Kerala SSLC Chemistry Question Paper March 2022 with Answers English Medium

Students can read Kerala SSLC Chemistry Question Paper March 2022 with Answers English Medium and Kerala SSLC Chemistry Previous Year Question Papers with Answers helps you to score more marks in your examinations.

Kerala Syllabus Class 10 Chemistry Question Paper March 2022 with Answers English Medium

Time: 1½ Hours
Total Score: 40

Instructions:

• There is a ‘Cool-off time’ of 15 minutes in addition to the writing time.
• Use this time to get familiar with questions and to plan your answers.
• Questions with different scores are given as distinct parts.
• Read the instructions carefully before answering the questions.
• Keep in mind, the score and time while answering the questions.
• The maximum score for questions from 1 to 24 will be 40.

Part – I

A. Answer any four questions from 1 to 6. Each carries 1 score. (4 × 1 = 4)

Question 1.
Identify the compound which contains a carbon-carbon triple bond. (1)
(C₅H₁₂, C₂H₂, C₃H₆, CH₄)
Answer:
C₂H₂

Question 2.
Which one of the following subshells has the highest energy? (1)
(1s, 3d, 4s, 3p)
Answer:
3d

Question 3.
Find the relation and fill up suitably.
(a) Tin Stone: Magnetic separation
(b) Bauxite: _____________
Answer:
Leaching

Question 4.
Which gas is produced when metals react with dilute hydrochloric acid? (1)
Answer:
Hydrogen

Question 5.
1 GMM of a substance contains _____________ several molecules. (1)
Answer:
6.022 × 10²³

Question 6.
What happens to the rates of forward and backward reaction at the equilibrium point? (1)
Answer:
The rate of forward and backward reactions becomes equal.

B. Answer all questions from 7 to 9. Each carries 1 score. (3 × 1 = 3)

Question 7.
Which metal is deposited at the cathode, when molten sodium chloride is electrolyzed? (1)
(Sodium, Hydrogen, Chlorine, Calcium)
Answer:
Sodium

Question 8.
How many electrons are donated by first-group elements generally in chemical reactions? (1)
(1, 2, 3, 4)
Answer:
1

Question 9.
In which electrode aluminium metal is produced during the electrolysis of Alumina? (1)
Answer:
Cathode

Part – II

A. Answer the following question. Carries 2 scores. (1 × 2 = 2)

Question 10.
(a) Which are the two compounds formed when Ammonium Chloride (NH₄Cl) is strongly heated? (1)
(b) Write the chemical equation for this reaction. (1)
Answer:
(a) Ammonia (NH₃) and Hydrogen chloride (HCl)
(b) NH₄Cl → NH₃ + HCl

B. Answer any one question from 11 to 12. (1 × 2 = 2)

Question 11.
Find the mass of 44.8 L of NH₃ kept at STP. (2)
(Hint: Atomic mass N = 14, H = 1)
Answer:
Molecular Mass of NH₃ = 14 + (3 × 1)
= 14 + 3
= 17
Mass of 22.4 L NH₃ = 17 g
∴ Mass of 44.8 L NH₃ = 17 × 2 = 34 g

Question 12.
(a) What is electroplating? (1)
(b) Which is the electrolyte used in the electroplating of copper on an iron bangle? (1)
Answer:
(a) Electroplating is the process of coating one metal over another using the method of electrolysis.
(b) Copper Sulphate Solution (CuSO₄)

Part – III

Answer any three questions from 13 to 16. Each carries 3 scores. (3 × 3 = 9)

Question 13.
(a) Atomic number of an element is 17. Write its subshell electronic configuration. (1)
(b) Find the group number and period number of this element in the periodic table. (2)
Answer:
(a) 1s² 2s² 2p⁶ 3s² 3p⁵
(b) Group Number = 17
Period Number = 3

Question 14.
(a) Molten iron obtained from the blast furnace contains 4% carbon and other impurities. What is this known as? (1)
(b) Which alloy steel is used for making permanent magnets? (1)
(c) Some alloy steels contain the same component. Then how do they possess different properties? (1)
Answer:
(a) Pig iron
(b) Alnico
(c) The percentage of component elements are different.

Question 15.
N₂ (g) + 3H₂ (g) \(\rightleftharpoons\) 2NH₃ (g) + Heat
How do the following changes influence the amount of the product?
(a) Temperature decreases. (1)
(b) Pressure increases. (1)
(c) Ammonia produced is removed continuously from the system. (1)
Answer:
(a) The amount of the product increases because the forward reaction is exothermic.
(b) The amount of the products increases because due to forward reaction number of molecules decreases.
(c) The amount of the product increases because the concentration of the reactants increases.

Question 16.
(X) CH₄ + 2O₂ → _______ + 2H₂O + Heat
(Y) nCF₂ = CF₂ → [-CF₂ – CF₂-] (Teflon)
(a) Complete the chemical equation X. (1)
(b) Name the reaction Y. (1)
(c) Write any one use of Teflon. (1)
Answer:
(a) CH₄ + 2O₂ → CO₂ + 2H₂O + Heat
(b) Polymerisation
(c) Used to coat the inner surface of nonstick cookware.

B. Answer the following questions carries 3 scores. (1 × 3 = 3)

Question 17.
(i) CH₃ – CH₂ – CH₂ – CH₃
(ii) CH₃ – CH₂ – CH₂ – CH₂ – OH
(iii) CH₃ – CH₂ – O – CH₂ – CH₃
(iv) CH₃ – CH₂ – CH₃
(a) Identify the isomer pair in the given compounds. (1)
(b) Name the isomerism. (1)
(c) How many isomers are possible for compound (i)? (1)
Answer:
(a) (ii) CH₃ – CH₂ – CH₂ – CH₂ – OH
(iii) CH₃ – CH₂ – O – CH₂ – CH₃
(b) Functional Group Isomerism
(c) Two

Part – IV

A. Answer any 2 questions from 18 to 20. Each carries 4 scores. (2 × 4 = 8)

Question 18.

A and B represent two gas cylinders. The gas in cylinder A is completely transferred to cylinder B, keeping the temperature constant.
(a) Compare the gas pressure in cylinder A and Cylinder B. (1)
(b) Which gas law is related to this? (1)
(c) 10 L of gas is kept in a cylinder at 2 atm pressure.
Keeping the temperature constant, the gas is completely transferred to a 20 L cylinder. What is the new pressure of the gas? (2)
Answer:
(a) Pressure in cylinder ‘B’ is greater than that of ‘A’. (Because the volume of B is less than that of A)
(b) Boyle’s law
(c) 1 atm
P₁ = 2 atm, V₁ = 10 L
P₂ = x, V₂ = 20 L
P₁V₁ = P₂V₂
⇒ 2 × 10 = x × 20
⇒ x = \(\frac{2 \times 10}{20}\) = 1

Question 19.
Haematite is converted into iron by reactions taking place in a blast furnace.
(a) Write the molecular formula of Haematite. (1)
(b) Which substance acts as the reducing agent in this process? (1)
(c) Molten iron is produced along with slag from the furnace. What is meant by slag? (1)
(d) Write the chemical equation that shows the formation of slag. (1)
Answer:
(a) Fe₂O₃
(b) Carbon Monoxide (CO)
(c) Slag is the substance formed when the flux reacts with the gangue.
Gangue + Flux → Slag
(d) CaO + SiO₂ → CaSiO₃

Question 20.

(a) How many carbon atoms are there in the longest chain of this hydrocarbon? (1)
(b) Give the name of the branch. (1)
(c) What is the position number of the branch? (1)
(d) Write the IUPAC name of the compound. (1)
Answer:
(a) 5
(b) Methyl
(c) 2
(d) 2-Methyl Pentane

B. Answer any one question from 21 to 22. (1 × 4 = 4)

Question 21.
(a) The industrial preparation of sulphuric acid is known as _____________ (1)
(b) Which is the catalyst used in this process? (1)
(c) Take some sugar in a watch glass and add a few drops of concentrated sulphuric acid to it. What is your observation? Which chemical property of sulphuric acid is shown here? (2)
Answer:
(a) Contact process
(b) Vanadium pentoxide (V₂O₅)
(c) Sugar gets charred. Carbon dioxide and water vapour evolve. Carbon is left behind.
Dehydrating nature.

Question 22.
Choose the compounds from the box and answer the following questions.
CH₃COOH, CH₃ – COO – CH₂ – CH₃, CH₃ – CH₂ – OH, C₁₂H₂₂O₁₁
(a) Which is a Carboxylic acid? (1)
(b) Which compound is an ester? (1)
(c) Identify ethanol. (1)
(d) Which substance is used in the industrial preparation of ethanol? (1)
Answer:
(a) CH₃COOH
(b) CH₃-COO-CH₂-CH₃
(c) CH₃-CH₂-OH
(d) C₁₂H₂₂O₁₁

Part – V

A. Answer anyone from 23 to 24. Each carries 5 scores. (1 × 5 = 5)

Question 23.
The atomic number of Manganese (Mn) is 25.
(a) Write the subshell electronic configuration of Mn. (1)
(b) Find the block of Mn in the periodic table. (1)
(c) Which category of elements does Mn belong? (1)
(Transition element, Halogens, Noble gases, Alkaline earth metals)
(d) What is the oxidation number of Mn in MnO₂? (1)
(Oxidation number of oxygen is -2)
(e) Write the subshell electronic configuration of Mn²⁺. (1)
Answer:
(a) ₂₅Mn = 1s² 2s² 2p⁶, 3s² 3p⁶ 3d⁵, 4s²
(b) d-block
(c) Transition Element
(d) +4
(e) Mn²⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵

Question 24.
A picture of a galvanic cell is given below:

(a) What is the energy change taking place in a galvanic cell? (1)
(b) Identify the anode in the given cell. (1)
(c) Write the chemical equation of the reaction taking place at the anode. (1)
(d) In which electrode does oxidation take place? (1)
(e) Write the chemical equation of the redox reaction in the cell. (1)
Answer:
(a) Chemical energy changes into electrical energy.
(b) Zn rod
(c) Zn → Zn²⁺ + 2e^–
(d) Anode (Zn)
(e) Zn + Cu²⁺ → Zn²⁺ + Cu