ICSE Specimen Class 10 Chemistry Sample Paper 2024 Solution
ICSE Board Class 10 Chemistry Sample Paper 2024 Solution www.cisce.org. New Sample Paper Solution ICSE Board 2024 Chemistry all Question Answers by Expert Teachers. Students of Class X who are preparing for Board Exam 2024 can solved here Chemistry Sample Paper.
(i) An aqueous solution of copper sulphate turns colourless on electrolysis.
Which of the following could be the electrodes?
anode: copper; cathode: copper
anode: platinum; cathode: copper
anode: copper; cathode: platinum
(a) only P
(b) only Q
(c) only R
(d) both Q and R
Answer :(b) only Q
(ii) A compound P is heated in a test tube with sodium hydroxide solution. A red litmuspaper held at the mouth of the test tube turns blue.
Which of the following could compound P be?
(a) zincsulphate
(b) coppersulphate
(c) ferroussulphate
(d) ammoniumsulphate
Answer :(d) ammonium sulphate (Due to NH4+ ions)
(iii) The atomic masses of sulphur (S), oxygen (O), and helium (He) are approximately32, 16, and 4 respectively.
Which of the following statements regarding the number of atoms in 32 g of sulphur,
16 g of oxygen, and 4 g of helium is correct?
16 g of oxygen contains four times the number of atoms as 4 g of helium.
16 g of oxygen contains half the number of atoms as 32 g of sulphur.
(a) only P
(b) only Q
(c) both P and Q
(d) neither P nor Q
Answer :(d) neither P nor Q
S = 32
O = 16
4e = 4
Given mass /molecular mass = no of atoms/NA
- S = NA
- O = 16/16 = no of atoms/NA
= NA
- He = 4/4 = no of atoms/4A
= NA
All contains NA (6.023 × 1023) no of atoms
(iv) Ammonia gas is passed through quicklime and then collected in a jar. Red and blue litmus papers are placed in the jar. W, X, Y and Z are the four observations. Which of the above observations correctly shows the reaction of the litmus papers to ammonia?
Red litmus paper | Blue litmus paper | |
W | turns blue | remains blue |
X | remains red | remains blue |
Y | remains red | turns red |
Z | turns blue | turns red |
(a) W
(b) X
(c) Y
(d) Z
Answer :(a) W
The reaction involves liberation of ammonium hydroxide which is basic in nature and a salt
(v) Glucose reacts with concentrated sulphuric acid to give a very pure form of carbon called sugar charcoal.
The reaction taking place is:
(a) oxidation
(b) combustion
(c) dehydration
(d) combination
Answer :(c) dehydration
Sulphuric acid is a dehydrating agent.
(vi) In which of the following electrolytic cells [P, Q, R or S] will silver plating be done on the spoon?
(a) P
(b) Q
(c) R
(d) S
Answer :(b) Q
Ag from the plate will deposit on spoon
Ag – Ag+ at Anode
Ag+ + le atspoon (cathode)
(vii) The basicity of acetic acid is:
(a) 1
(b) 2
(c) 3
(d) 4
Answer :(a) 1
CH3 – C – O – H, Only one H+ ion can be released
∴basicity is 1
(viii) A → A+3; B → B-1
Number of electrons present in the outermost shell of atoms A and B respectively are:
(a) 5, 1
(b) 3, 1
(c) 3, 7
(d) 5, 7
Answer : (b) 3, 1
A → A+3; B → B-1
A+3 + 3e → A ξ B + lr → B-1
∴ (b) 3, 1
(ix) A __________ solution is observed after placing Magnesium metal in a solution of Copper sulphate for half an hour.
(a) Blue
(b) Colourless
(c) Reddish brown
(d) Dirty green
Answer :
Mg + CuSO4 → MgSO4 + Cu
↓
White
(x) An element with atomic no. __________ will form an acidic oxide.
(a) 3
(b) 17
(c) 11
(d) 13
Answer :(b) 17
Chlorine has an atomic number of 17
Cl2 + H2O → H4 + HOCl (acidic in nature)
(xi) Which of the following is NOT true with respect to nitric acid?
(a) It is a strong reducing agent
(b) It is a strong oxidizing agent
(c) It is unstable to heat
(d) It liberates sulphur dioxide gas when treated with potassium sulphite
Answer : (d) It liberates sulphur dioxide gas when treated with potassium sulphite.
No, the following reaction take place when HHO3 reacts with K2So3
2HNO + 2K2SO3 + H2O → 2NO + 3H2O + K2SO4 + 2KNO3
SO2 gas is not involved here.
(xii) __________ is the functional group in methanol.
(a) >C=O
(b) –OH
(c) –CHO
(d) –COOH
Answer : (b) –OH
Methanol structure
The functional group is Alcohol.
(xiii) The process of electrolysis is an example of:
(a) Oxidation reaction
(b) Reduction reaction
(c) Redox reaction
(d) Displacement reaction
Answer : (c) Redox reaction
Reduction as well as oxidation, both take place simultaneously.
RED CAT → Reduction at cathode
AN OX → Oxidation at Anode
(xiv) The catalyst used in Ostwald’s process is ___________.
(a) Finely divided iron
(b) Graphite
(c) Vanadium pentoxide
(d) Platinum
Answer :(d) Platinum
It decreases the value of activation energy, thus increasing the rate of reaction.
(xv) An element belongs to third period and sixteenth group. It will have __________electrons in its valence shell.
(a) 2
(b) 5
(c) 6
(d) 3
Answer : (c) 6
Sulphur belongs to 16th group and 3rd period
S16 → 2, 8, (6) → value ε0
Question 2 :
(i) The setup shown below is that of the fountain experiment with hydrogen chloride gas in the flask.
The fountain starts when a few drops of water from the dropper are introduced into the flask. Instead of the drops of water, Pooja started the fountain by introducing a few drops of Sodium hydroxide into the flask.
(a) Explain why the litmus solution gets sucked up when Sodium hydroxide is used.
(b) What will be the colour of the fountain when Sodium hydroxide is used? Justify your answer.
(c) If instead of HCl gas, ammonia gas is filled in the flask and water is introduced from the dropper, will there be a different observation? Justify your answer.
Answer :
(i) – (a) Let’s understand the reactionfirst :
HCl + NaOH → H2O + Nacl
This reaction is exothermic in nature and due to this heat, water start to convert into steam. Due to which, pressure also starts building up which is more than the atmospheric pressure making the solution escape flask.
(b) Blue solution will be observed if NaOH is used as NaOH will have a higher Ph and will turn the solution basic.
(c) Practically, you will see no reaction because NH3 and water does not react with each other.
NH3 + H2O → NH4OH
The solution produced will be basic in nature.
(ii) Match the following Column A with Column B.
Column A | Column B |
(a) Aluminium | 1. Covalent compound |
(b) Sulphuric acid | 2. Carbonate ore |
(c) Calcination | 3. Hall Heroult’s process |
(d) Calcium Chloride | 4. Contact Process |
(e) Carbon tetrachloride | 5. Electrovalent compound |
Answer :
(a) Aluminium → 3. Hall Heroult’s process
(b) Sulphuric acid → 4. Contact Process
(c) Calcination → 2. Carbonate ore
(d) Calcium Chloride → 5. Electrovalent compound
(e) Carbon tetrachloride → 1. Covalent compound.
(iii) Complete the following by choosing the correct answers from the bracket:
(a) If an element has one electron in the outermost shell then it is likely to have the ___________ [smallest/ largest] atomic size amongst all the elements in the same period.
(b) ___________ [sulphuric acid/ hydrochloric acid] does not form an acid salt.
(c) A __________ [reddish brown/ dirty green] coloured precipitate is formed when ammonium hydroxide is added to a solution of ferric chloride.
(d) Alkanes undergo __________ [addition/ substitution] reactions.
(e) An __________ [alkaline/acidic] solution will turn methyl orange solution pink.
Answer :
(iii) – (a) Largest,
Because of like no of e° and P+ nuclear force of attraction
(b)
(c) Reddish brown
FeCl3 + 3 NH4Cl → Fe(OHH)3 + NH4Cl
(d) Substitutions
Alkanes cannot exhibit addition reaction.
(e) Alkaline
Methyl orange turns red in acidic solution
(iv) Identify the following:
(a) A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.
(b) A salt formed by the complete neutralization of an acid by a base.
(c) A reaction in which the hydrogen of an alkane is replaced by a halogen.
(d) The energy required to remove an electron from a neutral gaseous atom.
(e) A homogenous mixture of two or more metals or a metal and a non-metal in a definite proportion in their molten state.
Answer :
(a) Covalent bond
It is formed by neutral sharing of e° between two atoms.
(b) Neutral salt
When acid and base reacts, they from salt and water and both have a neutral Ph = 7
(c) Free radical chlorination/constitution reaction
Ch4 + Cl2 → CH3Cl + HCL
(d) Ionization enthalpy
Metals generally lose e° and non-nuclear accept to form ad ionic compound.
(e) Alloy.
Used in various places such as homes (street), engineering construction etc. This process improves the strength and durability of any metal.
(v) (a) Draw the structural diagram for the following compounds:
(1) 1- propanal
(2.) 1, 2 dichloro ethane
(3) But-2-ene
(b) Give the IUPAC name of the following organic compounds:
Answer :
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