Chemistry Important Questions Class 11

Chemistry Important Questions Class 11

Multiple choice questions

1.
Volume of
75% H2SO4 by weight (density=1.8 g/ml) required to
prepare 1L of 0.5 M solution is

       (a) 36 ml                                                               (b)3.6 ml


(c) 39 ml
(d) 33 ml

 

2.
A certain
a buffer solution contains equal concentrations of X and HX. If Kb
for X is !0-10,calculate pH of
the buffer.

(a) 4                                                                              (b)
10

(c)
7                                                                              (d) 14

 

3.
Reagents
required for conversion of benzene to hexachlorobenzene
are

(a) excess Cl2
, AlCl3
                                                   (b) sunlight , excess Cl2

(c)
excess Cl2, ZnCl2                                                     (d) sunlight, CaCl2

 

4. The compressibility factor for a real gas at
high pressure is 

       (a) 1+RT/pb
(b) 1

       (c) 1+ pb/RT
(d) 1- pb/RT     

 

5.   Two electrolytic cells containing CuSO4
and AgNO3 are connected in series. The current of 2 A was 

      passed till 10.8 g of Ag got deposited. (At.wt.
of Cu = 63,Ag = 108). The amount of Cu deposited in

      the same time will be

(a)
6.3 g
     (b) 1.575 g

(c)
10.8 g                                                                 (d) 3.15
g

 




NCERT Biology Class 11 Solutions

6.  In a Lechlanche cell which of the following takes place:

(a)
Reduction
of Zn2+ to Zn           (b)
Reduction of Mn4+ to Mn3+

(c)  Reduction of Mn4+ to Mn2+      (d) Oxidation of Mn3+ to Mn4+

 

7. Standard heat of formation of CH4, CO2, and H2O(g) is
-76.2 , -394.8 and -241.6 kJ/mol

    respectively. The amount of heat evolved on burning 1 m3 of
CH4 measured  at
STP is


(a) 801 kJ
(b) 36 kJ

       (c) 36000 kJ                                              (d) 954 kJ      

 

8. Which of the following is NOT true
about glucose:

       (a) Reduces Fehling’s solution            (b) Gives Schiff’s test 

       (c)
Has an aldehyde group
                 (d) Reduces Tollen’s
reagent

 

9. The order of intermolecular forces in the
following polymers is

       (a) Nylon 6,6
< PVC < Polyethylene
         (b) Nylon 6,6 < Polyethylene <
PVC


(c)  PVC < Polyethylene < Nylon
6,6
(d)  Polyethylene < PVC < Nylon
6,6

 

10. The rate of a reaction doubles when
temperature changes from 27oC to 37oC. The
activation 

       energy is

       (a) 53.6 kJ mol-1                                (b) 57.6 x 10 J mol-1

       (c) 53600 kJ mol-1                             (d) 123.4 kJ mol-1     

 

11. Hall-Heroult
the process is used for the extraction of   


(a) Ni
(b) Al


(c) Fe
(d) Cu      

 

12. The equilibrium mixture for

                    2 SO2(g) +
O2 (g)
à 2SO3(g)

       present in the 1-liter vessel at 600oC
contains 0.50, 0.12 and 5.0 mole of SO2, O2, and SO3
 

       respectively. The Kp for the reaction is


(a) 22000 atm-1                                            (b)
833 atm -1

         (c) 11.6 atm
-1
                                                                          (d)
0.114 atm-1




Class 11 Chemistry NCERT Book Pdf Download

13. As per IUPAC nomenclature
,the
complex [Co(NH3)2(H2O)4]Cl3


(a) Tetraaquadiaminecobalt(III)chloride
(b) Tetraaquadiamminecobalt(III)chloride     


(c) Diaminetetraaquacobalt(III)chloride
(d) Diamminetetraaquacobalt(III)chloride        

 

14. The solubility product (Ksp)
of CuS,
Ag2S and HgS are 10-31,10-44
and 10-54 respectively. The order

      of their solubility in water is


(a) CuS<Ag2S<HgS                                     (b) Ag2S
<HgS<CuS

       (c) HgS< CuS<Ag2S
                                   (d) CuS< HgS <Ag2S

 

15. Which of these salts can be converted into alkyne by Kolbe’s method?


(a) Sodium succinate                                     (b) Sodium maleate


(c) Sodium formate                                        (d)
Sodium acetate

Numerical
answer questions

 16. If
the plot of Rate vs Concentration  of reactants is a line parallel to
the x-axis, the order of the 

      reaction is    0

     

 17. Vant Hoff’s factor for Na2SO4 in very
dilute solution is   3

      

 18. The covalency of Nitrogen in N2O5 is     4

 

 19. A 37%
(w/w) HCl stock solution has a density of 1.18 g/ml.
The molecular weight of HCl is 36.5

  g/mol. The volume of
the stock solution required to prepare 100 ml solution of 6M HCl
is      50

     

NCERT Class 11 Physics

 20. The
total number of lone pair of electrons in melamine is  6

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