(CAR) Chemistry

Question 1

_____ gas is used for extinguishing Fire

Answer 1

Carbon Dioxide

Question 2

Strains of rust from iron on cloth can be removed by

Answer 2

Oxalic Acid

Question 3

Cooking gas is a mixture of ____ gas

Answer 3

Oxygen and methane

Question 4

On addition of salt to water

Answer 4

its boiling point increases

Question 5

_____ gas doesnt pollute air

Answer 5

Nitrogen Dioxide

Question 6

The inorganic natural resource of the earth is

Answer 6

Mineral Fuels

Question 7

____ has the highest fuel value

Answer 7

Hydrogen

Question 8

___ and ____ group of compounds constitute carbohydrates

Answer 8

Starch and Sugar

Question 9

Chemical Name of Baking Soda

Answer 9

Sodium Bicarbonate

Question 10

Milk lacks in one imp nutrient

Answer 10

Iron

Question 11

Ripening of fruits hastened by ____ gas

Answer 11

Ethylene

Question 12

Iron articles rust coz of

Answer 12

A mixture of ferrous and ferric hydroxide

Question 13

Gunpowder consists of

Answer 13

75% potassium nitrate + 10% charcoal + 15% sulphur

Question 14

X-rays are produced when a stream of electrons in an X ray tube

Answer 14

Strikes metal target

Question 15

In the periodic table, elements have been arranged

Answer 15

In order of increasing atomic number

Question 16

Atom bomb is based on the principle of

Answer 16

Nuclear Fission

Question 17

Oxidation involves

Answer 17

Loss of electrons

Question 18

the substances are radioactive, which have

Answer 18

Nuclei with less number of neutrons

Question 19

In a hydrogen bomb, hydre ogen is converted into

Answer 19

Helium

Question 20

When two ice cubes are pressed over each other they unite to form one cube. Which of the following force is responsible for holding them together ?

Answer 20

Hydrogen bond formation

Question 21

The high boiling point of water is due to

Answer 21

Hydrogen bonding among water molecules

Question 22

Joule Thompson Effect?

Answer 22

The cooling caused by the of a compressed gas below its inversion temperature without doing external work

Question 23

Sea water is converted into fresh water by using phenomenon of

Answer 23

Reverse Osmosis

Question 24

Smoke is an example of

Answer 24

Solid dispersed in gas

Question 25

Milk can be preserved by a few drops of

Answer 25

Formaldehyde solution

Question 26

Detergent action of soap and synthetic detergents is due to their

Answer 26

Emulsifying proerties

Question 27

Digestion of fats in the intestines is aided by

Answer 27

Emulsification

Question 28

The reaction taking place at anode and cathode are ?

Answer 28

Oxidation, Reduction

Question 29

During electrolysis, metals are deposited at the cathode, because

Answer 29

the cathode supplies electrons

Question 30

Heavy water is known as heavy coz

Answer 30

It is an oxide of deuterium

Question 31

Most of known elements are

Answer 31

Metals

Question 32

Stainless steel does not rust coz

Answer 32

Chromium forms an oxide layer that protects iron rusting

Question 33

The engines of the rockets that helped the Apollo II spacecraft to land on the moon used for rocket fuel power?

Answer 33

Hydrazine

Question 34

Many people died in Lonadon in 1952 as a result of air pollution caused by

Answer 34

smog

Question 35

Fluorocarbons are effective scavenger for ozone due to

Answer 35

Photolytic decomposition of O3 into CI and O2

Question 36

Detergents are better than soap coz

Answer 36

They are less affected by hard water

Question 37

Chemically, Soap is

Answer 37

Salt

Question 38

Lipids are

Answer 38

Long chain of fatty acid esters

Question 39

Firdous Al Hikmat Fe Ilmul Kemia was written by

Answer 39

Khalid bin Yazeed

Question 40

Ammonia was obtaned from Urine by

Answer 40

Friedrich Wöhler

Question 41

Madam Curie is famous for his work in the feild of

Answer 41

Nuclear Chemistry

Question 42

Who was first to prepare sulphuric Acid

Answer 42

Jabir Bin Hayan

Question 43

Dalton's atomic theory gave the concept of

Answer 43

Valency

Question 44

When radioactive rays are passed through air or any gas, they caused to

Answer 44

Ionize

Question 45

the elements in the first period of the peroidic table are

Answer 45

Hydrogen and Helium

Question 46

The reason for chlorinating water is

Answer 46

To kill germs

Question 47

Condensation

Answer 47

Cooling of vapours of some compounds change them directly in to solid state

Question 48

carbonated drinks are example of

Answer 48

Gas in water

Question 49

Fog is an exmaple is

Answer 49

Liquid in gas

Question 50

The common battery used in automobiles is

Answer 50

Lead storrage battery

Question 51

____ acid present in sour milk

Answer 51

Formic Acid

Question 52

The water that can produce good lather with soap is known as

Answer 52

Soft water

Question 53

____ is the purest form of carbon

Answer 53

Diamond

Question 54

In colourful diamond, diff colours are present due to

Answer 54

Impurities

Question 55

Ozone present in ____ and ____ layers of atmosphere

Answer 55

Troposhere and Stratosphere

Question 56

In Pak and other countries ____ method is used in manufacture of sulphuric acid

Answer 56

Contact process

Question 57

The process of smelting and cooling converts pig iron into

Answer 57

Cast Iron

Question 58

Pure Iron is obtained by the reduction of _____ in the blast furnance

Answer 58

Iron Oxide

Question 59

Methane is used in daily life with the name of

Answer 59

Natural Gas

Question 60

When electricity is passes through neon it glows

Answer 60

Red

Question 61

Argon and _____ gas is used in various types of flourescent and phototubes

Answer 61

Biological Catalyst

Question 62

Atomic weight of Uranium is

Answer 62

238

Question 63

_____ is in liquid state at normal room temperature

Answer 63

Mercury

Question 64

_____ gas is used in cigarette lighters

Answer 64

Butane

Question 65

Liquefied pertoleum gas (LPG) consists of

Answer 65

Butane and Propane

Question 66

_____ is fire resistant

Answer 66

Asbestos

Question 67

____ is used for silvering of mirrors ?

Answer 67

Silver Nitrate

Question 68

Raw materials used for Manufacture of glass are

Answer 68

Sand/ Soda/ Limestone

Question 69

Solder is an alloy of

Answer 69

Tin and Lead

Question 70

Why does milk curdle

Answer 70

Fermentation of lactose

Question 71

In vulcanisation, natural rubber is heated with

Answer 71

Sulphur

Question 72

Dialysis is used for people with defective kidneys. It involves the process of

Answer 72

Osmosis

Question 73

The substance coated on plastic tape-recorder tapes is

Answer 73

Iron oxide

Question 74

Which form of phosphorus is used in safety matches ?

Answer 74

Red Phosphorus

Question 75

Permanent hardness of water can be removed by

Answer 75

Adding Washing Soda

Question 76

The first synthetic fibre made by man was

Answer 76

Nylon

Question 77

Gypsum is added to cement clinker to

Answer 77

Decrease the rate of setting of cement

Question 78

Production of chlorofluorocarbons (CFC) gas is used in which of the domestic products

Answer 78

Refrgierator

Question 79

In fireworks, the green flame is produced coz of

Answer 79

Barrium

Question 80

Mixture of two metals is called

Answer 80

Alloy

Question 81

Dynamite was discovered by

Answer 81

Alfred Nobel