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                                                Class 10 Science Chapter 2       EXERCISE SOLUTION Q 1- A solution turns red litmus blue, its pH is likely to be (a) 1           (b) 4           (c) 5           (d) 10 Answer: (d) 10 EXPLANATION- BECAUSE LITMUS PAPER TURNS BLUE WHEN pH MORE THAN 7. Q 2- A solution reacts with crushed-egg shells to give a gas that turns lime water milky. The solution contains-- (a) NaCl           (b) HCl           (c) LiCl           (d) KCl Answer: (b) HCl EXPLANATION - egg shells contains calcium carbonate which on reaction with HCl liberates carbon di-oxide gas which turn lime water milky. Q 3- 10 ml of a solution of NaOH is found to be complete...

                                  Solutions for Class 10th Science Chapter -1                Chemical Reactions and Equations Q 1.Which of the given statements about the reaction below are incorrect? a. Lead is getting reduced b. Carbon dioxide is getting oxidised c. Carbon is getting oxidised d. Lead oxide is getting reduced (i) (a) and (b) (ii) (a) and (c) (iii) (a), (b) and (c) (iv) all Ans- (i) (a) and (b) Explanation- (a) Because Oxygen is being removed.                      (b) Because the removed oxygen from lead is added to the carbon. Q2. The above reaction is an example of a (i). Combination reaction (ii). Double displacement reaction (iii). Decomposition reaction (iv). Displacement reaction Ans -(iv) Displacement reaction Explanation- The Oxygen from the Ferrous Oxide is getting displaced form Alumi...