Kerala SSLC Chemistry Question Paper March 2024 with Answers English Medium

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Kerala Syllabus Class 10 Chemistry Question Paper March 2024 with Answers English Medium

Time: 1½ Hours
Total Score: 40

Instructions:

• The first 15 minutes is cool-off time.
• You may use this time to read the questions and plan your answers.
• Answer only based on instructions and questions given.
• Consider score and time while answering.

Section – A

Answer any 4 questions from 1 to 5. Each question carries 1 score. (4 × 1 = 4)

Question 1.
f-block elements which belong to 7th period are known as _______________
(Transition elements, Lanthanoids, Halogens, Actinoids)
Answer:
Actinoids

Question 2.
Write the name of the byproduct obtained in the industrial production of Soap.
Answer:
Glycerol

Question 3.
The ore of a metal is lighter than the impurities. Which method is suitable for its concentration?
(Levigation, Froth Floatation, Magnetic Separation, Leaching)
Answer:
Froth Floatation

Question 4.
When ammonium chloride is heated, a gas with a basic nature is obtained. Write the name of the gas.
Answer:
Ammonia

Question 5.
Which product is obtained at the cathode when sodium chloride solution is electrolyzed?
(Na, Cl₂, O₂, H₂)
Answer:
H₂

Section – B

Answer any 4 questions from 6 to 10. Each question carries 2 scores. (4 × 2 = 8)

Question 6.
Stainless steel, Nichrome, and Alnico are alloy steels.
(a) Which alloy steel is used to produce heating coils?
(b) Identify the alloy steels having the same components among these.
Answer:
(a) Nichrome
(b) Stainless Steel and Nichrome

Question 7.
(a) The oxidation state of Mn in MnO₂ is 4. Find out the oxidation state of Mn in Mn₂O₃.
(Hint: Oxidation state of oxygen = -2)
(b) Transition elements show variable oxidation state. Why?
Answer:
(a) Mn₂O₃
2x – 6 = 0 ⇒ x = +3
(b) In the case of transition elements, along with outermost s electrons, the d electrons from the penultimate shell are also lost, as the energies of these subshells are almost equal.

Question 8.
The molecular formula of a hydrocarbon is C₄H₈.
(a) To which category does this hydrocarbon belong?
[Alkane, Alkene, Alkyne]
(b) Draw the structure of an alicyclic hydrocarbon with the same molecular formula.
Answer:
(a) Alkene

Question 9.
Analyze the picture and answer the following questions.

(a) What will be the pressure when the volume of this gas is increased to 4L at 300K?
(b) What is the gas law related to this?
Answer:
(a) P₁ = 2 atm; V₁ = 2L; V₂ = 4L
P₁V₁ = P₂V₂
P₂ = \(\frac{2 \times 2}{4}\) = 1 atm
(b) Boyle’s Law

Question 10.
Choose the right compounds from the given box to answer the following questions.
(i) CH₃ – CH₂ – OH
(ii) CH₃ – CH₂ – COOH
(iii) CH₃ – CH₂ – CO – CH₃
(iv) CH₃ – COOH
(v) CH₃ – OH
(vi) CH₃ – CH₂ – COO – CH₃
(a) Which among these is an ester?
(b) Which are the compounds required to prepare this ester?
Answer:
(a) (vi) CH₃ – CH₂ – COO – CH₃
(b) (ii) CH₃ – CH₂ – COOH
(v) CH₃ – OH

Section – C

Answer any 4 questions from 11 to 15. Each question carries 3 scores. (4 × 3 = 12)

Question 11.
Sulphuric acid is called the king of chemicals.
(a) Industrial preparation of sulphuric acid is known as _______________
(b) Which is the catalyst used in this process?
(c) A black substance is formed When concentrated sulphuric acid is added to sugar. Explain the reason for this observation.
Answer:
(a) Contact Process
(b) Vanadium Pentoxide (V₂O₅)
(c) Dehydrating nature of sulphuric acid.
Sulphuric acid absorbs hydrogen and oxygen in the form of water from sugar (C₁₂H₂₂O₁₁).

Question 12.
Silver is coated on a copper bangle by electroplating.
(a) Which metal is connected to the negative terminal of the battery in this process?
(b) Which is the electrolyte used here?
(c) Write the chemical equation of the reaction that takes place at the positive electrode.
Answer:
(a) Copper
(b) Silver Nitrate (AgNO₃) / Sodium Cyanide + Silver Cyanide Solution
(c) Ag → Ag⁺ + 1e^–

Question 13.
The structural formula of a hydrocarbon is given below.

(a) How many carbon atoms are there in the main chain?
(b) Name the branch present in the compound.
(c) Write the IUPAC name of this compound.
Answer:
(a) 6 Carbons
(b) Methyl (-CH₃) group
(c) 3-Methylhexane

Question 14.
Aluminium is the most abundant metal on the earth’s crust.
(a) Which is the ore of aluminium?
(b) Describe the different steps in the concentration of this ore.
Answer:
(a) Bauxite (Al₂O₃.2H₂O)
(b) Concentration by Leaching

Question 15.
Complete the following equations.
(a) X + Cl₂ → CH₃ – CH₂Cl + HCl
(b) CH₃ – CH = CH₂ + Cl₂ → Y
(c) CH₃ – CH₂ – CH₃ \(\rightarrow{\text { Heat }}\) CH₄ + Z
Answer:
(a) X : CH₃ – CH₃
CH₃ – CH₃ + Cl₂ → CH₃ – CH₂Cl + HCl
(b) Y : CH₃ – CHCl – CH₂Cl
CH₃ – CH = CH₂ + Cl₂ → CH₃ – CHCl – CH₂Cl
(c) Z : CH₂ = CH₂
CH₃ – CH₂ – CH₃ \(\rightarrow{\text { Heat }}\) CH₄ + CH₂ = CH₂

Section – D

Answer any 4 questions from 16 to 20. Each question carries 4 scores: (4 × 4 = 16)

Question 16.
The subshell electronic configuration of an element is given:
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²
(a) What is the atomic number of this element?
(b) Which subshell among these has the highest energy?
(c) Find out the period number and group number of this element.
Answer:
(a) 26
(b) 3d has the highest energy
(c) Period Number = 4
Group Number = 2 + 6 = 8

Question 17.
The structural formula of an organic compound is given:
CH₃ – CH₂ – O – CH₃
(a) The compounds having – O – R as the functional group are called _______________
(b) Write the molecular formula of this compound.
(c) Write the IUPAC name of this compound.
(d) Write the structural formula of the functional isomer of this compound.
Answer:
(a) Ether
(b) C₃H₈O
(c) Methoxyethane
(d) CH₃ – CH₂ – CH₂ – OH
or

Question 18.
(a) What is the volume of 1 mol ammonia gas (NH₃) at STP?
(b) Find the volume of 68 g ammonia gas at STP.
[Hint: Molecular Mass of NH₃ = 17]
(c) Find the number of molecules present in 68 g ammonia gas.
Answer:
(a) 22.4 L
(b) No. of moles \(=\frac{\text { Given mass }}{\text { GMM }}\)
= \(\frac{68}{17}\)
= 4 mole
Volume = Mole × 22.4
= 4 × 22.4
= 89.6 E
(c) No. of molecules = Mole × N_A
= 4N_A (4 × 6.022 × 10²³)

Question 19.
2NO (g) + O₂ (g) = 2NO₂ (g) + Heat
(a) When does a reversible reaction attain equilibrium?
(b) How do the following changes influence the amount of the product?
(i) Increase in temperature
(ii) Increase in pressure
(iii) NO₂ is removed from the system.
Answer:
(a) The system attains equilibrium when the rate of forward reaction becomes equal to the rate of backward reaction.
(b) (i) The amount of product decreases.
(ii) the amount of product increases.
(iii) amount of product increases.

Question 20.
The order of reactivity of some elements is given. Analyze it and answer the following questions.
Mg > Zn > Fe > Cu > Ag
(a) Name any one metal that cannot displace hydrogen from dilute hydrochloric acid.
(b) Which are the metals that can displace Fe from the FeSO₄ solution?
(c) A galvanic cell is constructed using Zn and Fe as electrodes.
(i) Which is the anode of this cell?
(ii) Write the equation of the chemical reaction taking place at the cathode.
Answer:
(a) Copper (Cu) or Silver (Ag)
(b) Mg and Zn
(c) (i) Zn
(ii) Fe²⁺ + 2e^– → Fe