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Rank Enhancement Programme for NEET-19
CHEMISTRY ASSIGNMENT-22
Topics Covered
Chemistry : Some Basic Concepts of Chemistry, Structure of atom
Choose the correct Answer :
1. The numerical prefix ‘femto’ have value equals to 7. 5 g of hydrocarbon on combustion with 15.5 g of
oxygen produce 12.2 g of CO2 and 8.3 g of H2O.
(1) 10–12 (2) 10–15
The data illustrate the law of
(3) 10–9 (4) 10–20
(1) Multiple proportions
2. The normal boiling point of water is
(2) Constant proportions
(1) 100°F (2) 373°F
(3) Conservation of mass
(3) 212°F (4) 180°F
(4) Reciprocal proportions
3. One microgram is equal to
8. Which of the following alkane has 75% of carbon?
(1) 10–3 g (2) 103 g
(1) CH4 (2) C2H6
(3) 106 g (4) 10–6 g
(3) C3H8 (4) C5H12
4. Which of the following is a chemical change?
9. If 1 ‘grain’ is equal to 64.8 mg. How many moles
(1) Sublimation of paracetamol (mol. wt = 151) are present in 6
(2) Melting of ice grain paracetamol tablet?
(3) Rusting of iron (1) 1.255 × 10–3 (2) 2.575 × 10–3
(4) Boiling of water (3) 5.525 × 10–3 (4) 6.55 × 10–3
5. In the number 4.5687, there are 5 significant digits, 10. The number of moles of oxygen in 2.24 m 3 of
which one is the uncertain digit? volume at STP is (1 m3 = 1000 L)
(1) 5 (2) 4 (1) 0.1 (2) 0.01
(3) 8 (4) 7 (3) 10 (4) 100
6. If 1 ml of water contains 30 drops, then number of 11. How many moles of K+ ions are in 30 ml of 0.2 M
molecules in a drop of water is K3PO4?
(1) 6.023 × 1023 (2) 1.115 × 1021 (1) 0.06 (2) 0.006
(3) 3.345 × 1022 (4) 4.325 × 1020 (3) 0.012 (4) 0.018
(1)
Rank Enhancement Programme for NEET-19 Chemistry Assignment-22
12. A quantity of sodium has a mass 69 g. What is 20. A compound of calcium and chlorine composed of 20
the mass of same number of calcium atoms? g calcium for every 35.5 g of chlorine. The empirical
formula of the compound is
(1) 40 g (2) 60 g
(1) CaCl (2) Ca2Cl
(3) 80 g (4) 120 g
(3) CaCl2 (4) Ca2Cl3
14
13. 1 mole of 7 N3 ions contains
21. Assuming 100% ionisation, the solution having
(1) 10 × 6.023 × 1023 electrons highest normality is
(2) 7 × 6.023 × 1023 neutrons (1) 1 M HNO3 (2) 1 M H2SO4
(3) 7 × 6.023 × 1023 protons (3) 1 M H3PO3 (4) 1 M H3PO4
(4) All of these 22. The number of moles of water in 610 g BaCl2.2H2O
is (At. wt. Ba = 137)
14. 15 ml of 0.5 M HCl is mixed with 30 ml of 0.3 M
HCl. The molarity of resulting solution is (1) 2 (2) 4
(1) 0.45 M (2) 0.36 M (3) 5 (4) 10
(3) 0.90 M (4) 0.18 M 23. The number of g atom of oxygen in 6.023 × 1024
molecules of CO is
15. The concentration term which is independent of
temperature? (1) 2 (2) 5
(1) Molarity (3) 10 (4) 15
(2) Molality 24. Significant figures in 0.0062 are
(3) Normality (1) 4 (2) 3
(4) w / v% (3) 2 (4) 5
16. Density of 1.5 M solution of phosphoric acid in 25. Sulphur trioxide may be prepared by the following
water is 1.15 gml–1. The molality of solution is two reactions
(1) 2.99 m (2) 1.495 m S8 + 8O2(g) 8SO2(g)
(3) 4.486 m (4) 3.339 m 2SO2(g) + O2(g) 2SO3(g)
17. A solution is prepared by mixing 50 g sugar How many moles of SO3 will be produced from
(C12H22O11) in 100 g water. The mole fraction of 1 mole of S8?
sugar is
(1) 1 (2) 2
(1) 0.50 (2) 0.33
(3) 4 (4) 8
(3) 0.025 (4) 0.66
26. The wave number ( ) of the radiations which have
18. The mole fraction of water in 20% (w/w) aqueous
a frequency of 3 × 1012 hertz is
solution of H2O2 is
(1) 103 cm–1 (2) 2 × 104 cm–1
20 68 (3) 102 cm–1 (4) 3 × 103 cm–1
(1) (2)
80 77
27. The radius of 2nd orbit in Be3+ ion is
77 80 (1) 0.529 Å (2) 1.058 Å
(3) (4)
68 20 (3) 1.587 Å (4) 1.769 Å
19. A compound contains 10–3% of sulphur. If atomic 28. The wavelength of a proton which is moving with a
mass of sulphur is 32, the molar mass of the K.E of 5 × 10–27J is
compound having one sulphur atom per molecule is (Mass of proton = 1.66 × 10–27 kg)
(1) 32 × 103 (2) 32 × 104 (1) 3.45 × 10–9 m (2) 7.94 × 10–8 m
(3) 32 × 105 (4) 32 × 102 (3) 1.25 × 10–11 m (4) 1.62 × 10–7 m
(2)
Chemistry Assignment-22 Rank Enhancement Programme for NEET-19
29. The nodal plane in a 2py orbital is in the 37. A sample of hydrogen gas absorbs a photon of
(1) yz-plane (2) xz-plane wavelength 355 nm and emits energy of two
wavelengths; one of 680 nm and the other of x nm.
(3) xy-plane (4) Both (1) & (2) ‘x’ is
30. The ratio of unpaired electrons present in Fe3+ and (1) 305 nm (2) 743 nm
Cr3+ ions is (Atomic number of Fe and Cr is 26 and
24 respectively) (3) 1125 nm (4) 1505 nm
3 2 38. The correct set of quantum numbers for the last
(1) (2) electron of Tellurium atom is (At. No. of Te = 52)
5 5
5 1 1
(3) (4) 3 (1) 4, 3, 0, (2) 5, 1, 0,
3 2 2
31. The atomic number of an element with valence 1 1
shell configuration of 5s2, 5p4 will be (3) 5, 0, 0, (4) 4, 1, –1,
2 2
(1) 33 (2) 53
39. In an element having atomic number 105, the
(3) 84 (4) 52 number of electrons in its atom which have (n + l)
32. Which of the following phenomena shows particle = 8 are
nature of electron? (1) 18 (2) 20
(1) Photoelectric effect (3) 22 (4) 17
(2) Interference 40. The correct statement out of the following is
(3) Black body radiation e
(1) ratio of cathode rays is constant
(4) Both (1) & (3) m
33. Which of the following orbitals are not degenerate? e
(2) ratio of anode rays is not constant
(1) 4dyz and 3dxz m
(2) 3dz2 and 4pz e
(3) ratio of protons is not constant
(3) Both are degenerate m
(4) Both (1) & (2) are correct
(4) Both (1) & (2) are non-degenerate
41. The number of electrons in an atom with m = 0 and
34. In Paschen series of hydrogen spectrum, which
electronic transition produces second line? 1
s if in its K, L, M, N shells there are 2, 8,
(1) 4 2 (2) 5 3 2
11 and 2 electrons respectively, are
(3) 4 3 (4) 6 3
(1) 10 (2) 12
35. The ratio of number of radial and angular nodes in
4d orbital is (3) 7 (4) 15
42. The kinetic energy of photoelectrons in
1 2 photoelectric effect is directly proportional to
(1) (2)
3 3
(1) Wavelength of incident radiation
3 1 (2) Frequency of incident radiation
(3) (4)
5 2 (3) Wave number of incident radiation
36. The number of electrons present in d-subshell of (4) Both (2) & (3)
Mn2+ ion is equal to the number of
43. The pair of transitions in hydrogen spectrum for
(Atomic number of Mn = 25) which the ratio of wave number is 108 : 7 is
(1) d-electrons in Fe3+ ion (Atomic number = 26) (1) 2 to 1 and 5 to 4
(2) p-electrons in Ar (Atomic number = 18) (2) 2 to 1 and 4 to 1
(3) d-electrons in Zr (Atomic number = 40) (3) 2 to 1 and 4 to 3
(4) Both (2) & (3) are correct (4) 2 to 1 and 3 to 1
(3)
Rank Enhancement Programme for NEET-19 Chemistry Assignment-22
44. Number of waves made by an electron in one 47. Two types of electronic configurations are given as
complete revolution in its 5th orbit is A : 1s2, 2s2, 2p6, 3s2
(1) 4 (2) 5 B : 1s2, 2s2, 2p6, 4s2
(3) 9 (4) 1 Considering the given configurations choose the
correct statement/s.
45. The ratio of energy of electron in ground state of (1) A and B, both represent ions
hydrogen atom to the electron in second excited
state of Li2+ ion is (2) To change A to B, energy is required
(3) A can be an ion but B represents an atom
(1) 1 : 9
(4) Both (1) & (3)
(2) 1 : 12 48. The number of unpaired electrons present in Co3+
(3) 12 : 1 is/are (At. no. = 27)
(1) 2 (2) 3
(4) 1
(3) 4 (4) 5
46. The correct statement/s about an electron having 49. The quantum number which was not obtained from
n = 4 and m = –2 is/are Schrodinger wave equation is
(1) The electron is present in a d-subshell (1) m (2) n
(2) The electron may belong to Na (3) s (4) l
50. If an electron of H atom absorbs 12.1 eV of energy
1 in its ground state it will jump to
(3) The electron must have a spin of
2
(1) 5th orbit (2) 4th orbit
(4) Both (1) & (2) are correct (3) 3rd orbit (4) 2nd orbit
(4)
Chemistry Assignment-22 Rank Enhancement Programme for NEET-19
CODE-A
Regd. Office : Aakash Tower, 8, Pusa Road, New Delhi-110005
Ph.: 011-47623456
Rank Enhancement Programme for NEET-19
CHEMISTRY ASSIGNMENT-22
Answers
1. (2) 11. (4) 21. (4) 31. (4) 41. (3)
2. (3) 12. (4) 22. (3) 32. (4) 42. (4)
3. (4) 13. (4) 23. (3) 33. (4) 43. (3)
4. (3) 14. (2) 24. (3) 34. (2) 44. (2)
5. (4) 15. (2) 25. (4) 35. (4) 45. (4)
6. (2) 16. (2) 26. (3) 36. (1) 46. (1)
7. (3) 17. (3) 27. (1) 37. (2) 47. (2)
8. (1) 18. (2) 28. (4) 38. (2) 48. (3)
9. (2) 19. (3) 29. (2) 39. (4) 49. (3)
10. (4) 20. (3) 30. (3) 40. (4) 50. (3)
(5)
