JEE MAIN - Chemistry (2017 - 9th April Morning Slot)
1
The increasing order of the boiling points for the following compounds is :
Answer
(A)
(III) < (IV) < (II) < (I)
2
Among the following compounds, the increasing order of their basic strength is :
Answer
(C)
(II) < (I) < (IV) < (III)
3
Which of the following compounds will show highest dipole moment ?
Answer
(A)
(I)
4
In the following reaction sequence :
The compound I is :
Answer
(D)
5
The major product of the following reaction is :
Answer
(B)
6
In the following structure, the double bonds are marked as I, II, III and IV
Geometrical isomerism is not possible at site (s) :
Answer
(B)
I
7
Which of the following compounds is most reactive to an aqueous solution of sodium
carbonate ?
Answer
(C)
8
[Co2(CO)8] displays :
Answer
(A)
one Co−Co bond, six terminal CO and two bridging CO
9
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
Answer
(D)
Mn2+
10
The incorrect statement among the following is :
Answer
(B)
$$\alpha $$-D-glucose and $$\beta $$-D-glucose are enantiomers.
11
A compound of molecular formula C8H8O2
reacts with acetophenone to form a single cross-aldol product in the presence
of base. The same compound on reaction with conc. NaOH forms benzyl alcohol as
one of the products. The structure of the compound is :
Answer
(A)
12
The group having triangular planar structures is :
Answer
(B)
$$CO_3^{2 - }$$, $$NO_3^ - $$, SO3
13
To find the standard potential of M3+/M electrode,the following cell is constituted : Pt/M/M3+(0.001 mol L−1 )/Ag+(0.01 mol L−1 )/Ag
The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction M3+ + 3e−$$ \to $$ M at 298 K will be :
(Given $$E_{A{g^ + }\,/\,Ag}^ - $$ at 298 K = 0.80 Volt)
Answer
(B)
0.32 Volt
14
Which one of the following is an oxide?
Answer
(C)
SiO2
15
The following reaction occurs in the Blast Furnace where iron ore is reduced to iron
metal :
Using the Le Chatelier’s principle, predict which one of the following will not disturb the equilibrium ?
Answer
(D)
Addition of Fe2O3
16
The electronic configuration with the highest ionization enthalpy is :
Answer
(C)
[Ne] 3s2 3p3
17
The rate of a reaction quadruples when the temperature changes from 300 to 310 K. The activation energy of this reaction is :
(Assume activation energy and preexponential factor are independent of
temperature; ln 2 = 0.693; R = 8.314 J mol−1 K−1)
Answer
(A)
107.2 kJ mol$$-$$1
18
A solution is prepared by mixing 8.5 g of CH2Cl2 and 11.95 g of CHCl3 . If vapour pressure of CH2Cl2
and CHCl3 at 298 K are 415 and 200 mmHg respectively, the mole fraction of CHCl3 in vapour form is : (Molar mass of Cl = 35.5 g mol−1)
Answer
(C)
0.325
19
A gas undergoes change from state A to state B. In this process, the heat absorbed
and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to
A by another process during which 3 J of heat is evolved. In this reverse process of
B to A :
Answer
(D)
6 J of the work will be done by the surrounding on gas.
20
What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must
be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid
solution ?
Answer
(C)
316
21
The electron in the hydrogen atom undergoes transition from higher orbitals
to orbital of radius 211.6 pm. This transition is associated with :
Answer
(B)
Balmer series
22
50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be :
Answer
(D)
9.25
23
An ideal gas undergoes isothermal expansion at constant pressure. During
the process :
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