CLASS XI
Chemistry Paper I
1ST SHIFT
Max. Marks: 30
Time: 40 minutes
1.
Which of the following contains
the largest mass of chlorine ?
A. 10.0 g of Cl2
B. 50.0g of
KClO3
C. 0.10 mol of
NaCl
D. 10.1g of NaCl
Sloution :
122.5 g of KClO3 contain 35.5 g of Chlorine
50g of KClO3 contain 35.5 ÷122.5 x 50
50g of KClO3 contain =14.49 g of Chlorine
2. The percentage of nitrogen in urea (NH2)2CO)
is
A. 23.3%
B. 31.3%
C. 38.0 %
D. 46.7%
Solution :
% of
Nitrogen =28g ÷60 x100
=46.7
3. Experiments with the
cathode ray tube have shown
A. that
all nuclei contain protons
B. that all
forms of matter contain electrons
C. that all positive rays were actually
protons
D. that of alpha particles heavier than proton
Reason:
The cathode ray does not depend upon the material fill in the discharged tube
4. The particle with the smallest mass is the
A. Alpha particle
B. Proton
C. Neutron
D. Beta particle
5. The reason why the atomic mass of chlorine is 35.453 rather than
almost exactly 35 is because
A. Every
chlorine atom contain 17 proton
B. all chlorine atoms have identical
properties
C. there are at
least two naturally occurring isotops of chlorine
D. every chlorine atom has a mass of 35.45
amu
Reason:
35.5 is the average relative atomic mass naturallyally occurring
isotopes of Chlorine
6. The total number of valence electron in the BrO-3
:
A. 25
B. 26
C. 27
D. 24
Solution :
Br =7e x1=7e
O = 6e x3=18e
Charge=1e
Total=7e+18e=1e=26e
7. Of the pairs of element listed, which would form the most ionic
bond?
A. B, N
B. H, Cl
C. K , Cl
D. C ,O
Reason:
Due to High electron
Affinity of halogen and llow ionization of alkali metal
8. The shape of the phosphate (PO4-3) ion
A. Angular
B. Triangular
C. Tetrahedral
D. Square planer
9. London
dispersion forces are also called:
A. Ion dipole forces
B. Dipole-
induced dipole forces
C. Dipole dipole forces
D. Instantaneous dipole induced dipole
forces
10. Which crystal system which has, a≠ b≠ c and a ≠ b ≠ g ≠ 900
A. Monoclinic
B. Triclinic
C. Trigonal
D. Hexagonal
11. The moleclues of which of the following gases have the greater
average molecular speed
at 300K?
A. Argon
B. All have the same average molecules speed at
300K
C. Fluorine
D. Neon
Reason:
According
to KMT of gas at same temperature of different gases have same
Kinetic
energy and kinetic energy depends the velocity of gas molecules and the
mass of gas . Due to this larger the mass
lesser the velocity of gas and smaller the
mass of gas the larger of the velocity
of molecule.
12. At a
temperature of about 4250C ,
H2 (g) + I2(g)
↔ 2HI(g)
the equilibrium mixture contain [H2] =0.10 ,[I2]= 0.10 and [HI]= 0.70. If
suddenly 0.050 mol/dm3 of H2, 0.050 mol/dm3 of I2
0.350 mol/dm3 of HI were added , the result would be that:
A. more HI would from
B. the equilibrium would be shifted to the right
C. More H2 and I2 would from
D. No net Chemical change would occur
Solution:
Initial state the equilibrium constant(Kc) is =(0.70)2 ÷ (0.10x0.10)
=49
Final state the equilibrium constant (Kc) =0.70+0.350)2 ÷ {(0.10+0.05)x(0.10+0.050)}
=49
13 In atomic crystals, which type of bonding is present?
A. Ionic bonding
B. Covalent bonding
C. Metallic
bonding
D. Vander Waal forces
14. A real gas most closely approaches the behavior of an ideal gas
under condition of :
A. High pressure and low temp.
B. Low pressure and high temp.
C. Low pressure and low temp.
D. High pressure and high temp.
15. At normal boiling point of
substance, the vapour pressure of the substance :
A. is equal to 760cm of Hg
B. differs for different substance
C. does not have a definite value vapour pressure
at boiling
D. is equal to 760 torr
16. Which of the
following reaction has tendency to go to completion?
A. H2 (g) + O2(g) ↔ 2H2O(g) K= 1.7x 1027
B. N2 + O2 ↔
2NO K= 5.0 x 10-31
C. 2HF ↔ + F2 + H2 K=
1.0x 10-13
D. 2NOCl ↔
2NO + Cl2 K= 1.7x 10-4
17. Three acids
HX, HY & HZ have the following Ka values
i. Ka of HX = 1 x 10-5
ii. Ka of HY = 2 x 10-5
iii. Ka of
HZ =1 x 10-6
What is the
correct increasing order of acidic strength?
A. HX<
HY<, HZ
B. HZ<
HX< HY
C. HZ<
HY< HX
D. HY<
HX< HZ
18. Which of the
following solutions has the smallest [H3O+]?
A. 0.10M
HCl
B. 0.10M H2SO4
C. 0.10M
HNO3
D. 0.10M NH4Cl
19. The term “Kb
for the ammonia” refers directly to
A. NH3 + H2O ↔ NH+4 + OH-
B. NH3 + H3O+ ↔ NH+4 + H2O
C. NH+4 + H2O ↔ NH3 + H3O+
D. NH+4 + OH- ↔
NH3 + H2O
20. The compositions of different solutions of sugar in water are
below
i) 10g of sugar dissolved in 100g of water = “A”
solution
ii) 20g of
sugar dissolved in 100g of water = “B” solution
iii) 30g of
sugar dissolved in 100g of water = “C” solution
iv)
40g of sugar dissolved in 100g of water
= “D” solution
which solution has highest boiling
point
A. “D”
solution
B. “B” solution
C. “A”
solution
D. “C”
solution
21.If solution A has a density
of 1.1g/mL . What is the
molarity of the solute in this solution?
A. 0.38 M
B.
0.50 M
C. 0.45
M
D. 0.10 M
22. What is osmotic
pressure at 0.0 0C of solution
containing 1.0g/L of sucrose (sugar cane )
A. 0.066 atm
B. 0.11 atm
C. 0.24 atm
D. 0.29 atm
Solution:
ЛV=ST
Where
Л is the
osmotic pressure (atm )
S is
solution constant =0.0821atm.dm3.mol-1K-1
T is
the temperature of solution (K)
V is
the volume of solution which contain one mole of solute dm3/mol
Л=0.082
x 273 ÷ 0.342
=0.066
23. If the 150 mL
of 12.0 M HCl is diluted with water to a total volume of 650mL, the molar
concentration of H3O+ is:
A. 2.77 M
- 12.0 M
- 3.56 M
- 1.80 M
Solution:
M2V2=M1V1
M2=12.0 x150÷650
=2.769
24. A positive
catalyst can:
A. diminish the enthalpy of reaction
B. shift the equilibrium of reaction
C. makes a reaction thermodynamically more feasible
D. diminish the activation of reaction
25.
Experiment No.
|
Initial concentrations
|
Initial Rate of
reaction
Mol/dm3/hr
|
[A]
|
[B]
|
01
|
0.10
|
0.02
|
10
|
02
|
0.10
|
0.03
|
15
|
03
|
0.2
|
0.02
|
20
|
The rate law
derived for the reaction from the above data is
A. Rate law =k
[A][B]
B. Rate law =k
[A]2[B]
C. Rate law =k
[A] 2 [B]1/2
D. Rate law =k
[A]1/2[B]2
Solution:
According to Initial rate method
For A reactant
Rate 2 ÷ Rate1 = (Concentration 2 ÷ Concentration 1)n
20 ÷10 = (0.2 ÷0.1)n
2 =(2) n
Therefore
n =1
order of A is 1st
For B reactant
Rate 2 ÷ Rate1 =
(Concentration 2 ÷ Concentration
1)n
15 ÷10 = (0.3 ÷0.2)n
1.5 =(1.5) n
Therefore
n =1
order of B is also 1st
26. The quantity of heat evolved or absorbed during a
chemical reaction is called __________.
A.
Heat or Reaction
B. Heat of Formation
C. Heat of Combination
D. Lattice Energy
27. When the bond being formed are more than those being
broken in a chemical reaction, then the ∆H will be __________.
A. Positive
B. Negative
C .Zero
D. All of above
28. A voltaic is prepared by two cell between Zn and Cu electrode using ZnSO4 and
CuSO4 and
salt bridge . The
Standard reduction potentials are Zn2+/Zn of 0E=
-0.76v, Cu2+/Cu of 0E= +0.34v
The cell potential (0E)of the cell is :
A. - 1.1
v
B . + 1.1 v
C. - 4.2 v
D. Zero
29. Sulphur has the lowest Oxidation
state in __________.
A.
SO2
B.
H2S
C.
H2SO4
D.
S
30. When we
passed same of electric charge in electrolytic cells of AgNO3 , Cu(NO3)2 and Al(NO3)3 in same time the mass deposited on cathode of
Al(NO3)3 is 9g of
Al. What is mass deposited of Ag in AgNO3
A.
108 g
B. 54
g
C. 36
g
D. 9
g
