1) Which two gases are released on heating lead nitrate? a) NO,O2 b) NO2, O2 c) N2O, O2 d) SO2, O2 2) Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be a) Green b) Red c) Blue d) Brown 3) The colour of zinc metal is a) Silvery b) grey c) White d) Reddish brown 4) Which one of the following will be required to identify the gas evolved when dil. HCl reacts with zinc metal? a) Red litmus solution b) A burning splinter c) Lime water d) Blue litmus solution 5) Which of the following is not a balanced chemical equations? a) b) c) d) 6) Can we store CuSO4 in iron container and why? a) Yes, but only in winter b) No c) Yes, but only in summer d) Yes 7) The odour of SO2 gas is a) Foul smelling b) Odourless c) Sweet smelling d) Pungent 8) Which of the following solution is obtained on reacting zinc metal with NaOH solution a) Na3.2NO3 b) 2NO c) Zn(OH)2 d) Na2ZnO2 9) ZnCO3 undergoes "X" to give ZnO + O2. What is X a) Electrolysis b) Thermal decomposition c) Displacement reactions d) Photo chemical decomposition 10) Which of the following is incorrect method of preventing rusting a) Iron articles should be covered with plastic b) Galvanized iron pipe are used for water supply c) The iron articles should be painted d) The machine parts should be oiled or greased

chemical reactions class 10

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