chemical reactions and equations class 10 mcq :-
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| chemical reactions and equations class 10 mcq |
3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4 H2 (g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(a) (i), (zi) and (iii)
(b) (in) and (iv)
(c) (i), (ii) and (iv)
(d) (ii) and (iv)
2. Why do fire flies glow at night?
(A) It has special kind of protein called luciferin that reacts with oxygen and produce light.
(B) It has fire which constantly produce light
(C) it has magnesium which burns in oxygen
(D) it wings absorbed light during day and emit these light at night.
3. Sodium and chlorine are reacted and as a result, sodium chloride is formed which is also called table salt. What option gives the reactants and products of the reaction
(a) reactants-sodium; products - chlorine
(b) reactants-sodium and table salt; products - chlorine
(c) reactants-tables salt; products - sodium and chlorine
(D) reactants sodium and chlorine ;products sodium chloride
4. A researcher adds barium hydroxide to hydrochloric acid to form a white-colored barium chloride. Which option gives the balanced chemical equation of the reaction?
(a) HCI + Ba(OH)2 BaCl2 + 2HOH -
(b) 2HCl + Ba(OH)2 → BaCl2 + 2HOH
(c) 2HCI + Ba(OH)2 → BaH2 + 2HCI + O2
(d) HCI + 2Ba(OH)→ 2BaCl2 + 2HOH + O2
5. One of the following processes does not involve a chemical reaction, that is:
(a) Melting of candle wax when heated
(b) Burning of candle wax when heated
(c) Digestion of food in your stomach
(d) Ripening of banana
6. Which of the reactions is used in black and white photography?
(a) Combination Reaction
(b) Decomposition Reaction
(c) Displacement reaction
(d) Oxidation reaction
7. What happens when lead nitrate reacts with potassium iodide?
(a) They will not react
(b) Large amount of hydrogen release
(c) Yellow ppt of lead iodide and potassium nitrate will be produced
(d) Evolution of gas will occur
8. Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
9. Process of reduction involves
(a) addition oxygen removal hydrogen
(b) addition hydrogen removal
(c) removal oxygen only
(D)removal of hydrogen only
10. Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solution contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occuBftd.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.
(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (iv), (ii) and (iii)
11. Give the ratio in which hydrogen and oxygen are present in water by volume.
(a) 1:2
(b) 1:1
(c) 2:1
(d) 1:8
12. MnO2 + 4HCI → MnCl2 + 2H2O + Cl2
Identify the substance oxidized in the above. equation.
(a) MnC12
(b) HCI
(c) H2O
(d) MnO2
13. Name the products formed when iron filings are heated with dilutehydrochloric acid
(a) Fe (III) chloride and water
(b) Fe (II) chloride and water
(c) Fe (II) chloride and hydrogen gas
(d) Fe (III) chloride and hydrogen gas
14. When S02 gas is passed through saturated solution of H2S, which of the following reaction occurs?
(a) SO2 + 2H2S → 2H20 + 3S -
(b) SO2 + 2H2S → H20 + 3S
(c)SO2 + H2S→→H₂O + S
(d) SO2 + H2O → SO3 + H2
15. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in placeo of lead nitrate?
(a) Lead sulphate (insoluble)
(b) Lead acetate
(c) Ammonium nitrate
(D) potassium sulphate
16.what type of chemical reactions take place when electricity is passed through water?
(A) displacement reaction
(B) combination reaction
(C) decomposition reaction
(D) double displacement reaction
17. Select the oxidising agent for the following reaction.
H2S+I2 > 2HI+S
(A)I2
(B)H2S
(C)HI
(D)S
Answers of chemical reactions and equations McQ:-
1. C
2.A
3.D
4.B
5.A
6.B
7.C
8.A
9.B
10.C
11.C
12.B
13.C
14.A
15.B
16.C
17.A
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