Kerala Syllabus Class 10 Chemistry Model Question Paper Set 1

Practicing Chemistry Question Paper Class 10 Kerala Syllabus Set 1 English Medium helps identify strengths and weaknesses in a subject.

Chemistry Class 10 Kerala Syllabus Model Question Paper Set 1

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.
Which is the ore of Aluminium
Answer:
Bauxite

Question 2.
Some subshells are given. Find out the subshells which are not possible.
(3s, 3f, 3d, 2p)
Answer:
3f

Question 3.
Which of the given metal doesnot react with dil hydrochloric acid
(Na, Cu, Mg, Pb)
Answer:
Cu

Question 4.
Find out the relation
1.GMM Oxygen = 32 g
1 GAM Oxygen =…… g
Answer:
16g

Question 5.
During the industrial preparation of ammonia ……………… is taken as optimum temperature.
Answer:
450° c

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

Question 6.
Which of the following is not a characteristics of ‘d’ block elements?
(i) Elements form Coloured Compounds.
(ii) Including metals and non-metals.
(iii) In these elements, last electron filling takes place at the outermost subshell.
(iv) Elements show different Oxidation state.
Answer:
ii) Including metals and non metals
iii) In these elements last electron filling takes place at the outermost subshell

Question 7.
The element ‘X’ with 5 GAM has a mass of 80 g.
(Symbol is not real)
a. How many number of atoms are present in 80g of ‘X’?
b. How many grams of helium are to be taken to get as many molecules as there in 5 GAM X? (Atomic mass of helium is 4)
Answer:
a) 5 × 6.022 × 10²³
b) 20g

Question 8.
Froth floatation, Hydraulic washing, Magnetic Separation, leaching etc….. are the methods used to concentrate the ore.
Which method is used to concentrate copper pyrites? Give the reason for choosing this method.
Answer:
Froth floatation.
The ore has low density than impurities.

Question 9.
C₂H₆, A C₄H₁₀ etc are the members of a homologous series.
a) Write the molecular formula of ‘A’?
b) To which homologous series do these compounds belong?
Answer:
a) C₃ H₈
b) Alkane

Question 10.
Sulphuric acid is known as king of chemicals,
a) Name the process of the industrial manufacturing of Sulphuric acid?
b) Which is the Catalyst used in this process?
Answer:
a) Contact process
b) V₂ O₅ / Vanadium pentoxide

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

Question 11.
a) What happens to the size of a gas bubble rising from the bottom of a water body? Why?
b) Which is the gas law associated with this?
Answer:
a) Size increases. As the bubbles move from bottom to top in a water body, pressure decreases and correspondingly the volume ncreases
b) Boyle’s Law

Question 12.
Diagram of a cell is given below

a) What is the energy change taking place in the cell?
b) Write the equation for the chemical reaction takes place at anode
c) Write any two instances where electrolysis is made use of
Answer:
a) Electrical energy is converted to chemical energy
b) Na⁺ + 1e^– → Na
c) Manufacturing of metals / non metals / Refining of metals / Electroplating

Question 13.
The production of aluminium is different from that of Iron.
a) Which is the reducing agent used in the production of Aluminium?
b) Name the furnace used in the production of iron.
c) Write the name of the gangue present in the ore of iron
Answer:
a) Electricity
b) Blast furnace
c) SiO₂ / Silicon dioxide

Question 14.
Two chemical reactions are given below
A) CH₂ = CH₂ + H₂ → X
B) X + Cl₂ → Y + HCl
i) Write the molecular formula of the compounds X and Y
ii) By which name is the chemical reaction ‘B’ known?
Answer:
i) X – CH₃ – CH₃
Y – CH₃ – CH₂Cl
ii) Displacement reaction

Question 15.

a) How many Carbon atoms are there in the main chain?
b) Give the position of the branches.
c) Write the IUPAC name of the Compound?
Answer:
a) 5
b) 2, 3
c) 2, 3 – dimethyl pentane

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

Question 16.
The element A belong to the 2nd period and 17th group and the element B belongs to 3rd
period and 2nd group of the periodic table (Symbols are not real)
i) Write the Sub shell electronic configuration of A.
ii) To which block does B belong? What is its valency?
iii) Give the formula of the compound formed by A and B.
Answer:
i) 1s² 2s² 2p⁵
ii) S – block, 2
iii) BA₂

Question 17.
Structural formula of home compounds are given.
1. CH₃ – CH₂ – COO – CH₃
2. CH₃ – CH₂ – COOH
3. CH₃ – CH₂ – O – CH₃
4. CH₃ – OH
5. CH₃ – CH₂ – CO – CH₃
a) Which one of the above compounds represent an ester. Write the IUPAC name.
b) Name the Compounds needed to prepare the ester
c) Write down the equation for the above reaction.
Answer:
a) 1 CH – CH₂ – COO – CH₃
b) CH₃ – CH₂ – COOH. CH₃ – OH
C) CH₃ – CH₂ – COOH + HO – CH → CH – CH – COO – CH₃

Question 18.
A, B, C are three gases. 1 mole of A reacts reversibly with 1 mole of B to form 2 mole of C.
a) Write the equation for the above reaction?
b) What will be the effect of pressure on this system when it attains equilibrium?
c) What will happen to the equilibrium when more amount of A is added to the system.
Answer:
a) A + B ⇌ 2 C
b) No. There is no difference in the number of atoms in the reactant and product side
c) increase the rate of forward reaction

Question 19.
Structural formula of some organic compounds are given below.
i) CH₃ – COOH
ii) CH₂ – CH₂ – CH₂ – OH
iii) CH₃ – O – CH₂ – CH₂ – CH₃
a) Write the names of the functional groups from these compounds.
b) Write the IUPAC name and structure of the functional isomer of CH₃ – CH₂ – CH₂ – OH.
Answer:
a) Carboxylic group / Hydroxyl group / Alkoxy group
b) CH₃ – CH₂ – O CH₃ / Methoxy Ethane

Question 20.
The equation of the redox reaction taking place in a Galvanic cell is given below.
Fe + Cu²⁺
→ Fe²⁺ + Cu.
a. Draw the figure of the Galvanic cell.
b. Which is the cathode in this cell? Write down the equation for the reaction takes place at cathode.
Answer: