1. -: JAI GURUDEV CHEMISTRY CLASSES // BY: - AJEET KUMAR // M.N. 7209985022:-
Class XI {Unit-01(Some basic concept of chemistry) + Unit-02 (Atomic structure)} Test No. 01
Unit-01 (Some basic concept of chemistry)
24- marks
1. Write the chemical formula of the following
compounds :- (2.5)
(a) Sodium azide (b) Calcium phosphate
(c) Aluminium nitride (d)ferric sulphate
(e) Ammonium sulphate
2. Find the molar mass of the followings : (2.5)
(a) Glucose (b) sucrose
(c) Ethyl alcohol (d) sulphuric acid
(e)Acetic acid
3. The father of modern chemistry is : - (2)
(a) Priestley (b) Lavoisier
(c) Dalton (d) Mendeleev
4. The number of molecules in 89.6 litre of a
gas at NTP are :- (2)
(a) 6.02 x 1023
(b) 2 x 6.02 x 1023
(c) 3 x 6.02 x 1023
(d) 4 x 6.02 x 1023
5. The largest number of molecules is in :- (2)
(a) 28 g of CO2 (b) 45 g of C2H5OH
(c) 36 g of H2O (d) 54 g of N2O5
6. State the followings:- (2)
(a) Law of conservation of mass
(b) Law of constant proportion
7. Use the data given in the following table to
calculate the molar mass of naturally
occurring carbon :- (2)
Isotope Isotopic molar mass Abundance
36
Ar 35.96755 g /mole 0.337%
38
Ar 37.96272 g/mole 0.063%
40
Ar 39.9624 g/mole 99,6%
8. A compound of carbon, hydrogen and
nitrogen contains these elements in the
ratio 9:1:3.5. Calculate the empirical
formula. If its molecular mass is 108, what is
the molecular formula? (3)
9. Calculate the mass of sodium acetate
(CH3COONa) required making 500 mL of
0.375 molar aqueous solutions. (3)
10. What is the concentration of sugar in mole
per litre if its 20 g are dissolved in enough
water to make a final volume up to 2L? (3)
Unit -02 (Atomic Structure)
24 - marks
11. Write the electronic configuration of the
following:- (2.5)
(a)9F (b)17Cl (c) 35Br (d) 53I (e) 85At
12. Write the electronic configuration of the
following:- (2.5)
(a)24Cr3+
(b)26Fe3+
(c) 29Cu+
(d) 25Mn7+
(e) 47Ag+
13. If uncertainty in the position of an electron
is zero, the uncertainty in its momentum
would be :- (2)
(a) zero (b) < h/ 4
(c) > h/ 4 (d) Infinity
14. A body of mass x is moving with a velocity
of 100 m/s. its de.Broglie wave length is
6.62 x 10-35
m.Hence x is (2)
(a) 0.25 Kg (b) 0.15 Kg (c) 0.2 Kg (d) 0.1 Kg
15. Which of the following sets of quantum
numbers is correct for an electron in 4f-
orbital :- (2)
(a) n =4 , l = 3 , m =+ 4 , s = +1/2
(b) n =4 , l = 4 , m =- 4 , s = - 1/2
(c) n =4 , l = 3 , m =+ 1 , s = +1/2
(d) n = 3 , l = 2 , m =- 2 , s = +1/2
16. State the following (2)
(a) L. de. Broglie Theory
(b) Heisenberg’s uncertainty principle
17. Which of the following represents an
impossible arrangement? (2)
n l m s
a 3 2 -2 ½
b 4 0 0 ½
c 3 2 -2 ½
d 5 3 0 ½
18. State the following
(a) Pauli’s exclusion principle
(b) Aufbau principle
(c) Hund’s rule
19. If the kinetic energy of an electron is
increased 4 times, the wavelength of the
de. Broglie wave associated with it would
become :
(a) 4 times
(b) 2 times
(c) ½ times
(d) ¼ times
20. What is the ratio between the energies of
two radiations one with a wavelength of
6000 and other with 2000 A?