Font size
Worksheetsscience
Total questions: 34
Worksheet time: 20mins
The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
Copper granules
Magnesium ribbon
Sodium pellets
Aluminium dust
What is the another name of quick lime?
Calcium hydroxide
Calcium oxide
Carbon dioxide
Sodium oxide
What happens when carbon dioxide is passed in lime water?
Lime water turns milky because of formation of calcium carbonate
Lime water turns milky because of formation of water
Lime water turns red because of formation permanganate
Lime water turns red because of formation of copper sulphate
How rancidity can be prevented?
By adding antioxidants in food
By adding more oxygen to food
By keeping food items in open
All of the above
Which of the following termed as reducing agent?
Which gives oxygen
Which removes oxygen
Which removes hydrogen
All of the above
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below
Assertion (A) : White silver chloride turns grey in sunlight.
Reason (R) : Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below
Assertion (A) : Brown fumes are produced when lead nitrate is heated.
Reason (R) : Nitrogen dioxide gas is produced as a by product due to the decomposition of lead nitrate.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below
Assertion (A) : Calcium carbonate when heated gives calcium oxide and water.
Reason (R) : On heating calcium carbonate, decomposition reaction takes place.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below
Assertion (A) : When HCl is added to zinc granules, a chemical reaction occurs.
Reason (R) : Evolution of a gas and change in colour indicate that the chemical reaction is taking place.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below
Assertion (A) : Decomposition of vegetable matter into compost is an example of exothermic reactions.
Reason (R) : Exothermic reaction are those reactions in which heat is evolved.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
What happens when copper rod is dipped in iron
sulphate solution?
Copper displaces iron
Blue colour of copper sulphate solution is obtained
No reaction takes place
Reaction is exothermic
When hydrogen sulphide gas is passed through a blue
solution of copper sulphate, a black precipitate of
copper sulphide is obtained and the sulphuric acid so
formed remains in the solution. The reaction is an
example of-
a combination reaction
a displacement reaction
a decomposition reaction
a double displacement reaction
A substance which oxidises itself and reduces other is
known as -
oxidising agent
reducing agent
both of these
none of these
Precipitation reactions produce insoluble ………….
(a)
…………. is the process in which metals are eaten up gradually by the action of air, moisture or a chemical on their surface
(a)
Which of the following is an endothermic process?
Dilution of sulphuric acid
Sublimation of dry ice
Condensation of water vapours
Respiration in human beings
Which of the following gases is used in the storage of fat and oil containing foods for a long time?
Carbondioxide gas
Nitrogen gas
Oxygen gas
Neon gas
It is necessary to balance a chemical equation in order to satisfy the law of
Conservation of motion
Conservation of momentum
Conservation of energy
Conservation of mass
Respiration is an ………….. reaction.
(a)
Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the type of the reaction involved?
(a)
Which option denotes a double displacement reaction?
A + B + C
A + B → C
AC + BD → AD + BC
AC + B → AB + C
Which of the following are exothermic processes?
sublimation of camphor (crystals)
Evaporation of water
Reaction of water with quick lime
Dilution of an acid
Heating of ferrous sulphate gives which of the following product?
Ferric oxide
Sulphur dioxide
Sulphur trioxide
All the above
Which of the following product is formed when calcium oxide reacts with water?
Slaked lime
Carbon dioxide
Calcium oxide
Oxygen gas
Rusting of an iron is an example of :
Reduction
Ionization
Oxidation
Dissociation
Black and white photography uses
Decomposition of silver chloride
Decomposition of silver bromide
Both
None of these
White silver chloride in sunlight turns to :
Grey
Yellow
Remain white
Red
7.The equation
Cu + xHNO3 -> Cu(NO3)2 + yNO2 + 2H2O
The values of x and y are
3 and 5
8 and 6
4 and 2
7 and 1
3.What happens when copper rod is dipped in iron sulphate solution :-
Copper displaces iron
Blue color of copper sulphate solution is obtained
No reaction takes place
Reaction is exothermic
The chemical formula of lead sulphate is :
Pb2SO4
Pb(SO4)2
PbSO4
Pb2(SO4)3
Which of the following gases can be used for storage of fresh sampel of an oil for a long time?
Carbon dioxide or oxygen
Nitrogen or helium
Helium or oxygen
Nitrogen or oxygen
In which of the following process a chemical reaction has taken place?
Ice melts into water
A wet shirt got dried in sunlight
A brown layer is formed over iron rod kept in air
sugar getting dissolved in water
Magnesium ribbon is rubbed before burning because it has a coating of
basic magnesium carbonate
basic magnesium oxide
basic magnesium sulphide
basic magnesium chloride
Chemical formula of quick lime is :
CaO
Ca(OH)2
CaCO3
CO2
