Chemistry Mcqs Set 59

Chemistry Mcqs Set 59

1. A lustrous white silver plate , is exposed to the atmosphere for several days. Which of the following statement is incorrect?
(i) The silver plate gets tarnished 
(ii) A black coating is formed due to the formation of silver sulphide
(iii) The silver plate is unaffected               
(iv) The shape of the silver plate is altered
 
2. To an aqueous solution of lead nitrate , in a beaker, an aqueous solution of potassium iodide is added. Choose the correct statements .................
1. a yellow precipitate of lead iodide is formed
2. this is an example of double decomposition reaction
3. the resultant mixture is a colourless solution
4. this is an displacement reaction
(i) 1 and 2                  
(ii) 3 and 4                      
(iii) 1 and 3                    
(iv) 2 and 3
 
3. To a pinch of powdered calcium carbonate in a test tube, a few drops of dilute hydrochloric acid is added which of the following statement is correct ..............
1. chlorine gas is liberated
2. calcium carbonate and hydrochloric acid are the reactants
3. calcium chloride carbondioxide and H2O are the products
4. no change is observed
(i) 1 and 2                       
(ii) 3 and 4                               
(iii) 1 and 3                            
(iv) 2 and 3
 
4. Which of the following is a decomposition reaction?
(i) heating ammonium-di-chromate at high temperature,
(ii) mixing copper sulphate solution and barium chloride solution,
(iii) placing zinc rod into a solution of copper sulphate
(iv) adding water to quick lime
 
5. Choose the combination reaction ............
(i) extraction of a metal                                         
(ii) burning of metals
(iii) addition of a more active metal to a solution of less active metal compound
(iv) electrolysis
 
6. Identify the double decomposition reaction ....................
(i) hydrogen burns in air                                             
(ii) electrolysis of water
(iii) digestion of food in our body    
(iv) addition of dilute sulphuric acid to barium chloride solution
 
7. Fe2O3 + 2Al Al2O3 + 2Fe2. This reaction is an example of .................
(i) combination reaction                      
(ii) double displacement reaction 
(iii) decomposition reaction                
(iv) displacement reaction
 
8. Which of the following is redox reaction?
(i) ZnO + C --> Zn + CO                              
(ii) AgNO3 + NaCl --> AgCl+ NaNO3
(iii) FeCl3 + 3NH4OH --> Fe(OH)3 + 3NH4Cl                    
(iv) 2Ag Br -->2Ag + Br2
 
9. Choose the exothermic reaction from the following ..............
(i) a detergent is dissolved in water                       
(ii) glucose is kept on our tongue
(iii) ammonium chloride is dissolved in water                      
(iv) all the above
 
10. In a redox reaction ...............
(i) an oxidising agent gets reduced                      
(ii) a reducing agent gets oxidized
(iii) both oxidation and reduction occur together                   
(iv) all the above