WBJEE 2014 | Chemistry
- Total No of Questions - 50
- Total Time - 50 minutes
- No negative marking.
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Question 1 |
250 ml of a sodium carbonate solution contains 2.65 g of Na2 CO3 . If 10 ml of this solution is diluted to one liter, what is the concentration of the resultant solution (Mol.wt. of Na2 CO3 = 106) ?
A | 0.1 M |
B | 0.01 M |
C | 0.001 M |
D | 10-4 M |
Question 2 |
One gram atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were 393.5 kJ and 395.4 kJ respectively. It follows that :
A | graphite has greater affinity of oxygen |
B | diamond has great affinity for oxygen |
C | graphite is stable than diamond |
D | diamond is stable than graphite |
Question 3 |
Which of the element is used for detecting obstruction in the digestive system ?
A | Be |
B | Mg |
C | Ca |
D | Ba |
Question 4 |
KMnO4 oxidizes oxalic acid in acidic medium. The no of CO2 molecules produced as per the balanced equation is :
A | 6 |
B | 8 |
C | 10 |
D | 3 |
Question 5 |
Which of the following is least stable?
A | LI- |
B | Be- |
C | B- |
D | C- |
Question 6 |
For which of the following species Bohr's theory is not applicable ?
A | Be3+ |
B | li2+ |
C | He2+ |
D | H |
Question 7 |
Rancidification is formed by :
A | hydrolisis |
B | reduction |
C | oxidation |
D | (a) and (a) both |
Question 8 |
Whose name is not associated with the development of periodic table?
A | Prout's |
B | Newlands |
C | Rutherford |
D | Lother Mayer |
Question 9 |
In group of 15 elements which elements show a fractional oxidation state :
A | N |
B | As |
C | Sb |
D | Bi |
Question 10 |
Mechanical work is specially important in the system that contain :
A | solid-liquid |
B | liquid-liquid |
C | solid-solid |
D | gases |
Question 11 |
Addition of arsenic to germanium makes the latter:
A | metalic condductor |
B | intrinsic semiconductor |
C | mixed conductor |
D | extrinsic conductor |
Question 12 |
The proper rays for radiocarbon dating are :
A | UV rays |
B | IR rays |
C | cosmic rays |
D | X rays |
Question 13 |
The reagent NH4Cl and aqueous NH3 will precipitate :
A | Ca2+ |
B | Al3+ |
C | Mg2+ |
D | Zn2+ |
Question 14 |
A chemical reaction was carried out at 300 K and 280 K. The rate constants were found to be k1 and k2 respectively. Then
A | k2 = 4k1 |
B | k2 = 2k1 |
C | k2 = 0.25 k1 |
D | k2 = 0.5 k1 |
Question 15 |
Which of the following is used in Holme's signals for ships?
A | NH3 |
B | PH3 |
C | SbH3 |
D | AsH3 |
Question 16 |
A set of compound in which the re-activity of halogen in the ascending order is :
A | Chlorobenzene , vinyle Chloride, Chloroethane |
B | Chloroethane , Chlorobenzene , vinyle Chloride |
C | vinyle Chloride , Chlorobenzene , Chloroethane |
D | vinyle Chloride , Chloroethane , Chlorobenzene |
Question 17 |
Which of the following set of quantum no is not applicable for an electron in an atom ?
A | n=1, l=1, m=1, s= +1/2 |
B | n=1, l=0, m=0, s= +1/2 |
C | n=2, l=0, m=0, s= +1/2 |
D | n=2, l=0, m=0, s= -1/2 |
Question 18 |
Zwitter is formed by :
A | aniline |
B | acetanilide |
C | benzoic acid |
D | lysine |
Question 19 |
The process of converting hydrated alumina into anhydrous alumina is called :
A | roasting |
B | smelting |
C | dressing |
D | calcination |
Question 20 |
Hannary and Smith relationship is used to calculate :
A | ionic character |
B | electron affinity |
C | ionization energy |
D | ionization potential |
Question 21 |
To become a carbohydrate a compound must contain at least :
A | 2 carbons |
B | 3 carbons |
C | 4 carbons |
D | 6 carbons |
Question 22 |
Azurite is an ore of :
A | gold |
B | silver |
C | copper |
D | zinc |
Question 23 |
Solution of 0.1 N NH4 OH and 0.1 NH4 Cl has pH 9.25 . Then pKb of NH4 OH is :
A | 9.25 |
B | 4.75 |
C | 3.75 |
D | 8.25 |
Question 24 |
Which of the following oxide is known as nitronium nitrate ?
A | NO2 |
B | N2O3 |
C | N2O5 |
D | NO |
Question 25 |
Which of the following will have least hundred rotation about carbon-carbon bond?≡
A | CH2 = CH2 |
B | CH ≡ CH |
C | C2 H6 |
D | C2 Cl6 |
Question 26 |
Which of the following species are isoelectronic ?
(I) CH 3 + (II) H3 O (III) NH3 (IV) CH3 -
A | I and II |
B | I and IV |
C | I and III |
D | II, III and IV |
Question 27 |
Which one of the following bond is present in silica?
A | -Si-O-Si-O-Si- |
B | -Si-C-Si-O-Si- |
C | -Si-C-Si-C-Si- |
D | -Si-Si-Si- |
Question 28 |
Which one of the following is the most reactive towards nucleophilic substitution reaction ?
A | CH2 = CH - Cl |
B | C6 H5 Cl |
C | CH3 CH = CH - Cl |
D | ClCH2 - CH = CH2 |
Question 29 |
The cl-cl-cl angle in 1,1,2,2 tetrachloro ethene and tetrachloro methene respectively are :
A | 120° and 109.5° |
B | 90° and 109.5° |
C | 109.5° and 90° |
D | 109.5° and 120° |
Question 30 |
The de brogile wavelength association with a ball of mass 200 g and moving at a soeed of 5 m/s is of the order of (h = 6.625 × 10-34 Js)
A | 10-20 m |
B | 10-25 m |
C | 10-30 m |
D | 10-35 m |
Question 31 |
After equal volumes of 0.10 M solutions of (NH4)2 SO4 and Ba(OH)2 have been mixed which of the following species is present in greatest concentration in solution?
A | NH4+(aq) |
B | Ba2+(aq) |
C | NH3(aq) |
D | BaSO4(aq) |
Question 32 |
Diborane on reaction with olefins forms :
A | mono acid derivatives |
B | diethyl borane |
C | triethyl borane |
D | ethyl borane |
Question 33 |
Ice floats on water because :
A | its density is less than that of water |
B | crystal structure of ice has empty space |
C | both of the above |
D | none of the above |
Question 34 |
Magic no s are?
A | principle quantum no |
B | azimuthal quantum no |
C | magnetic quantum no |
D | 2, 8, 18, 32 |
Question 35 |
The even numbered alkanes have much higher melting point than the next lower n-alkane with odd no of carbon atom. This is due to :
A | intermoleculer forces |
B | size of the molecule |
C | arrangement of molecules in the crystal lattice |
D | all of the above |
Question 36 |
When ice melts into water entropy :
A | becomes zero |
B | decreases |
C | increases |
D | remain same |
Question 37 |
Sodium Carbonate is manufactured by :
A | lowing process |
B | leblanc process |
C | solvay process |
D | Haber's process |
Question 38 |
The standard reduction potential for Fe2+ / Fe and Sn2+ / Sn electrodes are -0.44 and -0.14 volt respectively . For the cell reaction Fe2+ + Sn → Fe + Sn2+ , the standard emf is :
A | +0.30 V |
B | -0.58 V |
C | +0.58 V |
D | -0.30 V |
Question 39 |
The flocculation value is expressed in terms of :
A | milimol per litre |
B | mol per litre |
C | gram per litre |
D | mol per mililitre |
Question 40 |
When the more electro positive metal displace less electropositive metals from their salt solution this process is called
A | auto reduction |
B | electro reduction |
C | hydromettalurgy |
D | none of these |
Question 41 |
Which of the following oxide is known as nitronium nitrate?
A | NO2 |
B | N2 O3 |
C | N2 O5 |
D | NO |
Question 42 |
3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water , 20 ml of this solution requires 18 ml of KMnO4 during titrating of complete oxidation. The weight of KMnO4 present in one liter solution is :
A | 3.476 g |
B | 12.38 g |
C | 34.76 g |
D | 1.238 g |
Question 43 |
When sodium dryoxide react with sand, it forms :
A | sodium silicate |
B | silicon oxide |
C | silicon hydroxide |
D | none of the above |
Question 44 |
Acetamide is :
A | neutral |
B | basic |
C | acidic |
D | amphoteric |
Question 45 |
The rates of a gaseous reaction is given by the expression k[A][B] . If the vol of the reaction vessel is suddenly reduced to 1/4 th of the initial volume, the reaction rate relating to original rate will be :
A | 1/10 |
B | 1/8 |
C | 8 |
D | 16 |
Question 46 |
Calculate the temperature at which ΔH = 145.6 kJ mol-1 ,ΔG = -5.2 kJ mol-1 and ΔS = 216 J k-1 mol-1 for a chemical reaction :
A | 698.1o C |
B | 698.1 K |
C | 130 K |
D | 130 o C |
Question 47 |
An ester used as medicine is :
A | ethyl acetate |
B | methyl acetate |
C | methyl salicylate |
D | ethyl benzonate |
Question 48 |
A sample of 4.12 mg of unknown alcohol is added to CH3 MgBr then 1.56 mL of methane at STP was liberated. The alcohol is :
A | C2 H5 OH |
B | CH3 OH |
C | C3 H7 OH |
D | C4 H9 OH |
Question 49 |
Which isomeric form of benzene hexachloride is used as insecticide :
A | HNO3 |
B | O2 |
C | O3 |
D | KmnO4 |
Question 50 |
C(s) + O2 (g) → CO2 (g) ΔH=-94 kcal
2CO(s) + O2 (g) → 2CO (g) ΔH=-135.2 kcal
the heat of formation of CO(g) is :
A | -26.2 kcal |
B | 41.2 kcal |
C | 26.4 kcal |
D | 229.2 kcal |
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