CBSE ADDA

X Class 10 Chemical reaction and Equation chapter wise MCQ Section – A (1 mark) 1.  4NH 3 (g) + 5O 2 (g) → 4NO(g) + 6H2O(g) is an example of  (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction (a) (i) and (iv)             (b) (ii) and (iii)              (c) (i) and (iii)             (d) (iii) and (iv) 2. Which of the following statements are correct?  3Fe(s) + 4H 2 O(g) → Fe 3 O 4 (s) + 4H 2 (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), (ii) and (iii)        (b) (iii) and (iv)            (c) (i), (ii) and (iv)        (d) (ii) and (iv) 3. 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 (a) (i) and (ii)    

  1. Which of the following statements about the given reaction are correct? 3Fe (s)  + 4H 2 O (g)  => Fe 3 O 4(s)  + 4H 2(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), (ii) and (iii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (ii) and (iv)   2.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 place of lead nitrate?  (a) Lead sulphate  (b) Lead acetate  (c) Potassium sulphate 3. A solution of X is used for white washing walls. it reacts slowly with Y in air to form a thin layer of B on walls which gives walls a shiny finish. which of the following options correctly represents X,Y and B ?   a) X =slaked lime , Y = nitrogen , B=calcium oxide b

X Class 10 NCERT Activity Explanation Class 10 Metals and Non Metals Activity 3.1 Page No. 37 Take samples of iron, copper, aluminium and magnesium. Note the appearance of each sample. They have a shining surface. Clean the surface of each sample by rubbing them with sand paper and note their appearance again. They become more shiny. => Freshly cut Metal have shiny surface Activity 3.2 Page No. 37 Take small pieces of iron, copper, aluminium, and magnesium. Try to cut these metals with a sharp knife and note your observations. They are very hard to cut. Hold a piece of sodium metal with a pair of tongs and try to cut it with a knife. Sodium can be cut easily with knife. Hence K and Na are soft metal cut with knife Activity 3.3 Page No. 38 Take pieces of iron, zinc, lead and copper try to strike it four or five times with a hammer. These metals are beaten into thin sheet on hammering. This property of metal is called malleability and metals are called malleable. Activity 3.4 Page