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question_answer1) The correct statement about the synthesis of erythritol \[(C{{(C{{H}_{2}}OH)}_{4}})\]used in the preparation of PETN is:
JEE Main Online Paper (Held On 10 April 2016)
A)
The synthesis requires two aldol condensations and two Cannizzaro reactions.
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B)
Alpha hydrogens of ethanol and methanol are involved in this reaction.
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C)
The synthesis requires four aldol condensations between methanol and ethanol.
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D)
The synthesis requires three aldol condensations and one Cannizzaro reaction.
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question_answer2) The following statements concern elements in the periodic table. Which of the following is true?
JEE Main Online Paper (Held On 10 April 2016)
A)
The Group 13 elements are all metals.
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B)
All the elements in Group 17 are gases.
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C)
Elements of Group 16 have lower ionization enthalpy values compared to those of Group 15 in the corresponding periods.
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D)
For Group 15 elements, the stability of +5 oxidation state increases down the group.
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question_answer3) Identify the incorrect statement:
JEE Main Online Paper (Held On 10 April 2016)
A)
Rhombic and monoclinic sulphur have S8 molecules.
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B)
\[{{S}_{8}}\] ring has a crown shape.
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C)
\[{{S}_{2}}\] is paramagnetic like oxygen.
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D)
The S-S-S bond angles in the \[{{S}_{8}}\]and \[{{S}_{6}}\] rings are the same.
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question_answer4) Assertion: Among the carbon allotropes, diamond is an insulator, Whereas, graphite is a good conductor of electricity. Reason: Hybridization of carbon in diamond and graphite are \[s{{p}^{3}}\]and \[s{{p}^{2}},\]respectively.
JEE Main Online Paper (Held On 10 April 2016)
A)
Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.
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B)
Assertion is incorrect statement, but the reason is correct.
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C)
Both assertion and reason are correct, and the reason is the correct explanation for the assertion.
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D)
Both assertion and reason are incorrect.
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question_answer5)
The "N" which does not contribute to the basicity for the compound is :
JEE Main Online Paper (Held On 10 April 2016)
A)
N 7
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B)
N 1
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C)
N 9
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D)
N 3
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question_answer6)
Bromination of cyclohexene under conditions given below yields:
JEE Main Online Paper (Held On 10 April 2016)
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_answer7) The commercial name for calcium oxide is:
JEE Main Online Paper (Held On 10 April 2016)
A)
Quick lime
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B)
Milk of lime
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C)
Slaked lime
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D)
Limestone
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question_answer8)
Which one of the following reagents is not suitable for the elimination reaction ?
JEE Main Online Paper (Held On 10 April 2016)
A)
NaI
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B)
\[NaOH/{{H}_{2}}O-EtOH\]
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C)
\[NaOH/{{H}_{2}}O\]
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D)
\[NaOEt/EtOH\]
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question_answer9) Which of the following is a bactericidal antibiotic?
A)
Erythromycin
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B)
Tetracycline
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C)
Ofloxacin
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D)
Chloramphenicol
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question_answer10) A solid XY kept in an evacuated sealed container undergoes decomposition to form a mixture of gases X and Y at temperature T. The equilibrium pressure is 10 bar in this vessel. \[{{K}_{P}}\] for this reaction is :
JEE Main Online Paper (Held On 10 April 2016)
A)
25
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B)
5
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C)
0
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D)
100
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question_answer11) The transition metal ions responsible for color in ruby and emerald are, respectively :
JEE Main Online Paper (Held On 10 April 2016)
A)
\[\text{C}{{\text{r}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{r}}^{\text{3+}}}\]
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B)
\[\text{C}{{\text{o}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{o}}^{\text{3+}}}\]
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C)
\[\text{C}{{\text{o}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{r}}^{\text{3+}}}\]
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D)
\[\text{C}{{\text{r}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{o}}^{\text{3+}}}\]
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question_answer12) Which of the following polymers is synthesized using a free radical polymerization technique?
JEE Main Online Paper (Held On 10 April 2016)
A)
Teflon
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B)
Melamine polymer
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C)
Nylon 6,6
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D)
Terylene
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question_answer13) Extraction of copper by smelting uses silica as an additive to remove :
JEE Main Online Paper (Held On 10 April 2016)
A)
FeS
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B)
FeO
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C)
\[C{{u}_{2}}S\]
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D)
\[C{{u}_{2}}O\]
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question_answer14) Initially, the root mean square (rms) velocity of \[{{N}_{2}}\]molecules at certain temperature is u. If this temperature is doubled and all the nitrogen molecules dissociate into nitrogen atoms, then the new rms velocity will be :
JEE Main Online Paper (Held On 10 April 2016)
A)
2 u
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B)
14 u
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C)
u / 2
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D)
4 u
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question_answer15) Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25 ; Ole ate : 0.04 - 1.0 ; Starch : 15 - 25. Which among these is a better protective colloid ?
JEE Main Online Paper (Held On 10 April 2016)
A)
Gelatin
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B)
Starch
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C)
Gum Arabic
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D)
Ole ate
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question_answer16) Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with HBF4. Which of the following conditions is correct about this reaction?
JEE Main Online Paper (Held On 10 April 2016)
A)
Only heat
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B)
\[NaN{{O}_{2}}/Cu\]
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C)
\[C{{u}_{2}}O/{{H}_{2}}O\]
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D)
\[NaF/Cu\]
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question_answer17) Identify the correct statement:
JEE Main Online Paper (Held On 10 April 2016)
A)
Corrosion of iron can be minimized by forming an impermeable barrier at its surface.
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B)
Iron corrodes in oxygen-free water.
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C)
Iron corrodes more rapidly in salt water because its electrochemical potential is higher.
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D)
Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.
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question_answer18) An aqueous solution of a salt \[M{{X}_{2}}\] at certain temperature has a van't Hoff factor of 2. The degree of dissociation for this solution of the salt is :
JEE Main Online Paper (Held On 10 April 2016)
A)
0.67
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B)
0.33
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C)
0.80
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D)
0.50
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question_answer19) Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0.2 Faraday electricity through an aqueous solution of potassium succinate, the total volume of gases (at both cathode and anode) at STP (1 atm and 273 K) is :
JEE Main Online Paper (Held On 10 April 2016)
A)
6.72 L
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B)
2.24 L
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C)
4.48 L
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D)
8.96 L
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question_answer20) If 100 mole of \[{{H}_{2}}{{O}_{2}}\]decompose at 1 bar and 300 K, the work done (kJ) by one mole of\[{{O}_{2}}(g)\] as it expands against 1 bar pressure is : \[2{{H}_{2}}{{O}_{2}}(l)2{{H}_{2}}O(l)+{{O}_{2}}(g)\] \[(R=8.3J\,{{K}^{-1}}mo{{l}^{-1}})\]
JEE Main Online Paper (Held On 10 April 2016)
A)
498.00
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B)
62.25
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C)
124.50
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D)
249.00
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question_answer21) Which of the following is an example of homoleptic complex ?
JEE Main Online Paper (Held On 10 April 2016)
A)
\[[Co{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]\]
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B)
\[[Co{{(N{{H}_{3}})}_{6}}]C{{l}_{3}}\]
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C)
\[[Co{{(N{{H}_{3}})}_{5}}Cl]C{{l}_{2}}\]
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D)
\[[Pt{{(N{{H}_{3}})}_{2}}C{{l}_{2}}]\]
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question_answer22) The bond angle H - X - H is the greatest in the compound :
JEE Main Online Paper (Held On 10 April 2016)
A)
\[N{{H}_{3}}\]
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B)
\[P{{H}_{3}}\]
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C)
\[C{{H}_{4}}\]
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D)
\[{{H}_{2}}O\]
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question_answer23) The rate law for the reaction below is given by the expression k [A][B] \[A+B\to \]Product If the concentration of B is increased from 0.1 to 0.3 mole, keeping the value of A at 0.1 mole, the rate constant will be :
JEE Main Online Paper (Held On 10 April 2016)
A)
9 k
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B)
3 k
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C)
k/3
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D)
k
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question_answer24) Sodium extract is heated with concentrated \[HN{{O}_{3}}\] before testing for halogens because :
JEE Main Online Paper (Held On 10 April 2016)
A)
Ag reacts faster with halides in acidic medium.
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B)
Silver halides are totally insoluble in nitric acid.
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C)
\[A{{g}_{2}}S\]and \[AgCN\] are soluble in acidic medium.
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D)
\[{{S}^{2-}}\]and \[C{{N}^{-}},\]if present, are decomposed by conc. \[HN{{O}_{3}}\]and hence do not interfere in the test.
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question_answer25) Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
JEE Main Online Paper (Held On 10 April 2016)
A)
Nitrogen dioxide
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B)
Sulphur dioxide
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C)
Tetrachloroethylene
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D)
Carbon dioxide
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question_answer26)
Consider the reaction sequence below :
JEE Main Online Paper (Held On 10 April 2016)
A)
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B)
done
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C)
done
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D)
done
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question_answer27) Observation of "Rhumann's purple" is a confirmatory test for the presence of :
JEE Main Online Paper (Held On 10 April 2016)
A)
Reducing sugar
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B)
Starch
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C)
Protein
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D)
Cupric ion
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question_answer28) Aqueous solution of which salt will not contain ions with the electronic configuration \[1{{s}^{2}}2{{s}^{2}}{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\] ?
JEE Main Online Paper (Held On 10 April 2016)
A)
\[NaCl\]
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B)
\[Ca{{I}_{2}}\]
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C)
\[NaF\]
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D)
\[KBr\]
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question_answer29) The volume of 0.1 N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of \[O{{H}^{-}}\] in aqueous solution is :
JEE Main Online Paper (Held On 10 April 2016)
A)
400 mL
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B)
600 mL
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C)
200 mL
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D)
80 mL
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question_answer30) Identify the reaction which does not liberate hydrogen :
JEE Main Online Paper (Held On 10 April 2016)
A)
Allowing a solution of sodium in liquid ammonia to stand.
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B)
Reaction of zinc with aqueous alkali.
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C)
Reaction of lithium hydride with \[{{B}_{2}}{{H}_{6}}.\]
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D)
Electrolysis of acidified water using Pt electrodes.
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