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Q. No.
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Question
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Marks
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Ques 1.
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Choose the correct answer out of the four available choices given under each question.
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15
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1.
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Petroleum is refined using
(a) Filtration
(b) Sedimentation
(c) Distillation
(d) Evaporation
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2.
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The symbol of mercury is
(a) $mathrm{Me}$
(b) $mathrm{Hg}$
(c) $mathrm{Mg}$
(d) $mathrm{He}$
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3.
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The molecular formula of hydrogen is
(a) $mathrm{H}_{1}$
(b) $mathrm{H}_{2}$
(c) $mathrm{H}_{3}$
(d) $mathrm{H}_{4}$
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4.
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The process by which oxidation of food in our body take place is
(a) Photosynthesis
(b) Respiration
(c) Decomposition
(d) Combustion
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5.
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are used for dyeing and coloring clothes.
(a) Animal extracts
(b) Plant extracts
(c) Fossil fuels
(d) Salts
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6.
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An evaporating dish is made of
(a) Porcelain
(b) Steel
(c) Aluminum
(d) Wood
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7.
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Bronze is an alloy of
(a) Copper and tin
(b) Copper and silver
(c) Copper and nickel
(d) Copper and aluminum
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8.
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Which of the following is volatile in nature?
(a) Common salt
(b) Petrol
(c) Water
(d) Milk
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9.
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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
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10.
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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
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11.
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Nuts contain
(a) Carbohydrates
(b) Proteins
(c) Fats
(d) Methane
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12.
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is hydrated calcium sulphate.
(a) Marble
(b) Talc
(c) Gypsum
(d) Coal
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13.
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Which of the following involves a change from the solid state directly to the gaseous state?
(a) Evaporation
(b) Sublimation
(c) Condensation
(d) Solidification
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14.
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A fuel when used releases least amount of pollutants in the air.
(a) Sulphur dioxide
(b) Chlorofluorocarbon
(c) Smoke
(d) CNG
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15.
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Which of the following is used in advertising signboards?
(a) Argon
(b) Krypton
(c) Xenon
(d) Helium
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Ques 2.
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A.
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Give a scientific word for the following:
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5
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1.
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An alloy of copper, tin, and zinc.
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2.
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A substance made by fusing sand, soda, and gravel.
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3.
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A substance used to speed up or slow down the chemical reactions without taking part in
the reaction.
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4.
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Molecules of an element containing three atoms of the same type.
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5.
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A gas liberated when dilute acids react with metals.
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B.
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Fill in the blanks and rewrite the sentences:
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5
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1.
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______is used in observation balloons.
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2.
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______is used to prepare solutions for medicinal purposes, laboratories, and car
batteries.
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3.
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Plaster of Paris is______
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4.
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Latin name for copper is______
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5.
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Oxygen occupies about______ of air by volume.
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Ques 3.
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A.
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Match the item in Column A with the appropriate item in Column B.
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Column A
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Column B
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Global warming
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Hydrated ferric oxide
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Acid rain
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Manganese oxide
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Rust
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Carbon dioxide
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Catalyst
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Ozone
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Photosynthesis
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Nitrogen dioxide
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5
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B.
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Give uses of following inert gases
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5
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1.
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Neon
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2.
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Radon
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3.
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Xenon and Kryptons
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4.
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Helium
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5.
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Argon
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Ques 4.
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5
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A.
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Classify the following elements as metals, non-metals and metalloids
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Silicon
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Sulphur
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Platinum
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Hydrogen
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Copper
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B.
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Define the following:
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5
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1.
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Nitrogen fixation
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2.
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Atomicity
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3.
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Polyatomic molecules
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4.
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Homogeneous mixtures
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5.
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Rusting of iron
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Ques 5.
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A.
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Give the chemical formulae for the following:
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5
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1.
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Sulphuric acid
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2.
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Aluminium sulphate
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3.
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Magnesium oxide
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4.
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Hydrochloric acid
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5.
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Potassium hydroxide
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B.
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State five characteristics of chemical reactions
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5
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Ques 6.
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A.
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State whether True or False
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5
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1.
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No new substance is formed during chemical change.
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2.
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Sulphuric acid is a weak acid.
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3.
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Black residue is formed when sugar is heated.
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4.
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A conical flask is used for storing and mixing liquids
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5.
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Milk is a mixture.
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B.
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Match the apparatus with its correct use.
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Bunsen burner
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Mixing and storing gases
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Thistle funnel
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Heating purposes
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Wire gauze
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Measuring liquids
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Measuring cylinder
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Transferring liquids
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Conical flask
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Preventing cracking of a glass apparatus during heating
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5
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Ques 7.
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A.
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1.
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Distinguish between physical and chemical changes.
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3
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2.
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Distinguish between metal and non-metal
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4
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B.
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Distinguish between pure substance and mixture.
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3
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