JEE MAIN - Chemistry (2018 - 16th April Morning Slot)
1
The major product of the following reaction is :
Answer
(A)
2
Products A and B formed in the following reactions are respectively :
Answer
(D)
3
In a complexometric titration of metal ion with ligand
M(Metal ion) + L(Ligand) $$ \to $$ C(Complex) end point is estimated spectrophoto - metrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light (A) versus volume of ligand 'L' (V) would look like :
Answer
(B)
4
The major product B formed in the following reaction sequence is :
Answer
(B)
5
The most polar compound among the following is :
Answer
(A)
6
The major product of the following reaction is :
Answer
(A)
7
The major product of the following reaction is :
Answer
(A)
8
If 50% of a reaction occurs in 100 second and 75% of the reaction occurs in 200 secod, the order of this reaction is :
Answer
(B)
1
9
For which of the following processes, $$\Delta $$S is negative ?
Answer
(B)
N2(g, 1 atm) $$ \to $$ N2(g, 5 atm)
10
When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is :
Answer
(A)
9.81 g
11
An unknown chlorohydrocarbon has 3.55% of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :
(Atomic wt. of Cl = 35.5 u; Avogadro constant = 6.023 $$ \times $$ 1023 mol-1)
Answer
(A)
6.023 $$ \times $$ 1020
12
The gas phase reaction 2NO2(g) $$ \to $$ N2O4(g) is an exothermic reaction. The decomposition of N2O4, in equilibrium mixture of NO2(g) and N2O4(g), can be increased by :
Answer
(D)
addition of an inert gas at constant pressure.
13
Among the following, the incorrect statement is :
Answer
(B)
Sucrose and amylose has 1, 2 - glycosidic linkage
14
The incorrect geometry is represented by :
Answer
(C)
NF3 - trigonal planar
15
Which of the following compounds will most readily be dehydrated to give alkene under acidic condition ?
Answer
(B)
4-Hydroxypentan - 2-one
16
For standardizing NaOH solution, which of the following is used as a primary standard ?
Answer
(C)
Oxalic acid
17
When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3 ; a dark green product is formed which disproportioates in acidic solution to afforda dark purple solution. X is :
Answer
(D)
Mn
18
Which of the following complexes will shows geometrical isomerism ?
Answer
(A)
aquachlorobis (ethylenediamine) cobalt (II) chloride
19
Which of the following conversions involves change in both shape and hybridisation ?
Answer
(D)
BF3 $$ \to $$ BF4$$-$$
20
In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively :
Answer
(C)
dsp2, square planar
21
The mass of a non-volatile, non-electrolyte solute (molar mass = 50 g mol-1 ) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is :
Answer
(C)
150 g
22
The incorrect statement is :
Answer
(B)
Cu2+ and Ni2+ ions give black precipitate with H2S in presence of HCl solution.
23
At 320 K, a gas A2 is 20% dissociated to A(g). The standard free energy change at 320 K and 1 atm in J mol-1 is approximately : (R = 8.314 JK-1 mol-1; ln2 = 0.693; ln 3 = 1.098)
Answer
(D)
4281
24
Which of the following statements is false ?
Answer
(D)
Frequency of emitted radiation from a black body goes from a lower wavelength to higher wavelength as the temperature increases.
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