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Sunday, November 29, 2015

2nd Exam Common 0451/5404/Dec’11

Duration: 21/2 Hrs.                                                                               Max. Marks: 75

1.     If the mass of an atom is 90 and number of neutrons is 50 its atomic number is
(a)  40                                                         (c) 50
(b) 90                                                         (d)140
2.     The quantum number representing shapes of the electron cloud is
(a)  N                                                          (c ) I
(b) M                                                                   (d) s
3.     The size of the nucleus of an atom is of the order of
(a)  10-8                                                                    (c)10-13
(b) 10-4                                                                    (d) 10-6
4.     The charge on the electron was found by
(a)  J.J. Thomsan
(b) Miliken
(c)  Faraday
(d) Goldstein
5.     The number of elements present in the 3rd period is
(a)  6                                                           (c) 18
(b) 32                                                         (d) 8
6.     Every period is the periodic table ends with
(a)  An alkali metal
(b) A halogen
(c)  An inert gas
(d) A trasition element
7.     The element with atomic number 26 will be found in the group
(a)  4                                                           (c) 6
(b) 8                                                           (d)10
8.     The total number of actinides in the periodic table are
(a)  12                                                         (c) 13
(b) 14                                                         (d) 15
9.     The elements of group 16 in periodic table are known as
(a)  Alkali metals
(b) Alkaline earths
(c)  Chalcogens
(d) Halogens
10.                     Halogens belong to
(a)  P-block                                                 (c) s-block
(b) D-block                                                 (d) f-block
11.                     In the periodic table, the position of the element still uncertain is of
(a)  He                                                         (c) H
(b) Li                                                          (d) C
12.                     The purest form of water obtained from natural sources is:
(a)  Spring water
(b) Rainwater
(c)  Sea water
(d) Lake water
13.                     Temporary hardness of water is due to presence of calcium and magnesium
(a)  Chlorides
(b) Sulphates
(c)  Bicarbonates
(d) Nitrates
14.                      The process of destroying the disease producing bacteria or micro-organisms from water is known as
(a)  Aeration
(b) Sedimentation
(c)  Coagulation
(d) Disinfection
15.                     Permanent hardness is due to the presence of Ca and Mg as
(a)  Carbonates only
(b) Bicarbonates only
(c)  Chlorides only
(d) Chlorides and sulphates
16.                     Permanent hardness can be removed by adding
(a)  C12                                                       (c) Na2CO3
(b) Bleaching powder                                 (d) KMnO4
17.                     The chemical name of permutit is:
(a)  Potassium zeolite
(b) Sodium zeolite
(c)  Calcium zeolite
(d) Magnesium zeolite
18.                     Hardness can be estimated
(a)  Clark’s method
(b) Soap titration method
(c)  EDTA method
(d) Both b and c
19.                     On boiling water becomes free from:
(a)  Permanent hardness
(b) Temporary hardness
(c)  Suspended impurities
(d) Floating impurities
20.                     Exhausted permutit is regenerated by washing it with:
(a)  NaCl                                  (c) NaOH
(b) HCl                                    (d)KOH
21.                     The temporary hardness of water due to calcium bicarbonates can be removed by:
(a)  Bleaching power
(b) Sodium carbonate
(c)  Chlorine
(d) Potassium carbonate
22.                     In hot soda lime process, temporary hardness of water can be removed by
(a)  Lime
(b) Magnesium hydroxide
(c)  Fine sand layer
(d) Coarse sand layer
23.                     The process of removing extra common salt from water is called:
(a)  De—ionization
(b) Desalination
(c)  Disinfection
(d) Softening
24.                     Coagulants help in setting of:
(a)  Colloidal particles only
(b) Fine suspended impurities
(c)  Suspended impurities only
(d) Both a and c
25.                     A law which governs the effect of conc. On the rate of reaction is called
(a)  Dalton law
(b) Le-chatelier’s principle
(c)  Law of chem.. equilibriul
(d) Law of mass action
26.                     Theory of ionization was given by:
(a)  Bohr                                            (c) Arrhenius
(b) Rutherford                                  (d) Newton
27.                     The conjugate acid of NH2- is
(a)  NH3                                                                           (c) NH2OH
(b) NH4                                                                           (d) N2H4
28.                     Ionic product of water changes when
(a)  Anacid is added to water
(b) A base is added to water
(c)  Both acid and base are added to water
(d) Temp is changed
29.                     A buffer mixture of ammonium chloride and ammonium hydroxide is diluted with water, its pH will
(a)  Increases                                     (c) remains the same
(b) Decreases                                    (d)becomes 7
30.                     Buffer action of a buffer is due to:
(a)  Association
(b) Common ion effect
(c)  Dissociation
(d) Heat production
31.                     The indicator used in titration of strong acid and strong base is
(a)  Litmus
(b) Phenolphathalein
(c)  Methyl orange
(d) Methyl red
32.                     HCl is stronger acid than acetic acid because
(a)  It can neutralize large quantity of alkali
(b) It can corrode anything it comes in contact
(c)  It ionizes completely to ions in aqueous soln.
(d) None of these
33.                     Hydrolysis of sodium acetate will give:
(a)  Basis soln.
(b) Acidic soln.
(c)  Neutral soln.
(d) Normal soln.
34.                     Anaqueous soln. whose pH is O is:
(a)  Alkaline
(b) Neutral
(c)  Acidic
(d) Amphoteric
35.                     The unit of electrochemical equivalent is:
(a)  Gram
(b) Gram/ampere
(c)  Gram/coulombs
(d) Coulombs/gram
36.                     One faraday is equal to
(a)  9650 coulombs
(b) 39650 coulombs
(c)  29650 coulombs
(d) 96500 coulombs
37.                     One electrolysis is of dil. H2SO soln. between platinum electrodes, this gas evolved at the anode is
(a)  O2
(b) H2
(c)  SO2
(d) SO2
38.                     Which of the following battery is rechargeable?
(a)  Dry cell
(b) Mercury cell
(c)  Ni-Cd cell
(d) H2-O2 cell
39.                     In electrolytic refining metal to be purified is made as:
(a)  Anode
(b) Cathode
(c)  None
(d) Neutral
40.                     Reducing agent is a substance which can
(a)  Accept electrons
(b) Accept protons
(c)  Donate electrons
(d) Donate protons
41.                     E.C.E. is more for
(a)  Hydrogen
(b) Zinc
(c)  Silver
(d) Copper
42.                     During electrolysis, all ions
(a)  Move in the same direction
(b) Move towards oppositely charged electrode
(c)  Remains stationary
(d) None of these
43.                     Electric current is the flow of
(a)  Ions
(b) Atoms
(c)  Electrons
(d) None of these
44.                     When aqueous sodium chloride is electro lysed, the product obtained at the cathode is
(a)  Hydrogen
(b) Chlorine
(c)  Sodium metal
(d) Oxygen
45.                     The reactions in which oxidation and reduction to side by side are called
(a)  Oxidation reaction
(b) Reduction reaction
(c)  Redox reaction
(d) Exothermic reaction
46.                     In the electroplating of metals, anode is made up of
(a)  Pure metal
(b) Impure metal
(c)  Both a and b
(d) electrolyte
47.                     Tetravalency of carbon can be explained by
(a)  Resonance
(b) Hybridization
(c)  Inductive effect
(d) None of these
48.                     Graphite is used as electrodes because ‘it has the property of:
(a)  Good conduction of electricity
(b) Bad conduction of electricity
(c)  Metallic lustre
(d) None of these
49.                     The property of self linking of carbon atoms is known as
(a)  Catenation
(b) Polymerization
(c)  Carbonization
(d) None of these
50.                     The common name of H3CCOOH is:
(a)  Formic acid
(b) Acetic acid
(c)  Carbonic acid
(d) None of these
51.                     Hydrocarbons containing triple bonds are known as:
(a)  Alkane nitriles
(b) Imines
(c)  Amines
(d) Amides
52.                     The organic compound present in vinegar is:
(a)  Ethanoic acid
(b) Propanoic acid
(c)  Methanoic acid
(d) Butanoic acid
53.                     The aromatic smell of flowers is due to the presence of:
(a)  Alcohols
(b) Acids
(c)  Esters
(d) Amines
54.                     Which of the following is not one of the seven fundamental units?
(a)  Kilogram
(b) Candela
(c)  Mole
(d) Watt
55.                     I calorie=……………………………. Joules
(a)  4.2
(b) 4.8
(c)  4.6
(d) 4.9
56.                     Freezing point of water at 1 atm pressure of Kelvin scale is
(a)  0 K
(b) 1 K
(c)  -273 K
(d) +273 K
57.                     Which of the following is not an element?
(a)  Diamond
(b) Graphite
(c)  Ozone
(d) Sand
58.                     Which of the following is a metalloid?
(a)  Antimony
(b) Aluminium
(c)  Copper
(d) Silver
59.                     Which has the maximum viscosity?
(a)  Water
(b) Glycol
(c)  Acetone
(d) Ethanol
60.                     The charge on a cation M is +2 and on anion A is -3. The compound formed has the formula
(a)  MA2
(b) M2A3
(c)  M3A2
(d) M2A
61.                     NaCl is a chemical formula of:
(a)  Washing soda
(b) Baking soda
(c)  Sugar
(d) Common salt
62.                     Which of the following has the largest number of atoms?
(a)  0.5 g atom of C.
(b) .5 g of C
(c)  0.25 mole of C
(d) 1 g of C
63.                     Mass of 0.40 moles of CO2 is
(a)  40g
(b) 44g
(c)  17.6g
(d) 12.6g
64.                     I a.m.u. is mass of:
(a)  1 atom of C
(b) 12 atoms of C
(c)  1/12th of C atom
(d) 6.022 x 1023 atoms of C
65.                     Mass of 0.1 mole of CaCO3 is
(a)  1g
(b) 10g
(c)  100g
(d) 1000g
66.                     Neutrons are present in all atoms except
(a)  He
(b) C
(c)  H
(d) Ne
67.                     The designation of an orbital with n=4 and 1=3 is
(a)  4s
(b) 2P
(c)  4d
(d) 4f
68.                     The lightest particle among the following is
(a)  Proton
(b) Neutron
(c)  Electron
(d) Atom of hydrogen
69.                     A pie bond is formed by the overlapping of
(a)  S-s orbital
(b) P-p
(c)  S-p orbital
(d) D-d orbital
70.                     Series of lines present in visible region of Hydrogen spectrum is
(a)  Lyman
(b) Balmer
(c)  Paschen
(d) Brackett
71.                     As we move away from nucleus, the energy of the shell
(a)  Decrease
(b) Increases
(c)  Remains the same
(d) Neither decreases nor
72.                     Which of the following noble gases has lowest atomic number
(a)  Ne
(b) He
(c)  Kr
(d) Xe
73.                     The shape of 2s orbital is
(a)  Dumbbell
(b) Pyramidal
(c)  Spherical

(d) Tetrahedral


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