X SA I CHEM TEST FULL SYLLABUS 4

1.           Name  a Non-metal which  is lustrous and  a metal  which  is Non—lustrous.                              

2.           Balance  the  following chemical  equations :                                                                                 

Pb(NO₃)₂ (s)      H  e at      PbO(s) + NO₂ (g) + O₂ (g)

3.           With the help  of a suitable example, explain  0xidation and  Reduction in terms  of gain or loss of oxygen.

4.           Respiration is considered as exothermic reaction.  Explain  why  ?                                              

5.           Name  the  chemicals used  in the  Acid  Fire extinguisher and  the  gas  evolved from  it when  used  ?

6.           Explain  why  Calcium metal  after  reacting with  water  starts  floating  on  its surface  ? Write  the  chemical  equation for the  reaction.

7.           What  are exothermic and  endothermic reaction.  Explain  with  the help  of one example each.

8.           A sanitary worker uses a white  chemical  having strong smell of chlorine gas to disinfect the  water tank.

 (a)     Identify the  chemical  compound. (b)     Write  the  chemical  formula.

(c)     Write  chemical  equation for preparing it.

9.            How  baking  soda  is manufactured ?  Write  chemical  equations.  Write  two  important  uses of it.

10.         (a)     How  copper is obtained from  its ore ?  Write  equations.                                               

(b)    How  impure copper is refined by electrolytic refining ?  Draw  diagram and  write reactions at cathode and  anode.

OR

Write  balanced chemical  equation for the  reactions taking  place  when

(i)      Zinc  carbonate is calcinated.

(ii)     Zinc sulphide is roasted.

(iii)    Zinc oxide  is reduced to Zinc.

(iv)    Cinnabar is heated in the  air.

(v)     Magnese dioxide is heated with  Aluminium Powder.