General Science Set-2: Chemistry
General Science Set-2: Chemistry
Question 1
Which of the following is a chemical change?
(1) Melting of ice
(2) Dissolving sugar in water
(3) Rusting of iron
(4) Cutting of paper
Show Answer
Answer: (3)
Solution: Rusting of iron involves the formation of new substances (iron oxide), which is a chemical change.
Question 2
The process of converting solid to gas directly is called:
(1) Sublimation
(2) Evaporation
(3) Condensation
(4) Freezing
Show Answer
Answer: (1)
Solution: Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
Question 3
Which of the following is a mixture?
(1) Water
(2) Salt
(3) Air
(4) Oxygen
Show Answer
Answer: (3)
Solution: Air is a mixture of gases like nitrogen, oxygen, carbon dioxide, etc.
Question 4
Which of the following is an example of a physical change?
(1) Burning of wood
(2) Rusting of iron
(3) Melting of ice
(4) Digestion of food
Show Answer
Answer: (3)
Solution: Melting of ice is a physical change as it only changes the state of matter without forming new substances.
Question 5
The chemical formula for table salt is:
(1) $ \text{NaCl} $
(2) $ \text{HCl} $
(3) $ \text{CO}_2 $
(4) $ \text{O}_2 $
Show Answer
Answer: (1)
Solution: Table salt is composed of sodium and chlorine, represented by the formula $ \text{NaCl} $.
Question 6
Which of the following is a noble gas?
(1) Oxygen
(2) Nitrogen
(3) Helium
(4) Carbon
Show Answer
Answer: (3)
Solution: Helium is a noble gas and is found in Group 18 of the periodic table.
Question 7
The process of separating components of a mixture based on their different boiling points is called:
(1) Filtration
(2) Distillation
(3) Evaporation
(4) Crystallization
Show Answer
Answer: (2)
Solution: Distillation is used to separate liquids based on their different boiling points.
Question 8
Which of the following is an element?
(1) Water
(2) Air
(3) Oxygen
(4) Sugar
Show Answer
Answer: (3)
Solution: Oxygen is an element, while water, air, and sugar are compounds or mixtures.
Question 9
The gas responsible for the formation of acid rain is:
(1) $ \text{CO}_2 $
(2) $ \text{SO}_2 $
(3) $ \text{N}_2 $
(4) $ \text{O}_2 $
Show Answer
Answer: (2)
Solution: Sulfur dioxide ($ \text{SO}_2 $) reacts with water to form sulfuric acid, leading to acid rain.
Question 10
Which of the following is a non-metal?
(1) Iron
(2) Sodium
(3) Carbon
(4) Calcium
Show Answer
Answer: (3)
Solution: Carbon is a non-metal, while iron, sodium, and calcium are metals.
Question 11
The chemical symbol for silver is:
(1) $ \text{Ag} $
(2) $ \text{Al} $
(3) $ \text{Sn} $
(4) $ \text{Fe} $
Show Answer
Answer: (1)
Solution: Silver is represented by the symbol $ \text{Ag} $ in the periodic table.
Question 12
Which of the following is a physical property of a substance?
(1) Flammability
(2) Reactivity
(3) Density
(4) Combustibility
Show Answer
Answer: (3)
Solution: Density is a physical property, while flammability, reactivity, and combustibility are chemical properties.
Question 13
Which of the following is a covalent compound?
(1) $ \text{NaCl} $
(2) $ \text{MgO} $
(3) $ \text{H}_2\text{O} $
(4) $ \text{KCl} $
Show Answer
Answer: (3)
Solution: Water ($ \text{H}_2\text{O} $) is a covalent compound, while the others are ionic.
Question 14
The process of separating a solid from a liquid by heating is called:
(1) Filtration
(2) Distillation
(3) Evaporation
(4) Sedimentation
Show Answer
Answer: (3)
Solution: Evaporation is the process of heating a liquid to separate a solid from it.
Question 15
Which of the following is a mixture of two or more substances?
(1) Water
(2) Air
(3) Oxygen
(4) Sodium chloride
Show Answer
Answer: (2)
Solution: Air is a mixture of gases like nitrogen, oxygen, and carbon dioxide.
Question 16
The gas that supports combustion is:
(1) $ \text{N}_2 $
(2) $ \text{O}_2 $
(3) $ \text{CO}_2 $
(4) $ \text{H}_2 $
Show Answer
Answer: (2)
Solution: Oxygen ($ \text{O}_2 $) is the gas that supports combustion.
Question 17
The process of separating components based on their particle size is called:
(1) Filtration
(2) Distillation
(3) Evaporation
(4) Crystallization
Show Answer
Answer: (1)
Solution: Filtration is used to separate solids from liquids based on particle size.
Question 18
Which of the following is a metalloid?
(1) Silicon
(2) Sodium
(3) Carbon
(4) Oxygen
Show Answer
Answer: (1)
Solution: Silicon is a metalloid, while sodium is a metal, and carbon and oxygen are non-metals.
Question 19
The chemical formula for carbon dioxide is:
(1) $ \text{CO} $
(2) $ \text{CO}_2 $
(3) $ \text{C}_2\text{O} $
(4) $ \text{C}_3\text{O}_2 $
Show Answer
Answer: (2)
Solution: Carbon dioxide is represented by the formula $ \text{CO}_2 $.
Question 20
Which of the following is a chemical property of a substance?
(1) Color
(2) Density
(3) Flammability
(4) Melting point
Show Answer
Answer: (3)
Solution: Flammability is a chemical property, while color, density, and melting point are physical properties.
Question 21
The gas that is used in the production of artificial rain is:
(1) $ \text{CO}_2 $
(2) $ \text{SO}_2 $
(3) $ \text{N}_2 $
(4) $ \text{O}_3 $
Show Answer
Answer: (1)
Solution: Carbon dioxide ($ \text{CO}_2 $) is used in cloud seeding for artificial rain.
Question 22
Which of the following is a compound?
(1) Air
(2) Water
(3) Sand
(4) Sugar
Show Answer
Answer: (2)
Solution: Water is a compound, while air, sand, and sugar are mixtures or other compounds.
Question 23
The process of dissolving a solid in a liquid is called:
(1) Melting
(2) Dissolution
(3) Sublimation
(4) Evaporation
Show Answer
Answer: (2)
Solution: Dissolution is the process where a solid dissolves in a liquid.
Question 24
Which of the following is a physical change?
(1) Burning of wood
(2) Rusting of iron
(3) Melting of ice
(4) Digestion of food
Show Answer
Answer: (3)
Solution: Melting of ice is a physical change as it only changes the state of matter without forming new substances.
Question 25
The gas that is used in the preparation of artificial fire is:
(1) $ \text{CO}_2 $
(2) $ \text{O}_2 $
(3) $ \text{N}_2 $
(4) $ \text{H}_2 $
BETA
