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Free cbse mcq Practice Papers for Class 10 Students
To balance the following chemical equation, the values of x and y should respectively be:
2NaOH + xAl₂O₃ → yNaAlO₂ + H₂O
a) 1, 4
b) 1, 2
c) 2, 4
d) 2, 3
Option b – 1, 2
When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out. The chemical equation for the reaction involved is:
a) KI + PbNO₃ → PbI + KNO₃
b) 2KI + Pb(NO₃)₂ → PbI₂ + 2KNO₃
c) KI + Pb(NO₃)₂ → PbI + KNO₃
d) KI + PbNO₃ → PbI₂ + KNO₃
Option b – 2KI + Pb(NO₃)₂ → PbI₂ + 2KNO₃
A metal ribbon ‘X’ burns in oxygen with a dazzling white flame forming a white ash ‘Y’. The correct description of X, Y, and the type of reaction is:
a) X = Ca; Y = CaO; Type of reaction = Decomposition
b) X = Mg; Y = MgO; Type of reaction = Combination
c) X = Al; Y = Al₂O₃; Type of reaction = Thermal decomposition
d) X = Zn; Y = ZnO; Type of reaction = Endothermic
Option b – X = Mg; Y = MgO; Type of reaction = Combination
Consider the following chemical equations I and II:
I. Mg + 2HCl → MgCl₂ + H₂
II. NaOH + HCl → NaCl + H₂O
a) ‘I’ is a displacement reaction and ‘II’ is a decomposition reaction.
b) ‘I’ is a displacement reaction and ‘II’ is a double-displacement reaction.
c) Both ‘I’ and ‘II’ are displacement reactions.
d) Both ‘I’ and ‘II’ are double-displacement reactions.
Option b – ‘I’ is a displacement reaction and ‘II’ is a double-displacement reaction
What type of chemical reaction takes place when Electricity is passed through water?
(a) Displacement
(b) Combination
(c) Decomposition
(d) Double displacement
Option c – Decomposition
Select the oxidising agent for the following reaction:
H₂S + I₂ → 2HI + S
(a) I₂
(b) H₂S
(c) HI
(d) S
Option a – I₂
A substance added to Food containing fats and oils is called:
(a) Oxidant
(b) Rancid
(c) Coolant
(d) Antioxidant
Option d – Antioxidant
The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:
(a) Antioxidation
(b) Reduction
(c) Rancidity
(d) Corrosion
Option c – Rancidity
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the process is:
(a) 1 : 1
(b) 2 : 1
(c) 4 : 1
(d) 1 : 2
Option b – 2 : 1
When SO₂ gas is passed through a saturated solution of H₂S, which reaction occurs?
(a) SO₂ + 2H₂S → 2H₂O + 3S
(b) SO₂ + 2H₂S → H₂O + 3S
(c) SO₂ + H₂S → H₂O + S
(d) SO₂ + H₂O → SO₃ + H₂
Option a – SO₂ + 2H₂S → 2H₂O + 3S
Name the products formed when iron filings are heated with dilute hydrochloric Acid:
(a) Fe (III) chloride and water
(b) Fe (II) chloride and water
(c) Fe (II) chloride and hydrogen gas
(d) Fe (III) chloride and hydrogen gas
Option c – Fe (II) chloride and hydrogen gas
The reaction Pb + CuCl₂ → PbCl₂ + Cu is an example of:
(a) Combination
(b) Double displacement
(c) Decomposition
(d) Displacement
Option d – Displacement
Which of the following gases can be used for storing fresh samples of oil for a long time?
(a) Carbon dioxide or Oxygen
(b) Nitrogen or Oxygen
(c) Carbon dioxide or Helium
(d) Helium or Nitrogen
Option d – Helium or Nitrogen
A dilute ferrous sulphate solution was added to acidified permanganate solution. The Light purple colour of the solution fades and disappears. Which explains the observation?
(a) KMnO₄ is an oxidising agent; it oxidises FeSO₄.
(b) FeSO₄ acts as an oxidising agent and oxidises KMnO₄.
(c) The colour disappears due to dilution; no reaction occurs.
(d) KMnO₄ is unstable and decomposes in the presence of FeSO₄.
Option a – KMnO₄ is an oxidising agent; it oxidises FeSO₄
In which chemical equation do the abbreviations correctly represent the states of the reactants and products?
(a) 2H₂ (l) + O₂ (l) → 2H₂O (g)
(b) 2H₂ (g) + O₂ (l) → 2H₂O (l)
(c) 2H₂ (g) + O₂ (g) → 2H₂O (l)
(d) 2H₂ (g) + O₂ (g) → 2H₂O (g)
Option c – 2H₂ (g) + O₂ (g) → 2H₂O (l)
When green-coloured ferrous sulphate crystals are heated, their colour changes because:
(a) It decomposes to ferric oxide.
(b) It loses water of crystallisation.
(c) It forms SO₂.
(d) It forms SO₃.
Option b – It loses water of crystallisation
A substance ‘X’ is used in whitewashing and is obtained by heating limestone in the absence of air. Identify ‘X’:
(a) CaOCl₂
(b) Ca(OH)₂
(c) CaO
(d) CaCO₃
Option c – CaO
When Ag is exposed to air, it gets a black coating of:
(a) AgNO₃
(b) Ag₂S
(c) Ag₂O
(d) Ag₂CO₃
Option b – Ag₂S
Which of the following is an endothermic process?
(a) Dilution of sulphuric Acid
(b) Sublimation of dry ice
(c) Condensation of water vapours
(d) Respiration in human beings
Option b – Sublimation of dry ice
In a double displacement reaction between aqueous potassium iodide and lead nitrate, a yellow precipitate of lead iodide forms. If lead nitrate is unavailable, what can be used instead?
(a) Lead sulphate (insoluble)
(b) Lead acetate
(c) Ammonium nitrate
(d) Potassium sulphate
Option b – Lead acetate
Oxidation is a process which involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of oxygen
(d) removal of carbon
Option a – addition of oxygen
The process of reduction involves
(a) addition of oxygen
(b) addition of hydrogen
(c) removal of carbon
(d) removal of hydrogen
Option b – addition of hydrogen
Three beakers labelled as A, B, and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO₄, and NaCl were added to the beakers A, B, and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C, exothermic process has occurred.
(iv) In beaker C, endothermic process has occurred.
(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (iv), (ii), and (iii)
Option c – (i) and (iv)
Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1 : 2
(b) 1 : 1
(c) 2 : 1
(d) 1 : 8
Option c – 2 : 1
Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to
(i) the formation of silver by decomposition of silver chloride
(ii) sublimation of silver chloride
(iii) decomposition of chlorine gas from silver chloride
(iv) oxidation of silver chloride
(a) (i) only
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iv) only
Option a – (i) only
MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂. Identify the substance oxidized in the above equation.
(a) MnCl₂
(b) HCl
(c) H₂O
(d) MnO₂
Option b – HCl
Calcium oxide reacts vigorously with water to produce slaked lime.
CaO (s) + H₂O (l) → Ca(OH)₂ (aq)
This reaction can be classified as:
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Oxidation reaction
Which of the following is a correct option?
(a) (A) and (C)
(b) (C) and (D)
(c) (A), (C), and (D)
(d) (A) and (B)
Option d – (A) and (B)
Which of the following is a displacement reaction?
(a) MgCO₃ → MgO + CO₂
(b) 2Na + 2H₂O → 2NaOH + H₂
(c) 2H₂ + O₂ → 2H₂O
(d) 2Pb(NO₃)₂ → Heat → 2PbO + 4NO₂ + O₂
Option b – 2Na + 2H₂O → 2NaOH + H₂
Magnesium ribbon is rubbed before burning because it has a coating of
(a) basic magnesium carbonate
(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride
Option b – basic magnesium oxide
Which of the following statements about the given reaction are correct?
3Fe (s) + 4H₂O (g) → Fe₃O₄ (s) + 4H₂ (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(a) (i), (ii), and (iii)
(b) (iii) and (iv)
(c) (i), (ii), and (iv)
(d) (ii) and (iv)
Option c – (i), (ii), and (iv)
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an Acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Option a – (i) and (ii)
The name of the Salt used to remove permanent hardness of water is:
(a) Sodium hydrogen carbonate (NaHCO₃)
(b) Sodium chloride (NaCl)
(c) Sodium carbonate decahydrate (Na₂CO₃·10H₂O)
(d) Calcium sulphate hemihydrate (CaSO₄·1/2 H₂O)
Option c – Sodium carbonate decahydrate (Na₂CO₃·10H₂O)
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric Acid
Option d – Hydrochloric Acid
When copper oxide and dilute hydrochloric Acid react, the color changes to:
(a) White
(b) Bluish-green
(c) Blue-black
(d) Black
Option b – Bluish-green
Sodium hydroxide is used:
(a) As an antacid
(b) In the manufacture of soap
(c) As a cleansing agent
(d) In alkaline batteries
Option b – In the manufacture of soap
Sodium hydroxide turns phenolphthalein solution:
(a) Pink
(b) Yellow
(c) Colourless
(d) Orange
Option a – Pink
Chemical formula of washing soda is:
(a) Na₂CO₃·7H₂O
(b) Na₂CO₃·5H₂O
(c) Na₂CO₃·2H₂O
(d) Na₂CO₃·10H₂O
Option d – Na₂CO₃·10H₂O
An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous solution ‘B’ to ‘A’, the pink color disappears. The following statement is true for solution ‘A’ and ‘B’:
(a) A is strongly basic and B is a weak Base.
(b) A is strongly acidic and B is a weak Acid.
(c) A has pH greater than 7 and B has pH less than 7.
(d) A has pH less than 7 and B has pH greater than 7.
Option c – A has pH greater than 7 and B has pH less than 7
When sodium bicarbonate reacts with dilute hydrochloric Acid, the gas evolved is:
(a) Hydrogen; it gives a pop sound with a burning matchstick.
(b) Hydrogen; it turns lime water milky.
(c) Carbon dioxide; it turns lime water milky.
(d) Carbon dioxide; it blows off a burning matchstick with a pop sound.
Option c – Carbon dioxide; it turns lime water milky
Acid present in tomato is:
(a) Methanoic Acid
(b) Acetic acid
(c) Lactic acid
(d) Oxalic acid
Option d – Oxalic acid
Sodium hydroxide is termed an alkali, while Ferric hydroxide is not because:
(a) Sodium hydroxide is a strong Base, while Ferric hydroxide is a weak Base.
(b) Sodium hydroxide is a Base that is soluble in water, while Ferric hydroxide is also a Base but it is not soluble in water.
(c) Sodium hydroxide is a strong Base while Ferric hydroxide is a strong acid.
(d) Sodium hydroxide and Ferric hydroxide are both strong Bases, but the solubility of Sodium hydroxide in water is comparatively higher than that of Ferric hydroxide.
Option b – Sodium hydroxide is a Base that is soluble in water, while Ferric hydroxide is also a Base but it is not soluble in water
Lime water reacts with chlorine to give:
(a) Bleaching powder
(b) Baking powder
(c) Baking soda
(d) Washing soda
Option a – Bleaching powder
Nettle sting is a natural source of which acid?
(a) Methanoic acid
(b) Lactic acid
(c) Citric acid
(d) Tartaric acid
Option a – Methanoic acid
Tooth enamel is made up of:
(a) Calcium phosphate
(b) Calcium carbonate
(c) Calcium oxide
(d) Potassium
Option a – Calcium phosphate
What is the pH range of our body?
(a) 7.0-7.8
(b) 7.2-8.0
(c) 7.0-8.4
(d) 7.2-8.4
Option a – 7.0-7.8
Rain is called acid rain when its pH falls below:
(a) 7
(b) 6
(c) 5.6
(d) Above 7
Option c – 5.6
Sodium hydroxide is a:
(a) Weak Base
(b) Weak acid
(c) Strong Base
(d) Strong acid
Option c – Strong base
In terms of acidic strength, which one of the following is in the correct increasing order?
(a) Water < Acetic acid < Hydrochloric acid
(b) Water < Hydrochloric acid < Acetic acid
(c) Acetic acid < Water < Hydrochloric acid
(d) Hydrochloric acid < Water < Acetic acid
Option a – Water < Acetic acid < Hydrochloric acid
What is formed when zinc reacts with sodium hydroxide?
(a) Zinc hydroxide and sodium
(b) Sodium zincate and hydrogen gas
(c) Sodium zinc-oxide and hydrogen gas
(d) Sodium zincate and water
Option b – Sodium zincate and hydrogen gas
Tomato is a natural source of which acid?
(a) Acetic acid
(b) Citric acid
(c) Tartaric acid
(d) Oxalic acid
Option d – Oxalic acid
Brine is an:
(a) Aqueous solution of sodium hydroxide
(b) Aqueous solution of sodium carbonate
(c) Aqueous solution of sodium chloride
(d) Aqueous solution of sodium bicarbonate
Option c – Aqueous solution of sodium chloride
Na₂CO₃·10H₂O is:
(a) Washing soda
(b) Baking soda
(c) Bleaching powder
(d) Tartaric acid
Option a – Washing soda
At what temperature is gypsum heated to form Plaster of Paris?
(a) 373°C
(b) 100°C
(c) 110°C
(d) 120°C
Option b – 100°C
How many water molecules does hydrated calcium sulphate contain?
(a) 5
(b) 10
(c) 7
(d) 2
Option d – 2
Sodium carbonate is a basic Salt because it is a Salt of a:
(a) Strong acid and strong base
(b) Weak acid and weak base
(c) Strong acid and weak base
(d) Weak acid and strong base
Option d – Weak acid and strong base
Alkalis are:
(a) Acids, which are soluble in water
(b) Acids, which are insoluble in water
(c) Bases, which are insoluble in water
(d) Bases, which are soluble in water
Option d – Bases, which are soluble in water
Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
Choose the options given below:
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Option d – (ii) and (iv)
Baking soda is a mixture of:
(a) Sodium carbonate and acetic acid
(b) Sodium carbonate and tartaric acid
(c) Sodium hydrogen carbonate and tartaric acid
(d) Sodium hydrogen carbonate and acetic acid
Option c – Sodium hydrogen carbonate and tartaric acid
When a small amount of acid is added to water, the phenomena which occur are:
(A) Dilution
(B) Neutralisation
(C) Formation of H₃O⁺ ions
(D) Salt formation
The correct statements are:
(a) (A) and (C)
(b) (B) and (D)
(c) (A) and (B)
(d) (C) and (D)
Option a – (A) and (C)
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) Temperature of the solution decreases
(ii) Temperature of the solution increases
(iii) Temperature of the solution remains the same
(iv) Salt formation takes place
Choose the options given below:
(a) (i) and (iv)
(b) (i) and (iii)
(c) (ii) only
(d) (ii) and (iv)
Option d – (ii) and (iv)
When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to:
(a) Absorb the evolved gas
(b) Moisten the gas
(c) Absorb moisture from the gas
(d) Absorb Cl⁻ ions from the evolved gas
Option c – Absorb moisture from the gas
Which one of the following Salts does not contain water of crystallisation?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Option b – Baking soda
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