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Worksheet for Class 10 Chemistry Chapter 1 Chemical Reactions and Equations
Class 10 Chemistry students should refer to the following printable worksheet in Pdf for Chapter 1 Chemical Reactions and Equations in standard 10. This test paper with questions and answers for Grade 10 Chemistry will be very useful for exams and help you to score good marks
Class 10 Chemistry Worksheet for Chapter 1 Chemical Reactions and Equations
Question. In the balanced equation -
aHgS+bHCl + cHNO3 → dH2HgCl4 + eNO + fS + gH2O
The values of b, c, e, and g are respectively -
(A) 2, 2, 4, 12
(B) 6, 1, 1, 2
(C) 12,2, 2, 4
(D) both (B) and (C)
Question. In the reaction FeSO4 + x → Na2SO4 + Fe(OH)2 , x is -
(D) none of these
Question. In the reaction the possible state of Ca(OH)2 is -
Question. The rate of reaction remains same, when -
(A) temperature of the reaction changes.
(C) both (A) and (B) are correct
(B) catalyst is added to reaction mixture.
(D) none of these is correct
Question. aK2Cr2O7 + bKCl + cH2SO4 → xCrO2Cl2 + y KHSO4 + zH2O
The above equation balances when
(A) a = 2, b = 4, c = 6 and x = 2, y = 6 , z = 3
(B) a = 4, b = 2, c = 6 and x = 6, y = 2, z = 3
(C) a = 6, b = 4, c = 6 and x = 6, y = 3, z = 2
(D) a = 1, b = 4, c = 6 and x = 2, y = 6, z = 3
Question. In the reaction Mg + Cl2 → MgCl2
Chlorine may be regarded as -
(A) an oxidising agent
(C) a catalyst
(B) a reducing agent
(D) providing an inert medium
Question. The antioxidant which is used to prevent rancidity in foods is
(A) butylated hydroxyl anisole.
(B) sodium hydroxide.
(C) sodium carbonate.
(D) methylated hydroxyl anisole
Question. The colour of the chemical that changes when it is left open in sunlight is -
(A) FeSO4 (s).
(B) Pb(NO3)2 (s)
(C) AgCl (s).
(D) BaCl2 (aq)
Question. Sun produces heat and light by -
(C) nuclear reactions.
(D) photochemical reactions.
Question. Heating of calcium carbonate to give calcium oxide and carbon dioxide is -
(A) An oxidation process
(B) A reduction process
Question. Which of the following statement(s) is/are correct ?
(A) Many compounds can be used as oxidizing as well as reducing agent .
(B) We need equal moles and equal volumes of strong monobasic acid and strong monoacidic base to completely neutralize themselves.
(C) The quantity of a catalyst does not change at the end of a chemical reaction .
(D) All of these are correct
Question. The elements undergoing reduction and oxidation during the reaction,
(NH4)2Cr2O7 → N2 + Cr2O3 + 4H2O are respectively
(A) N and Cr
(B) Cr and N
(C) N and O
(D) Cr and O
Question. The decomposition of KCIO3 to KCI and O2 on heating is an example of:
(A) Intermolecular redox change
(B) Intramolecular redox change
(C) Disproportionation or auto redox change
(D) None of the above
Question. Which of the following can act as oxidant ?
(D) None of these
Question. Conversion of PbSO4 to PbS is -
(A) reduction of S
(B) oxidation of S
(D) none of these
Question. Which of the following is redox reaction ?
(A) NaOH + HCl → NaCl + H2O
(B) AgNO3 + KI → AgI + KNO3
(C) BaO2 + H2SO4 → BaSO4 + H2O2
(D) SnCI2 + HgCI2 → SnCI4 + Hg
Question. In a conjugate pair of reductant and oxidant, the reductant has :
(A) Lower ox. no.
(B) Higher ox. no.
(C) Same ox. no.
(D) Either of these
Question. Oxidation is process which involves:
(C) Addition of hydrogen
(D) Addition of metal
Question. Oxidants are substances which :
(A) Show a decrease in their oxidation number during a change
(B) Gain electrons during a change
(C) Oxidise others and reduce themselves
(D) All of the above
Question. If an iron rod is dipped in CuSO4 solution :
(A) Blue colour if the solution turns red
(B) Brown layer is deposited on iron rod
(C) No change occurs in the colour of the solution
(D) None of the above
Question. Which of the following is a redox reaction ?
(A) CaCO3 → CaO + CO2
(B) H2 + Cl2 → 2HCl
(C) CaO + 2HCl → CaCl2 + H2O
(D) NaOH + HCl → NaCl + H2O
Question. Which of the following statement about the following reaction is correct
ZnO + CO → Zn + CO2
(A) ZnO is being oxidised
(B) CO is being reduced
(C) CO2 is being oxidised
(D) ZnO is being reduced
Question. Calorific value of a fuel may be defined as -
(A) The amount of heat produced when 1000 kg of a fuel is completely burnt.
(B) The amount of heat produced when 1 g of fuel is incompletely burnt.
(C) The amount of heat produced when 10 g of a fuel is completely burnt.
(D) The amount of heat produced in kilojoules when unit mass of a fuel is completely burnt.
Question. Which of the following fuels has the highest calorific value ?
(D) Natural gas
Question. In which zone of a candle flame does complete combustion take place ?
(D) All three zones
Question. The zone of no combustion is -
(A) the middle zone
(B) outermost zone
(C) the base of the flame
(D) innermost zone.
Question. The colour of the flame in luminous zone is -
Question. The non-combustible substance among the following is -
Question. Combustion is a -
(A) physical process
(B) chemical process
(C) biological process
(D) mechanical process
Question. A circular blackish ring on the glass plate kept over the candle flame indicates-
(A) complete combustion.
(B) dark zone of the flame.
(C) non-luminous zone.
(D) luminous zone
Question. Combustion is a process involving -
(C) liberation of heat
(D) all(A),(B) & (C)
CASE STUDY BASED QUESTIONS:
Question. Read the following and answer the questions :
A student was asked to investigate what happens when a piece of shiny magnesium ribbon is added to copper sulphate solution. The apparatus was set up as shown below. The mass was recorded at the start and again after one hour.
Question. Complete the equation:
Mg + CuSO4 →--------- + ---------
(a) MgSO4 + Cu
(c) MgS + Cu2O
(b) MgO + Cu
(d) Mg SO3 + Cu2O
Question. Choose from below the name given to this type of reaction:
Question. Balance the following symbol equation that represents the displacement reaction that takes place between zinc and silver nitrate solution.
Zn + AgNO3 → Zn(NO3)2 + Ag
(a) Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
(b) Zn + 3AgNO3 → Zn(NO3)2 + 3Ag
(c) Zn + 2AgNO3 → Zn(NO3)2 + Ag
(d) 2 Zn + AgNO3 → Zn(NO3)2 + Ag
Question. The experiment was repeated using sodium sulphate solution instead of copper sulphate solution.
No reaction took place. Put the metals copper, magnesium and sodium in order of reactivity.
(a) I. Sodium II Copper III Magnesium
(b) I Magnesium II Copper III Sodium
(c) I. Copper II. Magnesium III. Sodium
(d) I. Sodium II. Magnesium III. Copper
Question. What will be the mass of the beaker and content after 1 hour?
(a.) More than 80.6 g
(b) Equal to 80.6 g
(c) Less than 80.6 g
(d) None of the above
Read the following and answer the questions :
Called the reducing agent; when the reaction occurs, it reduces the other species. In other words, what is oxidized is the reducing agent and what is reduced is the oxidizing agent.
A good example of a redox reaction is the thermite reaction, in which iron atoms in ferric oxide
lose (or give up) O atoms to Al atoms, producing Al2O3.
Fe2O3 (s) +2Al (s)→Al2O3 (s)+2Fe (l)
Redox reactions can occur relatively slowly, as in the formation of rust, or much morerapidly, as in the case of burning fuel. There are simple redox processes, such as theoxidation
Question. Which of the following is correct code for X and Y in the following reaction ?
(i) x=oxidation reaction, y=reduction reaction
(ii) x=gain of two electrons, y=loss of two electrons,
(iii) x=reduction reaction, y=oxidation reaction
(iv) x=loss of two electrons, y=gain of two electrons
(a) (i) and (ii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (iii) and (iv)
Question. A substance which oxidizes itself and reduces other is known as:
(a) Oxidizing agent
(b) Reducing agent
(c) Both of these
(d) None of these
Question. ‘Thermite is a pyrotechnic composition of metal powder, which serves as fuel, and metal oxide.
When ignited by heat, thermite undergoes a reaction between iron and Aluminum Oxide and is used in the wielding of railway tracks. The type of reaction is called:
Question. “Redox reactions can occur relatively slowly, as in the formation of rust, or much more rapidly, as in the case of burning fuel” Rusting and combustion are quite different. Which of the following lines is not the correct explanation for this?
(a) Rusting occurs at the surface of iron to form a layer of rust.
(b) Rusting gives out lots of heat and light.
(c) Rusting is an example of slow oxidation.
(d) It can be hampered by applying paint.
Question. Reduction can be defined as:
(a) Gain of electrons
(b) Gain of Oxygen
(c) Loss of Hydrogen
(d) Loss of electrons
Read the following and answer the questions :
Oxidation is the process of gaining of oxygen, or losing of hydrogen. Reduction is the process of losing of oxygen or gaining of hydrogen. The substance which undergoes oxidation is the reducing agent while the substance which undergoes reduction is known as the oxidising agent. Oxidation and reduction always take place together and these types of reactions are known as redox reactions. Some of the examples of redox reactions are given below:
Question. Give two examples of oxidation reaction from your everyday life.
Answer. corrosion & rancidity
Question. Write the oxidising agent in the reaction III and VI.
Answer. CuSO4 in (III) & CuO in(VI)
Question. Which of the following is an oxidising agent?
(b) Alkaline KMnO4
(c) Acidified K2Cr2O7
(d) Both (b) and (c)
Question. Out of oxidation and reduction, which reaction takes place at anode?
Question. Which substance undergoes reduction?
Answer. oxidizing agent
Read the following and answer the questions :
A chemical reaction is a representation of chemical change in terms of symbols and formulae of reactants and products. There are various types of chemical reactions like combination,
decomposition, displacement, double displacement, oxidation and reduction reactions. Reactions in which heat is released along with the formation of products are called exothermic chemical reactions. All combustion reactions are exothermic reactions.
Question. The chemical reaction in which a single substance breaks down into two or more simpler substances upon heating is known as
(a) thermal decomposition reaction
(b) photo decomposition reaction
(c) electric decomposition reaction
(d) both (a) and (c)
Question. The massive force that pushes the rocket forward through space is generated due to the
(a) combination reaction
(b) decomposition reaction
(c) displacement reaction
(d) double displacement reaction
Question. A white salt on heating decomposes to give brown fumes and yellow residue is left behind. The yellow residue left is of
(a) lead nitrate
(b) nitrogen oxide
(c) lead oxide
(d) oxygen gas
Question. Which of the following reactions represents a combination reaction?
(a) CaO (s) + H2O (l) → Ca(OH)2 (aq)
(b) CaCO3 (s) → CaO (s) + CO2(g)
(c) Zn(s) + CuSO4 (aq) → ZnSO4 (aq) + Cu(s)
(d) 2FeSO4(s) → Fe2O3 (s) +SO2(g) + SO3(g)
Question. Complete the following statements by choosing correct type of reaction for X and Y.
Statement 1: The heating of lead nitrate is an example of ‘X’ reaction.
Statement 2: The burning of magnesium is an example of ‘Y’ reaction.
(a) X- Combination, Y- Decomposition
(b) X- Decomposition, Y-Combination
(c) X- Combination, Y-Displacement
(d) X- Displacement, Y-Decomposition
Read the following and answer the questions :
Chemical equation is a method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it. In a chemical equation, the substances which combine or react are called reactants and new substances produced are called products. A chemical equation is a short hand method of representing a chemical reaction. A balanced chemical equation has equal number of atoms of different elements in the reactants and products side. An unbalanced chemical equation has unequal number of atoms of one or more elements in reactants and products. Formulae of elements and compounds are not changed to balance an equation.
Question.Consider the following reaction:
pMg3N2 + qH2O ⇾ rMg(OH)2 + sNH3
When the equation is balanced, the coefficients p, q, r, s respectively is
(d) 2,3,6, 2
Question. Which of the following information is not conveyed by a balanced chemical equation?
(a) Physical states of reactants and products
(b) Symbols and formulae of all the substances involved in a particular reaction
(c) Number of atoms/molecules of the reactants and products formed
(d) Whether a particular reaction is actually feasible or not
Question. The balancing of chemical equations is in accordance with
(a) Law of combining volumes
(b) Law of constant proportions
(c) Law of conservation of mass
(d) Both (b) and (c)
Question. Which of the following chemical equations is an unbalanced one?
(a) 2NaHCO3 ⟶ Na2CO3+H2O+CO2
(b) 2C4H10+12O2 ⟶ 8CO2+10H2O
(c) 2Al+6H2O ⟶ 2Al(OH)3+3H2
(d) 4NH3+5O2 ⟶ 4NO+6H2O
Question. Which of the following statements is/are correct?
(a) A chemical equation tells us about the substances involved in a reaction.
(b) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
(c) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
(d) All the above.
Question : Balance the following chemical equation and identify the reactants and products.
a. _____ Zn (s) + _____ AgNO3 (aq) → _____ Zn(NO3)2 (aq) + _____ Ag (s)
b. _____ N2 (g) + _____ H2 (g) → _____ NH3 (g)
c. _____ Mg(OH)2 (aq) + _____ H3PO4 (aq) → _____ H2O (l) + _____ Mg3(PO4)2(aq)
d. _____ HNO3 (aq) + _____ Ni (s) → _____ Ni(NO3)2 (aq) + _____ H2 (g)
e. _____ Ba(HCO3)2 (s) → _____ BaCO3 (s) + _____ H2O (g) + _____ CO2 (g)
f. _____ BaCl2 (aq) + _____ Na2SO4 (aq) → _____ NaCl (aq) + _____ BaSO4 (s)
g. _____ Al2(CO3)3 (s) → _____ Al2O3 (s) + _____ CO2 (g)
h. _____ Ca (s) + _____ H2O (l) → _____ Ca(OH)2 (aq) + _____ H2 (g)
i. _____ LiHCO3 (s) → _____ Li2CO3 (s) + _____ H2O (g) + _____ CO2 (g)
j. _____ N2 (g) + _____ O2 (g) → _____ N2O5 (g)
k. _____ MgBr2 (aq) + _____ KOH (aq) → _____ KBr (aq) + _____ Mg(OH)2 (s)
l. _____ Mn (s) + _____ CuCl (aq) → _____ Cu (s) + _____ MnCl2 (s)
m. _____ Zn (s) + _____ S8 (s) → _____ ZnS (s)
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