Class 7th Chemistry
Sample Paper 2
Time: 2 Hrs Total Marks: 75
Choose the correct answer out of the four available choices given under each question.
Petroleum is refined using
The symbol of mercury is
The molecular formula of hydrogen is
The process by which oxidation of food in our body take place is
are used for dyeing and coloring clothes.
(a) Animal extracts
(b) Plant extracts
(c) Fossil fuels
An evaporating dish is made of
Bronze is an alloy of
(a) Copper and tin
(b) Copper and silver
(c) Copper and nickel
(d) Copper and aluminum
Which of the following is volatile in nature?
(a) Common salt
Burning of fuels releases in the atmosphere.
(a) Carbon dioxide and water vapour
(b) Oxygen and water vapour
(c) Sulphur dioxide and water vapour
(d) Carbon monoxide and water vapour
Balancing chemical equation is based on
(a) Law of conservation of mass
(b) Mass of reactant and product
(c) Symbols and formulae
(d) None of the above
is hydrated calcium sulphate.
Which of the following involves a change from the solid state directly to the gaseous state?
A fuel when used releases least amount of pollutants in the air.
(a) Sulphur dioxide
Which of the following is used in advertising signboards?
Give a scientific word for the following:
An alloy of copper, tin, and zinc.
A substance made by fusing sand, soda, and gravel.
A substance used to speed up or slow down the chemical reactions without taking part in
Molecules of an element containing three atoms of the same type.
A gas liberated when dilute acids react with metals.
Fill in the blanks and rewrite the sentences:
______is used in observation balloons.
______is used to prepare solutions for medicinal purposes, laboratories, and car
Plaster of Paris is______
Latin name for copper is______
Oxygen occupies about______ of air by volume.
Match the item in Column A with the appropriate item in Column B.
Give uses of following inert gases
Xenon and Kryptons
Classify the following elements as metals, non-metals and metalloids
Define the following:
Rusting of iron
Give the chemical formulae for the following:
State five characteristics of chemical reactions
State whether True or False
No new substance is formed during chemical change.
Sulphuric acid is a weak acid.
Black residue is formed when sugar is heated.
A conical flask is used for storing and mixing liquids
Milk is a mixture.
Match the apparatus with its correct use.
Distinguish between physical and chemical changes.
Distinguish between metal and non-metal
Distinguish between pure substance and mixture.