₀-C₃₀

Which one is the simplest sugar which can not be hydrolyzed?

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Glucose

Sucrose

Starch

Cellulose

Acetic acid is used for:

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Elching designs

Clearing metals

Flavouring food

Making explosives

Which type of reactions take place in both directions?

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Addition reactions

Reversible reactions

Irreversibel reactions

Decomposition reactions

"The components of which mixture can be separated by filtration".

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NaCl and CaCl2

Calcium carbonate and NaCl

Blue and green inks

Sand and naphthalene

Relative lowering of vapour pressure is equl to.

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Mole fraction of solute

Mole fraction of solvent

Molarity

Molality

Which mixture of gases is used by the deep sea divers.

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Oxygen and nitrogen

Oxygen and helium

Oxygen and carbon di oxide

Oxygen and water vapours

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

Many elements have fractional atomic masses. This is because

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The mass of the atom is itself fractional

Atomic masses are average masses of isobars

Atomic masses are average masses of isotopes

Atomic masses are average masses of isotopes proportional to their relative abundance

More abundant isotope of an element is the one with.

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Even atomic number

Odd atomic number

Even mass number

Odd mass number

Which molecule has sG2 hybridization.

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CH4

C2H4

C2H2

C2H5

Equal masses of methane and oxygen are mixed in an empty container at 25°C, the fraction of total pressure exerted by oxygen is

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1/3

8/9

1/9

16/17

Which of the following particles would on losing an electron has its outermost p-orbital as half filled

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Nitrogen atom

O⁺ion

P^-1ion

S⁺¹ion

Safe and reliable method of drying crystals is through.

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Pressing it between folds of filter paper

Drying it in oven

Evaporation of solution

Vacuum desiccator

A component having small value of K mostly remains in the.

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Stationary phase

Mobile phase

Chromatographic tank

Solvent

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 moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

If the empirical formula of compound is CH2 and its molecular mass is 56 than what is the actual molecular formula of this compound.

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CH2

C2H4

C3H6

C4H8

Which of the following acids possess oxidizing and reducing properties.

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HCl

HNO2

HNO3

H2SO4

f-block elements are also called

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non typical transition elements

outer transition elements

normal transition elements

inner transition elements

The reaction between fat and NaOH is

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Estrification

Hydrogenolysis

Fermentation

Saponification

Which is simplest amino acid

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Alanine

Protein

Lysine

Glycine

Which one of the following compounds is most abundant is nature.

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glucose

Starch

Cellulose

Fructose

Which substance is formed by the catalytic oxidation of methane at 100 ^oC, 200 atmospheric pressure and copper catalyst

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Methanol

Methanal

Methanoic acid

All of these

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

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Hund's rule

Markownikov's rule

Pauli's Exclusion Principle

Aufbau Principle

On heating aldehydes with Fehling's solution we get a precipitate whose colour is

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Pink

Black

Yellow

Brick red

Which one of the following methods is used for the preparation of ether.

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Kolbe's reaction

Frankland reaction

Williamson synthesis

Down's process

Colour of K2Cr2O7 is

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Red

Orange

Green

Yellow

The word alkali is derived from which language

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Arabic

Greek

French

German

Which compound will have maximum repulsion with H2O

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C6H6

C2H5OH

CH2CH2CH2OH

CH5-O-OH3

In [Co(NH3)6]+3 the coordination number of cobalt is.

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Zero

Two

Four

Six

The aqueous solution of which substances is green in colour

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K2CrO4

K2CrO7

KMnO4

K2MnO4

How much does of methanol can cause death

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10-15 ml

15-20 ml

100- 250 ml

has no effect