Question # 1

Stochiometric calculators are used to prepare.

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Soaps

Shampo

Perfumes

All of these

Period nuber of ²⁷ Al ₁₃ is

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1

2

3

4

What will be the relative atomic mass of nitrogen given the abundance of its two isotopes, ¹⁴ N and ¹⁵N are 99.64 and 0.35

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14.0210

14.2100

14.0021

14.1200

John Dalton put forward his atomic theory.

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1800

1803

1805

1903

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

A nceklaee has 6 g of diamonds in it . What are the numberof carbon atoms in it?

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3.01 x 10²³

1.003 x 10²³

12.04 x 10²³

6.02 x 10²³

Metals are teh elements which have.

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Electronegative character

Electropositive character

Both a and b

None of the above

Which of the following element belong to VIII A.

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Xe

Mg

Br

Na

Which branch of chemistry helps to protectwater that bas been poisoned by soil.

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Organic chemistry

inorganic chemistry

Environmenal chemistry

Geochemistry

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

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

Which one of the following does not contain proteins.

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In pulses

In Potatoes

In fruits

In eggs

At the time of partition, How many industries wee present in Pakistan.

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30

32

34

40

Which one the following is more reactive?

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Methane

Ethane

Ethene

Acetylene

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

Which one Ion is not present in salt.

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Metallic cation

Anion of Base

Anion of acid

None metallic anion

Uric Acid is present in

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Apple

Fats

Urine

Grapes

The formula which represents the actual number of atoms in one molecule of organic compound is called.

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Molecular formula

Structural formula

Condensed formula

Dot and cross formula

The percentage of SO₂released by the combustion of coal and petroleum product.

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40%

60%

70%

80%

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

Marsh gas is mostly consisted of.

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Butane

Propane

Ethane

Methane

Acidic solutions have pH value.

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Less than 7

Greater than 7

equal to 7

None of these

If an endothermic reaction is allowed to take place very rapidly i the air, the temperature fo the surrounding air.

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Remains constant

Increase

Decrease

Remain unchanged

The sum of all kinds of energies of atoms, ions or molecules of a system is known as.

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Kinetic energy

Potential energy

Internal energy

Solar energy

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

Energy and wavelength of a photon are related as.

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Direct

In direct

No correlation

Inverse under root

In endothermic reactions, the heat content of the.

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Products is more than that of reactants.

Reactants is more than that of products

Both a and b

Reactants and products are equal

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

How many atoms are present in half mol of oxygen gas. Gas exist in diatomic state.

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3.01 x 10²³

6.02 x 10²³

2 x 10²³

1.003 x 10²³

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

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zero

More than unity

Less than unity

Unity only

Chromatography in which the stationary phase is a solid is classified as.

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Partition chromatography

Gas chromatography

Adsorption Chromatography

Thin layer chromatography

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone.

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Primary alcohol

Secondary alcohol

Tertiary alcohol

Dehydrin alcohol

Formalin is a 40% solution of

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CH₃CHO

CH₃OH

HCHO

CH₃OCH

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

The smog which have high contents of SO2 in it, is called.

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Reducing smog

Oxidizing smog

Natural smog

Neutral smog

In which one of the following sets do all three particles have same number of total electrone

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F- ,Cl-,Br-

Li+ , Na+ , K+

N^--3, O-2, F-,

Na+, Mg+2, K+

Rectified spirit contains alcohol about

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80%

85%

90%

95%

Grignard reagent is reactive due to

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The presence of halogen atom

The presence of Mg atom

The polarity of C -Mg bond

None of the above

Acetone reacts with HCN to form cyanohydrin it is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic subtitution

Which one of the following compounds of lead is red in colour

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PbO

Pb2O

Pb3O4

PbCO3

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere