JEE MAIN - Chemistry (2023 - 29th January Evening Shift)
1
Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled.
In the light of the above statements, choose the most appropriate answer from the options given below
Answer
(C)
Both the statements I and II are correct
2
Given below are two statements :
Statement I : Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement II : Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements, choose the most appropriate answer from the options given below :
Answer
(A)
Statement I is correct but statement II is incorrect
3
Which of the following relations are correct?
(A) $$\mathrm{\Delta U=q+p\Delta V}$$
(B) $$\mathrm{\Delta G=\Delta H-T\Delta S}$$
(C) $$\Delta \mathrm{S}=\frac{q_{rev}}{T}$$
(D) $$\mathrm{\Delta H=\Delta U-\Delta nRT}$$
Choose the most appropriate answer from the options given below :
Answer
(B)
B and C only
4
A solution of $$\mathrm{Cr O_5}$$ in amyl alcohol has a __________ colour.
Answer
(D)
Blue
5
According to MO theory the bond orders for $$\mathrm{O}$$$$_2^{2 - }$$, $$\mathrm{CO}$$ and $$\mathrm{NO^+}$$ respectively, are
Answer
(A)
1, 3 and 3
6
When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?
Answer
(C)
$$\mathrm{C_8H_6}$$
7
The set of correct statements is :
(i) Manganese exhibits +7 oxidation state in its oxide.
(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.
(iii) Sc shows +4 oxidation state which is oxidizing in nature.
(iv) Cr shows oxidising nature in +6 oxidation state.
Answer
(D)
(i), (ii) and (iv)
8
Correct order of spin only magnetic moment of the following complex ions is :
Solutions with same composition of vapour above it
Choose the correct answer from the options given below :
Answer
(B)
A-III, B-I, C-II, D-IV
12
The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement)
Answer
(D)
2-Bromopentane
13
An indicator 'X' is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with $$\mathrm{H_2O_2}$$ at room temp. The indicator 'X' forms blue coloured complex with compound 'A' present in the solution. The indicator 'X' and compound 'A' respectively are :
Answer
(D)
Starch and iodine
14
Find out the major product for the following reaction.
Answer
(C)
15
Find out the major products from the following reaction sequence.
Answer
(B)
16
The volume of HCl, containing 73 g L$$^{-1}$$, required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is __________ mL. (Nearest Integer)
(Given : molar masses of Na, Cl, O, H, are 23, 35.5, 16 and 1 g mol$$^{-1}$$ respectively.)
Answer
15
17
The equilibrium constant for the reaction
$$\mathrm{Zn(s)+Sn^{2+}(aq)}$$ $$\rightleftharpoons$$ $$\mathrm{Zn^{2+}(aq)+Sn(s)}$$ is $$1\times10^{20}$$ at 298 K. The magnitude of standard electrode potential of $$\mathrm{Sn/Sn^{2+}}$$ if $$\mathrm{E_{Z{n^{2 + }}/Zn}^\Theta = - 0.76~V}$$ is __________ $$\times 10^{-2}$$ V. (Nearest integer)
Based on above equilibria, then equilibrium constant of the reaction, $$\mathrm{2NH_3(g)+\frac{5}{2}O_2~(g)\rightleftharpoons~2NO~(g)+3H_2O~(g)}$$ is ____________ $$\times10^{-33}$$ (Nearest integer).
Answer
4
19
The denticity of the ligand present in the Fehling's reagent is ___________.
Answer
4
20
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO$$_2$$ was produced. The molar mass of compound is _____________ g mol$$^{-1}$$ (Nearest integer).
Answer
200
21
Total number of acidic oxides among
$$\mathrm{N_2O_3,NO_2,N_2O,Cl_2O_7,SO_2,CO,CaO,Na_2O}$$ and $$\mathrm{NO}$$ is ____________.
Answer
4
22
Assume that the radius of the first Bohr orbit of hydrogen atom is 0.6 $$\mathrm{\mathop A\limits^o }$$. The radius of the third Bohr orbit of He$$^+$$ is __________ picometer. (Nearest Integer)
Answer
270
23
For conversion of compound A $$\to$$ B, the rate constant of the reaction was found to be $$\mathrm{4.6\times10^{-5}~L~mol^{-1}~s^{-1}}$$. The order of the reaction is ____________.