Chemistry Pinoybix

Question 1

Beryllium Sulphate is less soluble in water due to ?

(a) High inflammable energy

(b) Low Energy of dissociation

(c) Low inflammable energy

(d) ionic band

Answer 1

(a) High inflammable energy

Beryllium sulfate (BeSO₄) is less soluble in water due to the high lattice energy of the BeSO₄ crystal and the hydration energy associated with the small size and high charge density of the Be²⁺ ion.

Question 2

What is the name of that system which uses radioactivity to decide the period of materials of pre his tone period ?

(a) Radium dating

(b) Uranium dating

(c) Carbon dating

(d) Deuterium dating

Answer 2

(c) Carbon dating

Question 3

Cement is made hard with

(a) dehydration

(b) hydration and dissociation of water

(c) Dissociation of water

(d) Polymerisation

Answer 3

(b) hydration and dissociation of water

Question 4

What happens when a chemical bond is formed?

(a) energy is always absorbed

(b) energy in always released

(c) more energy is released than is absorbed

(d) energy is neither released nor absorbed

Answer 4

(a) energy is always absorbed

Question 5

Which among the following is a carbohydrate?

(a) Nylon

(b) Cane sugar

(c) Turpentine

(d) Hydrogen peroxide

Answer 5

(b) Cane sugar

Question 6

In which of the following states maximum iron ore is found ?

(a) FeC03

(b) Fe203

(c) Fe304

(d) FeS2

Answer 6

(b) Fe203

Fe₂O₃ is known as hematite, which is the most abundant form of iron ore on Earth. Hematite contains about 70% iron by weight and is widely used in the production of iron and steel.

Other options:

FeCO₃ is siderite, a less common iron ore.
Fe₃O₄ is magnetite, another important iron ore but less abundant than hematite.
FeS₂ is pyrite, also known as “fool’s gold,” and is not a significant source of iron.

Question 7

Which one of the following metals pollutes the air of a city having large number of automobiles?

(a) Cadmium

(b) Chromium

(c) Lead

(d) Copper

Answer 7

(c) Lead

Lead was commonly used in lead-based gasoline (tetraethyl lead) as an anti-knock agent until it was phased out in most countries due to its toxic effects. Although leaded gasoline is no longer widely used, its legacy still contributes to pollution in some areas. Lead can cause serious health problems, especially affecting the nervous system.

Question 8

What is the Chemical name for baking soda?

(a) Sodium carbonate

(b) Sodium bicarbonate

(c) Sodium nitrite

(d) Sodium nitrate

Answer 8

(b) Sodium bicarbonate

Question 9

An atomic pile is used for

(a) producing X rays

(b) conducting nuclear fission

(c) conducting thermonuclear fusion

(d) accelerating atoms

Answer 9

(b) conducting nuclear fission

An atomic pile, also known as a nuclear reactor, is a device that controls nuclear fission reactions to produce energy or create radioactive isotopes.

Question 10

Which of the following gases is present under pressure in soft drinks?

(a) Oxygen

(b) Nitrogen

(c) Carbon dioxide

(d) Nitrous oxide

Answer 10

(c) Carbon dioxide

Question 11

The substance which does not expand on going from liquid state to solid state is

(a) Water

(b) Cast iron

(c) Aluminium

(d) Type metal

Answer 11

(d) Type metal

Water is unique because it expands when it freezes due to the formation of a crystalline structure that is less dense than liquid water. However, the question is about substances that do not expand upon freezing.

The correct answer is (d) Type metal. Type metal, which is an alloy of lead, antimony, and tin, actually contracts upon solidification, which is desirable in printing to ensure the proper fit of metal type in molds.

Question 12

Heart pacemakers is

(a) Uranium

(b) Deuterium

(c) Plutonium

(d) Radium

Answer 12

(a) Uranium

Question 13

The element which is commonly used in nuclear for producing electricity by nuclear fission is

(a) Radium

(b) Plutonium

(c) Uranium

(d) Deuterium

Answer 13

(c) Uranium

Question 14

Table salt gets moist during rainy season because

(a) sodium chloride is hygroscopic

(b) sodium chloride is deliquescent

(c) sodium chloride contains some quantity of sodium iodide

(d) sodium chloride contains hygroscopic impurities like magnesium chloride

Answer 14

(d) sodium chloride contains hygroscopic impurities like magnesium chloride

Question 15

Which of the following is used as a lubricant in heavy machines?

(a) Bauxite

(b) Sulphur

(c) Phosphorus

(d) Graphite

Answer 15

(d) Graphite

Graphite is an excellent lubricant, especially in high-temperature environments, because its layers can slide over each other easily, reducing friction. It is often used in heavy machinery and in situations where oil-based lubricants may not be effective

Question 16

Which of the following is used to iodine common salt?

(a) Potassium iodide

(b) Iodine

(c) Potassium iodide

(d) Sodium iodide

Answer 16

(c) Potassium iodide

Question 16

The anode in a dry cell consists of

(a) Copper

(b) Zinc

(c) Cadmium

(d) Graphite

Answer 16

(b) Zinc

In a dry cell (such as a standard alkaline battery), the zinc casing acts as the anode (negative electrode). The zinc undergoes oxidation, releasing electrons into the circuit.

Question 17

Milk is a colloidal system in which:

(a) Water is dispersed in fat

(b) Fat is dispersed in water

(c) Fat and water are dispersed in each other

(d) Fat is dissolved

Answer 17

(b) Fat is dispersed in water

Question 18

The enzyme that converts glucose to ethyl alcohol is :

(a) Invertase

(b) Maltase

(c) Zymase

(d) Diastase

Answer 18

(c) Zymase

Zymase is a complex of enzymes found in yeast that catalyzes the fermentation of glucose to produce ethanol (ethyl alcohol) and carbon dioxide.

Question 19

Silk fibre chemically is :

(a) Carbohydrate

(b) Fat

(c) Protein

(d) Cellulose

Answer 19

(c) Protein

Question 20

Who developed Hydrogen Bomb?

(a) Werner Von Braun

(b) J. Robert Oppen Heimer

(c) Edward Teller

(d) Samuel Cohen

Answer 20

(c) Edward Teller

Question 21

When there are two electrons in the same orbital they have:

(a) same spin

(b) opposite spin

(c) same or opposite spin

(d) no spin

Answer 21

(b) opposite spin

Question 22

Galvanization is the :

(a) deposition of zinc on iron

(b) deposition of tin on Iron

(c) deposition of copper on iron

(d) deposition of aluminum on iron

Answer 22

(a) deposition of zinc on iron

Question 23

Fermentation of milk to curd is due to :

(a) Mycobacterium

(b) Staphylococcus

(c) Lactobacillus

(d) Yeasts

Answer 23

(c) Lactobacillus

Question 24

By which organic compound all the oils are known ?

(a) Carbohydrate

(b) Protein

(c) Hydrocarbon

(d) Ester

Answer 24

(c) Hydrocarbon

Question 25

How many are there protons in the nucleus of carbon?

(a) 6

(b) 12

(c) 18

(d) Zero

Answer 25

(a) 6

Question 26

Who developed atom bomb ?

(a) Warner Wan Brown

(b) J. Robert Open heimer

(c) Edward Taylor

(d) Samuel Koehen

Answer 26

(b) J. Robert Open heimer

Question 27

The major harmful gas emitted by automobile vehicle which causes air pollution is

(a) Carbon Monoxide

(b) Methane

(c) Carbon dioxide

(d) Ozone gas

Answer 27

(c) Carbon dioxide

Question 28

The acid used in lead storage cells is

(a) phosphoric acid

(b) hydrochloric acid

(c) nitric acid

(d) sulphuric acid

Answer 28

(d) sulphuric acid

Question 29

Milk tastes sour when kept in the open for sometime due to the formation of

(a) lactic acid

(b) citric acid

(c) acetic acid

(d) carbonic acid

Answer 29

(a) lactic acid

Question 30

What is the most commonly used Substance in fluorescent tubes?

(a) Sodium oxide and argon

(b) Sodium vapour and neon

(c) Mercury vapour and argon

(d) Mercury oxide and neon

Answer 30

(c) Mercury vapour and argon

Question 31

What is “milk of magnesia” chemically?

(a) Magnesium carbonate

(b) Sodium bicarbonate

(c) Calcium hydroxide

(d) Magnesium hydroxide

Answer 31

(d) Magnesium hydroxide

Question 32

Bronze is an alloy of

(a) Copper and Zinc

(b) Tin and Zinc

(c) Copper and Tin

(d) Iron and Zinc.

Answer 32

(c) Copper and Tin

Question 33

The natural source of hydrocarbon is

(a) Crude oil

(b) Biomass

(c) Coal

(d) Carbohydrates

Answer 33

(a) Crude oil

Question 34

Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)?

(a) Methane

(b) Ethane

(c) Propane

(d) Butane

Answer 34

(d) Butane

LPG typically consists of a mixture of these two hydrocarbons. In residential and commercial uses, butane and propane are preferred due to their ability to remain in liquid form under moderate pressure or at low temperatures, making them convenient for storage and transportation.

So, the correct answer is (d) Butane and (c) Propane (both are correct, but if you have to choose one, butane is often more emphasized).

Question 35

Which one of the following metals is used to galvanize iron?

(a) Copper

(b) Lead

(c) Zinc

(d) Mercury

Answer 35

(c) Zinc

Question 36

Which of the following is not a precious semiprecious stone?

(a) Sapphire

(b) Ruby

(c) Pearl

(d) Emerald

Answer 36

(c) Pearl

Question 37

Which among the following metals provides atmospheric oxide?

(a) Sodium

(b) Silver

(c) Aluminium

(d) Calcium

Answer 37

(c) Aluminium

Aluminium reacts with oxygen in the air to form a thin, protective layer of aluminium oxide (Al₂O₃) on its surface. This oxide layer prevents further oxidation and corrosion of the underlying metal, which is why aluminium is highly resistant to rust and corrosion.

Question 38

Humburger effect is otherwise known as

(a) Sodium pump

(b) Anaerobic metabolism

(c) Chloride shift

(d) Respiratory product

Answer 38

(c) Chloride shift

The chloride shift refers to the process in which chloride ions (Cl⁻) move into red blood cells in exchange for bicarbonate ions (HCO₃⁻) moving out. This occurs during the transport of carbon dioxide (CO₂) from tissues to the lungs and helps maintain the electrochemical balance in the blood.

Question 39

Which among the following elements is found in maximum percentage in the human body?

(a) Carbon

(b) Hydrogen

(c) Nitrogen

(d) Oxygen

Answer 39

(d) Oxygen

Oxygen: ~65%
Carbon: ~18%
Hydrogen: ~10%
Nitrogen: ~3%
Calcium: ~1.5%
Phosphorus: ~1%
Potassium: ~0.2%
Sulfur: ~0.2%
Sodium: ~0.1%
Chlorine: ~0.1%
Magnesium: ~0.05%

Question 40

Which among the following stage is suitable indicator when solution of sodium carbonate is mixed with sulphuric acid ?

(a) Methylene blue

(b) Methyl red

(c) Phenolphthalein

(d) Methyl orange

Answer 40

(d) Methyl orange

Question 41

Which among the following is pure matter?

(a) Carbon dioxide

(b) Brass

(c) Air

(d) Iron

Answer 41

(d) Iron

Question 42

Which among the following coal contains 90 percent of carbon?

(a) Anthracite

(b) Bitumen

(c) Lignite

(d) Peat

Answer 42

(a) Anthracite

Question 43

Bauxite is an alloy of which of the following metals?

(a) Aluminium

(b) Silver

(c) Tin

(d) Iron

Answer 43

(a) Aluminium

Question 44

Nucleus of an atom consists of

(a) Proton

(b) Neutron

(c) Proton and Neutron

(d) Electron Proton and Neutron

Answer 44

(c) Proton and Neutron

Question 45

Milk of Magnesia is a suspension of :

(a) magnesium sulphate

(b) magnesium carbonate

(c) magnesium hydroxide

(d) magnesium chloride

Answer 45

(c) magnesium hydroxide

Question 46

Quartz is made of

(a) Calcium Sulphate

(b) Calcium Silicate

(c) Sodium Sulphate

(d) Sodium Silicate

Answer 46

(d) Sodium Silicate

Question 47

Which of the following is ozone depleting pesticide?

(a) D.D.T.

(b) Benzene

(c) Methyl bromide

(d) Ethylene ozonide

Answer 47

(c) Methyl bromide

Methyl bromide is a pesticide and fumigant that has been found to contribute to the depletion of the ozone layer.

D.D.T. (Dichlorodiphenyltrichloroethane) is a pesticide but is not primarily known for depleting the ozone layer; it is more associated with environmental and health concerns.

Benzene is a chemical solvent and is not associated with ozone depletion.

Ethylene ozonide is not a commonly known or used substance, and it is not typically associated with ozone depletion.

Question 48

Galvanized iron is made by coating iron with

(a) Zinc

(b) Nickel

(c) Chromium

(d) Sulphur

Answer 48

(a) Zinc

Question 49

Which is abundant in Gobar gas?

(a) Carbon dioxide

(b) Methane

(c) Oxygen

(d) Hydrogen

Answer 49

(b) Methane

Biogas is primarily composed of methane (CH₄) and carbon dioxide (CO₂), with smaller amounts of other gases such as hydrogen sulfide (H₂S). Methane is the main component and is responsible for the gas’s flammable properties and its use as a fuel.