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) Heisenbergs uncertainty principle 17. Which of the following represents an impossible arrangement? (2) n l m s a 3 2 -2 b 4 0 0 c 3 2 -2 d 5 3 0 18. State the following (a) Paulis exclusion principle (b) Aufbau principle (c) Hunds 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) times (d) times 20. What is the ratio between the energies of two radiations one with a wavelength of 6000 and other with 2000 A?