ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 1
Sample Paper 7
ICSE Class X 2023-24
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.
6. The intended marks for questions or parts of questions are given in brackets [ ].
SECTION - A
(Attempt all questions from this Section.)
QUESTION 1.
Choose the correct answers to the questions from the given options. [15]
(Do not copy the questions, write the correct answer only.)
(i) Which apparatus could electroplate and iron nail with copper?
= Copper sheet = Iron nail
(a) (b)
(c) (d)
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 2
(ii) The salt in which the solution gives a pale green precipitate with sodium hydroxide solution
and a white precipitate with barium chloride solution is
(a) iron (III) sulphate (b) iron (II) sulphate
(c) iron (II) chloride (d) iron (III) chloride
(iii) If an element A belongs to period 3 and Group II then it will have :
(a) 3 shells and 2 valence electrons
(b) 2 shells and 3 valence electrons
(c) 3 shells and 3 valence electrons
(d) 2 shells and 2 valence electrons
(iv) A sample of soil is mixed with water and allowed to settle. The clean supernatant solution
turns the pH paper yellowish-orange. Which of the following would change the colour of this
pH paper to greenish-blue?
(a) Lemon juice (b) Antacid
(c) Common salt (d) Vinegar
(v) Which one of the following elements exhibit maximum number of valency electrons?
(a) P (b) Al
(c) Si (d) Na
(vi) Which of the following relation for E.F is correct :
(a) E.F = M.M # n
2 (b) E.F # M.M = n
(c) M.M # n = E.F (d) E.F = M. M
n
(vii) Which of the following hydroxides is not an alkali?
(a) Copper hydroxide (b) calcium hydroxide
(c) ammonium hydroxide (d) sodium hydroxide
(viii) The most distinctive property of the noble gases is that they are:
(a) Metallic (b) Unreactive
(c) Radioactive (d) Metalloid
(ix) The brown ring test is used for detection of :
(a) NO-3 (b) CO 2-
3
(c) SO 2-
3 (d) Cl-
(x) Number of shells across the period:
(a) Remains same (b) Decreases
(c) Increases (d) All of above
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 3
(xi) Black insoluble compound which on reacting with nitric acid turns into blue solution.
(a) Zinc Oxide [NH4NO3] (b) Ferric Oxide Fe2O3
(c) Titanium Oxide TiO2 (d) Copper Oxide CuO
(xii) The alkanes in which carbon atoms are not a continous chain are called .......... .
(a) structured (b) branched
(c) unsymmetric (d) symmetric
(xiii) The salt solution which does not react with ammonium hydroxide is :
(a) Calcium Nitrate (b) Zinc Nitrate
(c) Lead Nitrate (d) Copper Nitrate
(xiv) Liquid ammonia is used for refrigeration because it
(a) has a high dipole moment (b) is basic
(c) has a high heat of vaporisation (d) is a stable compound
(xv) On moving from left to right in a period in the periodic table, the size of the atom.
(a) decreases (b) increases
(c) does not change appreciably (d) first decreases and then increases
QUESTION 2.
(i) (a) Name the method used for obtaining ammonia on a large-scale. [5]
(b) What is the actual ratio of the reactants?
(c) Are the reactants necessarily taken in the same ratio ? Explain.
(d) The temperature used is 450°C. Explain why
(1) A lower temperature is not used.
(2) A higher temperature is not used.
(ii) Match the following column-A with column-B [5]
Column-A Column-B
(1) Promoter used in Haber’s process (a) 800° C
(2) Catalyst used in oxidation of ammonia (b) K2HgI4
(3) Drying agent for ammonia (c) Molybdenum
(4) A solution which gives brown colouration (d) Refrigent
with ammonium salts
(5) Temperature in Haber’s process (e) Platinum
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 4
(iii) Complete the following by choosing the correct answers from the bracket: [5]
(a) The similarities in the properties of group of elements are because they have the
same_____(electronic configuration, number of outer electrons, atomic numbers).
(b) The acid which cannot act as an oxidizing agent is______. (conc. H2SO4, conc.
HNO3, conc. HCl).
(c) Steel is an alloy of _____ (pure iron, pure zinc) and Carbon.
(d) Pure anhydrous acid is a _____ conductor of electricity. (good/bad)
(e) Aqueous solution of hydrogen chloride is ______ (basic/acidic).
(iv) Identify the following: [5]
(a) Electrolytic deposition of a superior metal on a baser metal.
(b) Agents which conduct electricity in a conductor.
(c) Process of extraction of metals from its ores by electrolysis.
(d) The process by which an electrovalent compound breaks up into mobile ions.
(e) The gas obtained when rock salt reacts with conc. Sulphuric acid.
(v) The molecules of alkene family are represented by a general formula CnH2n. Now answer the
following : [5]
(a) What do n and 2n signify ?
(b) What is the name of alkene when n = 4 ?
(c) What is the molecular formula of alkene when n = 6 ?
(d) What is the molecular formula of the alkene if there are six H-atoms in it ?
(e) What is the molecular formula and structural formula of the first member of the alkene
family ?
SECTION - B
(Attempt any four questions.)
QUESTION 3.
(i) List three characteristics of isomers. [2]
(ii) Which property of sulphuric acid is shown by the reaction of concentrated sulphuric acid
with : [2]
(a) Ethanol ?
(b) Carbon ?
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 5
(iii) What are the following groups known as ? Give two examples of each. [3]
(a) Group IA elements
(b) Group VII A elements
(c) Group zero elements.
(iv) (a) Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride.
Write the equation(s) for the reaction(s) which take place. [3]
(b) (1) What are the two steps to change lead carbonate to lead chloride?
(2) Give the name of a soluble salt of lead and write the equation for the action of heat
on this salt.
QUESTION 4.
(i) (a) Give the chemical name and formula of cryolite. [2]
(b) Complete and balance the following equation:
Al + NaOH + ______ $
(ii) Calculate the percentage of : [2]
(1) Fluorine
(2) Sodium and
in sodium aluminium fluoride [Na3AlF6], to the nearest whole number.
[Atomic Mass : Na = 23, Al = 27, F = 19]
(iii) List the properties of ammonia that make it : [3]
(1) A good refrigerant
(2) A cleaning agent
(3) As a source of hydrogen.
(iv) State your observation when: [3]
(1) Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture is heated.
(2) Dilute Hydrochloric acid is added to Copper carbonate.
(3) Dilute Hydrochloric acid is added to Sodium thiosulphate.
QUESTION 5.
(i) (a) Though Ammonium nitrite readily gives Nitrogen on heating, a mixture of Ammonium
chloride and Sodium nitrite in water is heated to prepare Nitrogen in the laboratory.
(b) Ammonia cannot be collected over water. [2]
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 6
(ii) (a) What do you understand by dibasic acid? Give an example. [2]
(b) How many types of salts does dibasic acid produce when it reacts with caustic soda
solution ? Give equations.
(iii) (a) State whether the following statements are True of False. Justify your answer. [3]
(1) According to Mendeleev, periodic properties of elements are periodic function of
their atomic number.
(2) Atomic number is equal to the number of protons.
(b) Calculate volume of O2 at S.T.P. required for the complete combustion of 10 litres of
carbon monoxide at the same temperature and pressure.
(iv) Write the equation for the following reactions. [3]
(a) Calcium carbide and water
(b) Ethene and water (steam)
(c) Bromoethane and an aqueous solution of sodium hydroxide.
QUESTION 6.
(i) What is the volume (in litres) at S.T.P. of [2]
(a) 16 g of Methane gas?
(b) 0.14 g of Carbon monoxide gas?
(ii) (a) Name the ions furnished by an acid. [2]
(b) Name two crystalline substances which don’t contain water of crystallisation.
(iii) (a) Study the diagram given below and answer the questions that follow : [3]
(1) Give the names of the electrodes A and B.
(2) Which electrode is the oxidising electrode?
(b) A strip of copper is placed in four different colourless salt solutions. They are KNO3,
AgNO3, Zn(NO3)2, Ca(NO3)2. Which one of the solutions will finally turn blue ?
(c) Write the equations of the reactions which take place at the cathode and anode when
acidified water is electrolysed.
Continue on Next Page...
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 7
(iv) (a) Positive electrode is called the_______. [3]
(b) The electron releasing tendency of zinc is______than that of copper.
(c) The conductivity of an electrolyte_____with rise in temperature.
QUESTION 7.
(i) Write balanced chemical equations: [3]
(a) Addition of Hydrogen to Ethyne.
(b) Burning of Methane in sufficient supply of air.
(c) Burning of Ethane in sufficient supply of air.
(ii) Give balanced equations for the following reactions: [3]
(a) Dilute nitric acid and copper carbonate.
(b) Silver nitrate solution and sodium chloride solution.
(c) Zinc sulphide and dilute sulphuric acid.
(iii) What happens when (give balanced equation): [4]
(a) Sulphur is added to hot and conc. HNO3 ?
(b) Nitric acid is added to KI (aq) ?
(c) Sodium hydrogen carbonate is added to nitric acid ?
(d) Nitric acid is dissolved in large amount of water ?
QUESTION 8.
(i) State one relevant observation for .the following : [2]
Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.
ICSE 10TH CHEMISTRY SAMPLE PAPER 7 PAGE 8
(ii) How many covalent and coordinate bonds are present in : [2]
(a) Hydronium ion
(b) Ammonium ion.
(iii) You are given the three white powders, calcium carbonate, lead carbonate and zinc carbonate.
Describe the tests you would carry out in solution to identify the metal in each of the above
compounds. Indicate clearly how you would prepare the solutions for the tests. [3]
(iv) Arrange the following as per the instruction given in the brackets. [3]
(a) C, Pb, Sn, Ge, Si (increasing order of non-metallic character).
(b) Na, Al, Cl (increasing order of ionisation potential).
(c) Zn2+, Na+, Cu2+ (order of preference of discharge at the cathode).
*******
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