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 K_b
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
         (b) Nylon 6,6 PVC

(c)  PVC 6,6
(d)  Polyethylene 6,6

 

10. The rate of a reaction doubles when
temperature changes from 27^oC to 37^oC. 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 600^oC
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

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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) CuS2SHgS                                     (b) Ag₂S
HgSCuS

       (c) HgSCuS2S
                                   (d) CuSHgS 2S

 

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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