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question_answer1) The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies \[\left( \operatorname{in}\operatorname{K}\operatorname{J}\operatorname{mo}{{1}^{-1}} \right)\]of C-C, Si-Si and Ge-Ge bonds are respectively:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
348, 297, 260
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B)
297, 348, 260
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C)
348, 260, 297
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D)
260, 297, 348
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question_answer2) In which of the following exothermic reactions, the heat liberated per mole is the highest?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}\]
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B)
\[\operatorname{SrO}+{{\operatorname{H}}_{2}}\operatorname{O}\to \operatorname{Sr}{{(\operatorname{OH})}_{2}}\]
done
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C)
\[\operatorname{Ba}\operatorname{O}+{{\operatorname{H}}_{2}}\operatorname{O}\to \operatorname{B}a{{(\operatorname{OH})}_{2}}\]
done
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D)
\[\operatorname{M}g\operatorname{O}+{{\operatorname{H}}_{2}}\operatorname{O}\to \operatorname{Mg}{{(\operatorname{OH})}_{2}}\]
done
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question_answer3) Give
(A) \[n=5,\,\,{{m}_{l}}=+1\]
(B) \[n=2,\,\,l+1,\,\,\,{{m}_{l}}=-1\],\[{{\operatorname{m}}_{s}}=-1/2\]
JEE Main Online Paper ( Held On 25 April 2013 )
A)
25 and 1
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B)
8 and 1
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C)
2 and 4
done
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D)
4 and 1
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question_answer4) Which one of the following cannot function as an oxidizing agent?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[{{I}^{-}}\]
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B)
\[{{S}_{(s)}}\]
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C)
\[NO_{3}^{-}(aq)\]
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D)
\[C{{r}_{2}}O_{7}^{2-}\]
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question_answer5)
Given 
In the above compounds correct order of reactivity in electrophilic substitution reactions will be:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[b>a>c>d\]
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B)
\[d>c>b>a\]
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C)
\[a>b>c>d\]
done
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D)
\[b>c>a>d\]
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question_answer6) Which one of the following is the wrong assumption of kinetic theory of gases?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Momentum and energy always remain conserved
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B)
Pressure is the result of elasticcollision of molecules with the container's wall
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C)
Molecule are separated by great distances compared to their sizes.
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D)
All the molecule move in straight line between collision and with some velocity
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question_answer7) A radioactive isotope having a half?life period of 3 days received after 12 days. If 3g of the isotope is left in the container, what would be the initial mass of the isotope?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
12g
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B)
36g
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C)
48g
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D)
24g
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question_answer8) Which of the following statement is not correct?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Amylopectin is branched polymer of \[\alpha \]-glucose.
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B)
Cellulose is a linear polymer of \[\beta \]glucose.
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C)
Glycogen is the food reserve of plants
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D)
All proteins are polymers of \[\alpha -\]amino acids
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question_answer9)
The major product in the following reaction 
is
JEE Main Online Paper ( Held On 25 April 2013 )
A)
done
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B)
done
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C)
done
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D)
done
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question_answer10) The ratio \[\frac{\operatorname{Kp}}{\operatorname{Kc}}\] for the reaction\[CO(g)+\frac{1}{2}{{O}_{2}}(g)\rightleftharpoons C{{O}_{2}}(g)\]is :
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[\frac{1}{\sqrt{RT}}\]
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B)
\[{{(RT)}^{1/2}}\]
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C)
RT
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D)
1
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question_answer11) Copper crystallizes in fcc with a unit length of 361 pm. What is the radius of copper atom?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
157 pm
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B)
128 pm
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C)
108 pm
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D)
181 pm
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question_answer12) In which of the following sets, all the given Species are is structural?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[{{\operatorname{CO}}_{2}},\operatorname{N}{{\operatorname{O}}_{2}},Cl{{O}_{2}}Si{{O}_{2}}\]
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B)
\[PC{{l}_{3}},AlC{{l}_{3}}BC{{l}_{3}}SbC{{l}_{3}}\]
done
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C)
\[{{\operatorname{BF}}_{3}},N{{F}_{3}},P{{F}_{3}},Al{{F}_{3}}\]
done
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D)
\[\operatorname{BF}_{4}^{-}CC{{l}_{4}},NH_{4}^{+},PCl_{4}^{+}\]
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question_answer13) Given that : (i) \[{{\Delta }_{f}}{{H}^{0}}\]of\[{{N}_{2}}O\] is \[82\operatorname{k}\operatorname{j}\]\[\operatorname{mo}{{\operatorname{l}}^{-1}}\] (ii) Bond energies of N\[\equiv \]N, N=N, O=O and N=O are 946,418,498 and 607 Kj\[{{\operatorname{mol}}^{-1}}\] respectively. The resonance energy of \[{{N}_{2}}\] O is
JEE Main Online Paper ( Held On 25 April 2013 )
A)
-88 Kj
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B)
-66 Kj
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C)
-62 Kj
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D)
-44 Kj
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question_answer14) What would be the pH of a solution obtained by mixing 5g of acetic acid and 7.5g of sodium acetate and making the volume equal to 500 mL? \[(\operatorname{Ka}=1.75\times {{10}^{-5}},\operatorname{pka}=4.6)\]
JEE Main Online Paper ( Held On 25 April 2013 )
A)
pH =4.70
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B)
pH< 4.70
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C)
pH of solution will be equal to pH of acetic acid
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D)
4.76 < pH< 5.0
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question_answer15) 6 litres of an alkene require 27 litres of oxygen at constant temperature and pressure for complete combustion. The alkene is:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Ethene
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B)
Propene
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C)
1-Butene
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D)
2-Butene
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question_answer16) Bakelite is obtained from phenol by reacting with :
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Acetal
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B)
\[{{\operatorname{CH}}_{3}}\operatorname{CHO}\]
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C)
\[{{\operatorname{CH}}_{3}}\operatorname{CHO}\]
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D)
Chlorobenzene
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question_answer17) How many grams of methyl alcohol should added to 10 litre tank of water to prevent its freezing at 268 K? (\[{{\operatorname{K}}_{f}}\]for water is 1.86 K kg \[{{\operatorname{mol}}^{-1}}\])
JEE Main Online Paper ( Held On 25 April 2013 )
A)
880.07 g
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B)
899.04 g
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C)
866.02 g
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D)
868.06 g
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question_answer18) In which of the following octahedral complex species the magnitude of \[{{\Delta }_{0}}\] will be maximum?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[{{\left[ \text{Co}\left( {{\text{H}}_{\text{2}}}{{\operatorname{O}}_{6}} \right) \right]}^{2+}}\]
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B)
\[{{\left[ \text{Co}\left( \operatorname{C}{{\operatorname{N}}_{6}} \right) \right]}^{3+}}\]
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C)
\[{{\left[ \text{Co}{{\left( {{\operatorname{C}}_{2}}{{O}_{4}} \right)}_{3}} \right]}^{3-}}\]
done
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D)
\[{{\left[ \text{Co}{{\left( \operatorname{N}{{\operatorname{H}}_{3}} \right)}_{6}} \right]}^{3+}}\]
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question_answer19) In nucleophilic substitution reaction, order of halogens as incoming (attacking) nucleophiles: \[{{\operatorname{I}}^{-}}>{{\operatorname{Br}}^{-}}>{{\operatorname{CI}}^{-}}\] The order of halogens as departing nucleophile should be :
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[B{{r}^{-}}>{{I}^{-}}>C{{l}^{-}}\]
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B)
\[{{I}^{-}}>B{{r}^{-}}>C{{l}^{-}}\]
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C)
\[C{{l}^{-}}>B{{r}^{-}}>{{I}^{-}}\]
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D)
\[C{{l}^{-}}>{{I}^{-}}>B{{r}^{-}}\]
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question_answer20) The Gibbs energy for the decomposition of\[A{{l}_{2}}{{O}_{3}}\]at \[{{500}^{0}}C\] is as follows: \[\frac{2}{3}A{{l}_{2}}{{O}_{3}}\to 4/3Al+{{O}_{2}},{{\Delta }_{r}}G=+940\,kJ\,mo{{l}^{-1}}\] The potential difference needed for the electrolytic reduction of aluminium oxide at\[{{500}^{0}}C\] should be atleast:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
4.5 V
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B)
3.0 V
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C)
5.0 V
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D)
2.5 V
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question_answer21) Cannizaro?s reaction is not given by :
JEE Main Online Paper ( Held On 25 April 2013 )
A)
done
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B)
done
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C)
\[C{{H}_{3}}CHO\]
done
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D)
\[HCHO\]
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question_answer22) Pheol on heating with \[CHC{{l}_{3}}\]and \[\text{NaOH}\]gives Salicylaldehyde. The reaction is called:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Remer- Tiemenanraeaction
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B)
Claisen reaction
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C)
Cannizzareo?s reaction
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D)
Hell-volhard-Zelinsky reaction
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question_answer23) The inter nuclear distances in O-O bonds for \[\operatorname{O}_{2}^{+},{{\operatorname{O}}_{2}},\operatorname{O}_{2}^{-}\] and \[\operatorname{O}_{2}^{2-}\] respectively are:
A)
\[1.30\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.49\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.12\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.21\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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B)
\[1.49\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.21\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.12\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.30\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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C)
\[1.21\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.12\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.49\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.30\,\overset{\text{o}}{\mathop{\text{A}}}\,\,\]
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D)
\[1.12\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.21\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.30\,\overset{\text{o}}{\mathop{\text{A}}}\,,\,1.49\,\overset{\text{o}}{\mathop{\text{A}}}\,\,\]
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question_answer24) Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Vitamin A
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B)
Vitamin B
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C)
Vitamin D
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D)
Vitamin C
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question_answer25) Which one of the following arrangements represent the correct order of the proton affinity of the given species:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[{{I}^{-}}<{{F}^{-}}<H{{S}^{-}}<NH_{2}^{-}\]
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B)
\[{{\operatorname{HS}}^{-}}<\operatorname{NH}_{2}^{-}>{{\operatorname{F}}^{-}}<{{\operatorname{I}}^{-}}\]
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C)
\[{{\operatorname{F}}^{-}}<{{\operatorname{I}}^{-}}<\operatorname{NH}_{2}^{-}<{{\operatorname{HS}}^{-}}\]
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D)
\[NH_{2}^{1}<H{{S}^{-}}<{{I}^{-}}<{{F}^{-}}\]
done
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question_answer26) Carbylamines forms from aliphatic or aromatic primary amine via which of the following intermediates?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
Carbanion
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B)
Carbine
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C)
Carbonation
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D)
Carbon radical
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question_answer27) 10 mL of 2 (M) of \[\operatorname{NaOH}\] solution is added to 200 mL of 0.5 (M) of NaOH solution. What in the final concentration?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
0.57 (M)
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B)
5.7 (M)
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C)
11.4 (M)
done
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D)
1.14 (M)
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question_answer28) The structure of which of the following chloro species can be explained on basis of \[ds{{p}^{2}}\] hybridization?
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[\operatorname{Pd}Cl_{4}^{2-}\]
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B)
\[\operatorname{Fe}Cl_{4}^{2-}\]
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C)
\[{{C}_{O}}Cl_{4}^{2-}\]
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D)
\[NiCl_{4}^{2-}\]
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question_answer29)
Which of the following reagent (s) used for the conversion 
JEE Main Online Paper ( Held On 25 April 2013 )
A)
\[\text{glycol}/\text{LiAI}{{\text{H}}_{4}}/{{\operatorname{H}}_{3}}{{\operatorname{O}}^{+}}\]
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B)
\[\text{glycol}/\text{NaH/}{{\operatorname{H}}_{3}}{{\operatorname{O}}^{+}}\]
done
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C)
\[\operatorname{L}\operatorname{i}\operatorname{A}{{\operatorname{IH}}_{4}}\]
done
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D)
\[{{\operatorname{NaBH}}_{4}}\]
done
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question_answer30) A solution of copper sulphate\[({{\operatorname{CuSO}}_{4}})\]is electrolyzed for 10 minutes with a current of 1.5 ampers. The mass of copper deposited at the cathode (at. Mass of Cu=63u) is:
JEE Main Online Paper ( Held On 25 April 2013 )
A)
0.3892g
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B)
0.2938 g
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C)
0.2398 g
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D)
0.3928 g
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