JEE MAIN - Chemistry (2017 - 8th April Morning Slot)
1
The major product of the following reaction is :
Answer
(B)
2
The IUPAC name of the following compound is :
Answer
(B)
2-Ethyl-1, 1-dimethylcyclohexane
3
The major product of the following reaction is :
Answer
(A)
4
The major product expected from the following reaction is :
Answer
(C)
5
Which of the following compounds will not undergo Friedel Craft’s reaction with benzene ?
Answer
(B)
6
A solution containing a group-IV cation gives a precipitate on passing H2S. A solution of this precipitate in dil.HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :
Answer
(D)
Zn2+
7
Among the following, the essential amino acid is :
Answer
(B)
Valine
8
Which of the following statements is not true about partition chromatography?
Answer
(B)
Stationary phase is a finely divided solid adsorbent
9
A mixture containing the following four compounds is extracted with $$1M$$ $$HCl.$$ The compound that goes to aqueous layer is :
Answer
(B)
(II)
10
A metal ‘M’ reacts with nitrogen gas to afford ‘M3N’. ‘M3N’ on heating at high temperature gives back ‘M’ and on
reaction with water produces a gas ‘B’. Gas ‘B’ reacts with aqueous
solution of CuSO4 to form a deep blue compound. ‘M’ and
‘B’ respectively are :
Answer
(A)
Li and NH3
11
Consider the following standard electrode potentials (Eo in volts) in aqueous solution :
Element
M3+ /M
M+ /M
A1
-1.66
+ 0.55
T1
+1.26
- 0.34
Based on these data, which of the following statements is correct ?
Answer
(C)
T1 + is more stable than A1+
12
The major product of the following reaction is :
Answer
(D)
CH3CH = CH − CH = CHCH3
13
Consider the following ionization enthalpies of two elements 'A' and 'B' .
Element
Ionization enthalpy (kJ/mol)
1st
2nd
3rd
A
899
1757
14847
B
737
1450
7731
Which of the following statements is correct ?
Answer
(C)
Both ‘A’ and ‘B’ belong to group-2 where ‘B’ comes below ‘A’.
14
If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He+ is :
Answer
(D)
$${{36A} \over 7}$$
15
sp3d2 hybridization is not displayed by :
Answer
(D)
PF5
16
The pair of compounds having metals in their highest oxidation state is :
Answer
(A)
MnO2 and CrO2Cl2
17
Which of the following is paramagnetic ?
Answer
(D)
B2
18
The enthalpy change on freezing of 1 mol of water at 5oC to ice at −5oC is :
The rate of a reaction A doubles on increasing the temperature from 300 to 310 K. By how much, the temperature of reaction B should be Increased from 300 K so that rate doubles if activation energy of the reaction B is twice to that of reaction A.
Answer
(B)
4.92 K
20
Additin of sodium hydroxide solution to a weak acid (HA)results in a buffer of pH 6. If ionition constant of HA is 10$$-$$5, the ratio of salt to acid concentration in the buffer solution will be :
Answer
(C)
10 : 1
21
5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be
3.82oC. If Na2SO4 is 81.5% ionised,
the value of x
(Kf for water=1.86oC kg mol−1) is approximately :
(molar mass of S = 32 g mol−1 and that of Na = 23 g mol−1)
Answer
(C)
45 g
22
What is the standard reduction potential (Eo) for Fe3+ $$ \to $$ Fe ?
Given that :
Fe2+ + 2e$$-$$ $$ \to $$ Fe; $$E_{F{e^{2 + }}/Fe}^o$$ = $$-$$0.47 V
Fe3+ + e$$-$$ $$ \to $$ Fe2+; $$E_{F{e^{3 + }}/F{e^{2 + }}}^o$$ = +0.77 V
Answer
(A)
$$-$$ 0.057 V
23
For a reaction, A(g) $$ \to $$ A($$\ell $$); $$\Delta $$H= $$-$$ 3RT.
The correct statement for the reaction is :
_8th_April_Morning_Slot_en_1_1.png)
_8th_April_Morning_Slot_en_1_3.png)
_8th_April_Morning_Slot_en_2_1.png)
_8th_April_Morning_Slot_en_3_1.png)
_8th_April_Morning_Slot_en_3_2.png)
_8th_April_Morning_Slot_en_4_1.png)
_8th_April_Morning_Slot_en_4_4.png)
_8th_April_Morning_Slot_en_5_2.png)
_8th_April_Morning_Slot_en_9_1.png)
_8th_April_Morning_Slot_en_12_1.png)
