Download 1. The compound which could act both as oxidising as well as

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The compound which could act both as oxidising as well as reducing agent is
(b) MnO2
(a) SO2
(c) Al2O3
(d) CrO3
Addition of iron and zinc to copper sulphate causes precipitation of copper,
occuring due to the
(a) ionisation of CuSO4
(b) oxidation of Cu++
(c) hydrolysis of CuSO4
(d) reduction of Cu++
In the reaction,
2Ag + 2H2SO4 Ag2SO4 + SO2 + 2 H2O,
the H2SO4 acts an an/a
(a) dehydrating agent
(b) catalytic agent
(c) reducing agent
(d) oxidising agent
Iodine oxidises S2O32– ion to
(a) S2–
(b) SO32–
(d) S4O62–
(c) SO42–
In the mixture of (NaHCO3 + Na2 CO3), volume of HCl required is x ml. with
phenolphthalein indicator and y ml with methyl orange indicator in the same
titration. Hence volume of HCl for complete reaction of Na2CO3 is
(a) 2x
(b) y
(c) x/2
(d) (y – x)
20 ml. of x M HCl neutralises completely 10 ml. of 0.1 M NaHCO3 solution
and a further 5ml of 0.2 M Na2CO3 solution to methyl orange end point. The
value of x is
(a) 0.167 M
(b) 0.133 M
(c) 0.15 M
(d) 0.20 M
Atomic weight of barium is 137.34. The equivalent weight of barium in BaCrO4
used as ox- idising agent in acid medium is
(a) 137.34
(b) 45.78
(c) 114.45
(d) 68.67
The oxidation number of Cl in Cl2O7 is
(a) + 7
(b) + 5
(c) + 3
(d) – 7
The elements undergoing reduction and oxidation during the reaction,
(NH4)2Cr2O7 → N2 + Cr2O3 +4H2O
are respectively
(a) N and Cr
(b) Cr and N
(c) N and O
(d) Cr and O
3 Br2 + 6 NaOH → NaBrO3 + 5NaBr + 3 H2O
In the above reaction, which element loses as well as gains electrons?
(a) Na
(b) Br
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(c) O
(d) none
In the reaction,
NO3– + H+ + xe– NO + H2O,
the value of x is
(a) 4
(b) 2
(c) 3
(d) 1
The value of x in
2 IO3– + xI– + 12 H+ 6 I2 + 6 H2O is
(a) 2
(b) 12
(c) 6
(d) 10
Radiation is emitted when a hydrogen atom goes from a high energy state to a
lower energy state. The wavelength of one line in visible region of atomic spectrum
of hydrogen is 6.5 × 10–7 m. Energy difference between the two states is
(a) 3.0 × 10– 19 J
(b) 1.0 × 10– 18 J
–
10
J
(d) 6.5 × 10– 7 J
(c) 5.0 × 10
Consider these ions:
(b) Co2+
(a) Ni2+
2+
(d) Fe3+
(c) Cr
(atomic numbers: Cr = 24, Fe = 26, Co = 27, Ni = 28)
The correct sequence of the increasing order of the number of unpaired electrons
in these ions is
(a) 1, 2, 3, 4
(b) 4, 2, 3, 1
(c) 1, 3, 2, 4
(d) 3, 4, 2, 1
If Auf - bau rule is not followed, 19th electron in Fe (Z = 21) will have
(a) n = 3, l = 0 (b) n = 3, l = 1
(c) n = 3, l = 2 (d) n = 4, l = 0
If travelling at equal speeds, the longest wavelength of the following matter-waves is
that of
(a) electron
(b) proton
(c) neutron
(d) alpha particle
If each orbital can hold a maximum of 3 electrons, number of elements in
fourth period of periodic table is
(a) 48
(b) 54
(c) 27
(d) 36
Which of the following statements is not correct for an electron that has the
quantum numbers n = 4 and m = 2?
(a) the electron may have the quantum numbers = + ½
(b)the electron may have the quantum number l = 2
(c) the electron may have the quantum number l = 3
(d)the electron may have the quantum number l = 0, 1, 2, 3
For a d-electron, the orbital angular momentum is
(a) √ 6
(b) √ 2
(c)
(d)
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Nitrogen has an electronic configuration 1s2, 2s2, 2px1, 2py1, 2pz1 and not 1s2,
2s2, 2px2, 2py1, 2pz0. It was proposed by
(a) Aufbau principle
(b) Pauli’s exclusion principle
(c) Hund’s rule
(d) Uncertainty principle
If each hydrogen atom is excited by giving 8.4 eV of energy, then the number of
spectral lines emitted is equal to
(a) zero
(b) two
(c) three
(d) four
Which of the following has the maximum number of unpaired electrons?
(b) Ti3+
(a) Mg2+
3+
(d) Fe2+
(c) V
Which is the correct order of the wave number of the following radiations: I.R.,
U.V., radiowaves, X-rays and visible light?
(a) X-rays > U.V. > I.R. >visible > radio waves
(b)X-rays > U.V. > visible > I.R. > radiowaves
(c) radiowaves > I.R. > U.V.> X-rays > visible
(d)X-rays > radiowaves > U.V. > I.R. > visible
The velocity (cm/sec.) of an electron placed in the third orbit of the hydrogen
atom is equal to
(a) 0.75 × 107 cm/sec. (b) 7.5 × 107 cm/sec.
(c) 6.729 × 108 cm/sec. (d) 7.29 × 108 cm/sec.
The wavelength of Kα characteristic X-ray of iron and potassium are 1.931 ×
10–8 and 3.737 × 10–8 cm respectively. The atomic number of the element of
which characteristic Kα wavelength is 2.289 × 10–8cm is
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(a) 24
(b) 0
(c) 32
(d) 12
In a chemical reaction,
K2Cr2O7 + x H2SO4 + y SO2 → K2SO4 + Cr2(SO4)3 + z H2O
x, y, z are respectively
(a) 1, 3, 1
(b) 4, 1, 4
(c) 3, 2, 3
(d) 1, 2, 1
N2 + 3 H2 → 2 NH3
Molecular weight of NH3 and N2 are x1 and x2, their equivalent weight are
y1 and y2. Then (y1 – y2) is
(a)
(b) (x1 – x2)
(d) (x1 – 3 x2)
(c) (3x1 – x2)
Mass of KHC2O4 (potassium acid oxalate) required to reduce 100 ml. of 0.02
M KMnO4 in acidic medium is x g and to neutralise 100 ml. of 0.05 M
Ca(OH)2 is y g, then
(a) x = y
(b) 2x = y
(c) x = 2y
(d) None
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A mixture of Na2C2O4 (A) and KHC2O4 . H2C2O4 (B) required equal volumes
of 0.1 M KMnO4 and 0.1 M NaOH, separately. Molar ratio of A and B in
this mixture is
(a) 1 : 1
(b) 1 : 5.5
(c) 5.5 : 1
(d) 3.1 : 1
3 mole of a mixture of FeSO4 and Fe2(SO4)3 required 100 ml. of 2 M
KMnO4 solution in acidic medium. Hence mole fraction of FeSO4 in the
mixture is
(a) 1/3
(b) 2/3
(c) 2/5
(d) 3/5
The pH of blood does not appreciably change by a small addition of an acid or a
base because blood
(a) contains serum protein which acts as buffer
(b)contains iron as a part of the molecule
(c) can be easily coagulated
(d)is a body fluid
Chemical name of vitamin A is
(a) thiamine
(b) retinol
(c) ascorbic acid
(d) nicotinamide
Glucose and fructose are
(a) optical isomers
(b)functional isomers
(c) chain isomers
(d)position isomers
Vitamin C is
(a) ascorbic acid
(b) nicotinic acid
(c) citric acid
(d) tartaric acid
The sweetest of all sugars is
(a) glucose
(b) maltose
(c) sucrose
(d) fructose
The function of enzymes in the living system is to
(a) transport oxygen
(b)provide immunity
(c) catalyse biochemical reactions
(d)provide energy
Which substance is not present in nucleic acids?
(a) cytosine
(b) adenine
(c) thymine
(d) guanidine
Which of the following is correct about H-bonding in nucleotide?
(a) A – T, G – C (b) A – G, T – C
(c) G – T, A – C (d) A – A, T – T
In DNA, the complementary bases are
(a) uracil and adenine : cytosine and guanine
(b) adenine and thymine : guanine and cytosine
(c) adenine and thymine : guanine and uracil
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(d) adenine and guanine : thymine and cytosine
The equivalent mass of iron in the reaction,
2 Fe + 3Cl2 → 2FeCl3 is
(a) half of its atomic mass
(b)one third of its atomic mass
(c) same as its atomic mass
(d)one fourth of its atomic mass
In the reaction,
4NH3+ 5O24NO + 6H2O. When one mole of ammonia and one mole of oxygen
are made to react to completion, then
(a) 1.0 mole of H2O is produced
(b)all the oxygen is consumed
(c) 1.0 mole of NO is formed
(d)all the ammonia is consumed
One mole of calcium phosphide on reaction with excess of water gives
(a) one mole of phosphine (PH3)
(b)two moles of phosphine
(c) two moles of phosphoric acid
(d)one mole of P2O5
The reaction of calcium with water is represented by the equation
Ca+2H2OCa(OH)2+ H2.
The volume for hydrogen measured at STP that would be liberated when 8 g
calcium completely reacts with water is
(b) 2240 cm3
(a) 4480 cm3
(d) 0.4 cm3
(c) 1120 cm3
An aqueous solution of 6.3 g of oxalic acid dihydrate is made up to 250 ml. The
volume of 0.1 N NaOH required to completely neutralise 10ml of this solution is
(a) 40 ml
(b) 20 ml
(c) 10 ml
(d) 4 ml
254g of idone and 142g of chlorine are made to react completely to give a
mixture of ICl and ICl3. The moles of each one formed is
(a) 0.1 mole ICl and 0.1 mole ICl3
(b)1.0 mole ICl and 1.0 mole ICl3
(c) 0.5 mole ICl and 0.1 mole ICl3
(d)0.5 mole ICl and 1.0 mole ICl3
Assuming complete dissociation of sulphuric acid as
(H2SO4 2H+ + SO42–),
the number of sulphate ions present in 50 ml of 0.1 M H2SO4 solution is
(a) 5 × 10–3 mole
(b)3.01 × 1021 mole
(c) 5 × 1023 mole
(d)3.01 × 10–3 mole
The equivalent weight of MnSO4 is half its molecular weight, when it is converted
to
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(a) Mn2O3
(b) MnO2
(d) MnO42–
(c) MnO4–
1.25g of a solid dibasic acid is completely neutralised by 25 ml. of 0.25 M
Ba(OH)2. The molecular mass of the acid is
(a) 100
(b) 150
(c) 120
(d) 200
The coordination compound cis-plain, cis-pt(NH3)2 Cl2 is a medicine for treatment
of which one of the following?
(a) Malaria
(b) Cancer
(c) Anaemia
(d) Daibetes
Magnetic moment of V (Z = 23), Cr (Z = 24) and Mn (Z = 25) are x, y and z
respectively. Then
(a) x = y = z
(b) x < y < z
(c) x < z < y
(d) z < y < x
Magnetic moment of Xn+(Z= 26) is 24 B.M. Hence number of unpaired electrons
and value of ‘n’ respectively are
(a) 4, 2
(b) 2, 4
(c) 3, 1
(d) 0, 2
Total number of orbitals in a shell having principle quantum number ‘n’ is
(a) 2n
(b) n2
(c) 2n2
(d) (n + 1)
The correct set of four quantum numbers for the valence electron of rubidium (Z =
37) is
(a) n = 5, l = 0, m = 0, s = + ½
(b)n = 5, l = 1, m = 0, s = + ½
(c) n = 5, l = 1, m = 1, s = + ½
(d)n = 6, l = 0, m = 0, s = + ½
If the radius of first Bohr orbit is x, then de- Broglie wavelength in third Bohr orbit
is nearly
(a) 2 p x
(b) 6 p x
(c) 9 x
(d) x/3
Yeast is a
(a) bacteria
(b) antibiotic
(c) virus
(d) fungi
RH2(ion exchange resin) can replace Ca2+ ions in hard water,
RH2 + Ca2+ RCa + 2H+
1L of hard water after passing through RH2 has pH = 2. Hence hardness in ppm. of
Ca2+ is
(a) 200
(b) 100
(c) 50
(d) 125
100 ml of H2O2 is oxidised by 100 ml of 1M KMnO4 in acidic medium. 100
ml of the same H2O2 is oxidised by V ml. of 1M KMnO4 in basic medium.
Hence V is
(a) 500
(b) 100
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(c) 100 / 3
(d) 500 / 3
The normality of 0.3 M phosphorus acid (H3PO4) is
(a) 0.1
(b) 0.9
(c) 0.3
(d) 0.6
How many mole of Fe2+ ions are formed, when excess of iron is treated with 50
ml of 4.0 M HCl under inert atmosphere ? (Assume no change in volume).
(a) 0.4
(b) 0.1
(c) 0.2
(d) 0.8
Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration
of NO3– ions in the mixture will be
(a) 0.1 M
(b) 0.05 M
(c) 0.2 M
(d) 0.15 M
Answer Keys
1. (a) 2. (d) 3. (d) 4. (d) 5. (a) 6. (c) 7. (b) 8. (a) 9. (b) 10. (b) 11. (c) 12. (d)
13. (a) 14. (a) 15. (c) 16. (a) 17. (c) 18. (d) 19. (a) 20. (c) 21. (a) 22. (d) 23. (b) 24. (c)
25. (a) 26. (a) 27. (a) 28. (b) 29. (c) 30. (a) 31. (a) 32. (b) 33. (b) 34. (a) 35. (d) 36. (c)
37. (d) 38. (a) 39. (b) 40. (b) 41. (b) 42. (b) 43. (a) 44. (a) 45. (b) 46. (a, b) 47. (b) 48. (d)
49. (b) 50. (c) 51. (a) 52. (b) 53. (a) 54. (b) 55. (a) 56. (a) 57. (d) 58. (d) 59. (b) 60. (b)