Kerala Syllabus Class 10 Chemistry Model Question Paper Set 3

Practicing Chemistry Question Paper Class 10 Kerala Syllabus Set 3 English Medium helps identify strengths and weaknesses in a subject.

Chemistry Class 10 Kerala Syllabus Model Question Paper Set 3

Time: 1½ Hours
Score: 40 Marks

Instructions:

1. First 15 minutes is given as cool.of time.
2. This time is to be spent for reading the question paper.
3. Answer according to the instructions
4. Answer the questions considering the score and time.

I. Answer any 4 Questions from 1 to 5. Each carries 1 Score. (4 × 1 = 4)

Question 1.
Aluminium is manufactured by dissolving alumina in ………. during electrolysis.
Answer:
Sodium hydroxide/NaOH

Question 2.
2 SO₂ + O₂ ⇌ 2 SO₃ Name the catalyst used in this reaction
Answer:
V₂ O₅/ Vanadium Pentoxide

Question 3.
Name the scientist who proved the relationship between the volume and temperature of a gas.
(Robert Boyle, Jacques charles, Amedeo Avogadro, Michael Faraday)
Answer:
Jacquades Charles

Question 4.
Which is the element formed when moltern sodium chloride (NaCl) undergoes electrolysis
Answer:
Chlorine/Cl₂

Question 5.
Find out the relation
No. of subshells in M shell = 3
No. of subshells in K shell = ……………
Answer:
1

II. Answer any 4 Questions from 6 to 10. Each carries 2 Score. (4 × 2 = 8)

Question 6.
Molecular formula of some hydro carbons are given below
(i) C₃H₈
(ii) C₃H₆
(iii) C₄H₈
(iv) C₄H₆
a) Which of the elements belong to the same homologous series?
b) Write the general formula of the series.
Answer:
a) ii & iii/C₃ H₆, C₄H₈
b) C₆H_2n

Question 7.
The electronic configuration of an element A is given in two ways (Symbol is not real)
i) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹
ii) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s
a) Find out the correct electronic configuration of the element “A”.
b) To which block of the periodic table does this element belong?
Answer:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
b) S – Block

Question 8.
Atomic mass of oxygen is 16.
a) 1 GAM of oxygen is ………….
b) What is the mass of 4 × 6.022 × 10²³ oxygen atom?
Answer:
a) 16 g
b) 64 g

Question 9.
Which of the following equilibria is not affected by change in pressure? Why
a) 2NO(g) + O₂(g) ⇌ 2NO₂(g)
b) N₂(g) + O₂(g) ⇌ 2 NO(g)
Answer:
b) N₂(g) + O₂(g) ⇌ 2 NO(g)
There is no difference in the number of molecules of reactants and products

Question 10.
Order of reactivity of some metals are given Mg > Zn > Fe > Cu > Ag > Au
a) Which one of the given metal will displace Cu from CuSO, solution? (Au, Ag, Fe)
b) Write the equation for the redox reaction taking place here.
Answer:
a) Fe
b) Fe + Cu²⁺ → Fe²⁺ + Cu

III. Answer any 4 Questions from 11 to 15. Each carries 3 Score. (4 × 3 = 12)

Question 11.
A, B and C are cylinders with a volume of 11.2 L each. At STP the gases H₂, O₂ and N₂ are filled in A, B and C respectively.
a) Calculate the number of moles of H₂ molecules filled in A?
b) Calculate the number of molecules of O₂ filled in B
c) Calculate the mass of N₂ if the volume of nitrogen gas filled in ‘C’ is doubled?
(Hints: Atomic Mass – H = 1, O = 16, N = 14)
Answer:
a) 1/2 / 0.5
b) 1/2 × 6.022 × 10
c) 28g

Question 12.
n CH₂ = CHCl → A
a) Write the name of the compound ‘A’?
b) Which kind of chemical reaction is this?
c) Write any use of this compound.
Answer:

b) Polymerization
c) Manufacturing of pipes

Question 13.
a) Name the electrolyte used to coat silver on iron nail.
b) Which substance is used as anode in the electrolytic cell?
c) Write the equation of the reaction taking place at the cathode.
Answer:
a) Silver nitrate solution / Sodium cyanide + Silver cyanide solution
b) Silver
c) Ag⁺ + 1e → Ag

Question 14.

a) How many carbon atoms are there in the main chain?
b) Write the name of the branches?
c) Write the IUPAC name of the compound
Answer:
a) 6
b) Methyl
c) 3. 4 di methyl hexane

Question 15.
Analyse the table and answer the questions

Metal	Method of refining
Tin	X
Mercury	Y

a) Identify X and Y
b) Which property of metals is used in the above refining process?
Answer:
a) X – Liquation
Y – Distillation
b) Melting point of tin is lower than its impurities
Boiling point of zinc is lower than its impurities.

Answer any 4 Questions from 16 to 20. Each carries 4 Score. (4 × 4 = 16)

Question 16.
The chemical equation for the preparation of alcohol from sugar is given below.

(a) Write the names of the compounds A and B?
(b) What is the name of the alcohol formed here?
(c) How to convert this alcohol into rectified spirit?
(d) How to make power alcohol?
Answer:
a) A- Glucose
B – Fructose
b) Vash
c) Fractional distillation
d) Mixture of absolute alcohol with petrol

Question 17.
Complete the following equation related with the manufacture of sulphuric acid.

(i) Write a, b and c :
(ii) How to prepare sulphuric acid from oleum?
Answer:
i) a – SO₂
b – V₂O₅
c – H₂S₂O₇
ii) Oleum dissolved in water

Question 18.
Structure of an organic compound is given. CH₃ – O – CH₃
a) Write the IUPAC name of the compound.
b) Write the general name of the compounds with this functional group?
c) Give the structural formula of the functional isomer of the given compound and write its IUPAC name.
Answer:
a) Methoxy Methane
b) Ethers
c) CH₂ – CH₂ – OH, Ethanol

Question 19.
Electronic configurations of some elements are given below. (Symbol is not real)
P – 1s² 2s² 2p⁶ 3s¹
Q – 1 s² 2s² 2p⁶ 3s² 3p⁶ 4s²
R – 1s² 2s² 2 p⁶ 3 s² 3 p⁶3 d⁶ 4 s²
a) Write the atomic number of P.
b) In which subshell of the element ‘R’, last electron filling takes place?
c) Find out the period number and group number of element ‘Q’?
Answer:
a) 11
b) 3d
c) Period Number = 4. Group number = 2

Question 20.
a) Choose the suitable materials from the following and illustrate the construction of the
galvanic cell.
Materials
Metal Rods: Zn, Cu, Ag. Fe
Solutions: MgSO₄, NaCl, CuSO₄, FeSO₄
Others – Filter paper, connection wire, voltmeter.
b) Which is the anode of the cell?
c) Write down the equation for the redox reaction takes place in the cell?
Answer: