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JEE Advanced 2019 Chemistry Questions Paper 1

JEE Advanced 2019 Chemistry Paper 1 solutions are available here. All questions are solved by subject experts and in a detailed manner. Students can also download the solved paper in a PDF format for offline practice to improve their speed and accuracy. Practising JEE Advanced 2019 Chemistry question Paper 1 will help the aspirants to understand the overall exam pattern and prepare accordingly for upcoming exam.
Paper 1 – Chemistry

1. Which of the following set represent correct formula for Malachite, Magnetite, Calamine & Cryolite?


a) CuCO3, Fe2O3, ZnO, Al2O3
b) CuCO3,Cu(OH), Fe3O4, ZnCO3, Na3 AlF6
c) CuCO3, Fe3O4, ZnCO3, Al2O3
d) CuCO3.Cu(OH), Fe2O3, ZnCO3, Na3AlF6

Malachite → CuCO3.Cu(OH)2

Magnetite → Fe3O4

Calamine → ZnCO3

Cryollite → Na3AlF6

Answer: (b)

2.The correct order of acid strength of the following carboxylic acids is

JEE Advanced Chemistry 2019 Paper


Answer is (1)

JEE Advanced Chemistry 2019 Paper

3. Sodium stearate is a strong electrolyte. Which of the following plot is correct regarding its conductance:
JEE Advanced Chemistry 2019 Paper 1

By definition, λmα (1/√C)

Answer: (b)

4. Which green coloured compound of chromium is formed in borax bead test?
a) Cr(BO2)3
b) Cr2O3
c) CrB
d) CrBO3
JEE Advanced Chemistry 2019 Solved Paper 1

Answer: (a)

5. Choose the reaction, for which the standard enthalpy of reaction is equal to the standard enthalpy of formation:
JEE Advanced Chemistry 2019 Paper Solution 5

By definition,

Enthalpy of formation is defined as the Enthalpy change occurring when, a compound is formed from its constituent elements in standard state.

Answer: (B, C)

6. A Tin-chloride ‘P’ gives following reaction (unbalanced reaction)

P + Cl

\(\begin{array}{l}\rightarrow\end{array} \)
X [Monoanion pyramidal geometry]

P + Me3N

\(\begin{array}{l}\rightarrow\end{array} \)
Y

P + CuCl2

\(\begin{array}{l}\rightarrow\end{array} \)
Z + CuCl

Then which of the following is/are correct.


a) Y contains co-ordinate bond
b) X is sp3 hybridised.
c) Oxidation state of Sn is X is +1.
d) X contain lone pair on central atom.
JEE Advanced Chemistry 2019 Paper Solution 6

Answer: (a, b, d)

7.
\(\begin{array}{l}^{238}_{92}U \overset{x_1}{\rightarrow}^{234}_{90}Th \overset{x_2}{\rightarrow}^{234}_{91}Pa \overset{x_3}{\rightarrow}^{234}Z\overset{x_4}{\rightarrow}^{230}_{90}Th\end{array} \)
x1, x2, x3, x4 are either particles or radiation. Then

a) x1 is deflected toward negatively charged plate.
b) x2 is β-particle.
c) x3 is γ-radiation.
d) z is isotope of 238U

x1 -> α – decay

x2 -> β – decay

x3 -> β – decay

x4 -> α – decay

Answer: (a, b, d)

8. Fusion of MnO2 along with KOH and O2 forms X. Electrolytic oxidation of X yields Y. X undergoes disproportionation reaction in acidic medium to MnO2 and Y. The Manganese in X and Y is in the form W & Z respectively, then
a) W & Z are coloured
b) W is diamagnetic and Z is paramagnetic
c) Both W & Z are tetrahedral in shape
d) Both W & Z involve pπ-dπ bonding for π bond
JEE Advanced Chemistry 2019 Paper Solution 8

Answer: (a, c, d)

9. Choose the corection option for the following reaction

JEE Advanced Chemistry 2019 Paper Solution 9


JEE Advanced Solved Sample Paper 2019

Answer: (1, 4)

10. Which of the following are true.
a) Monosachharides can not be hydrolysed to give polyhydroxy aldehydes and ketones.
b) Hydrolysis of sucrose gives dextrorotatory glucose and laevorotatory fructose
c) Oxidation of glucose with bromine water gives glutamic acid.
d) The two six membered hemiacetal form of D(+) glucose are anomers.

Answer is: (a, b, d)

11. Identify the option where all four molecules possess permanent dipole moment at room temperature.
a) BF, O3, SF6, XeF6
b) BeCl2, CO2, BCl3, CHCl3
c) SO2, C6H5Cl, H2Se, BrF5
d) NO2, NH3, POCl3, CH3Cl

For Option c

JEE Advanced Solved Chemistry 2019 Paper 1

Answer: (c, d)

12. Which of the following is/are correct regarding root mean square speed (Urms) & average translation K.E. (Eav) of molecule in a gas at equilibrium.
a) Eav is doubled when its temperature is increased 4 times
b) Urms is inversely proportional to the square root of its molecular mass
c) Eav at a given temperature doesn’t depend on its molecular mass
d) Urms is doubled when its temperature is increased 4 times

Eav = (3/2)RT [independent of mass)

urms =

\(\begin{array}{l}\sqrt{\frac{3RT}{M}}\end{array} \)

Answer: (b, c, d)

13. XeF4 + O2F2
\(\begin{array}{l}\rightarrow\end{array} \)
product. The total number of lone pairs on the xenon containing product is: (l)

19
JEE Advanced Chemistry Paper 1 in 2019

Distorted octahedral shape.

14. For the following reaction, equilibrium constant Kc at 298 K is 1.6 × 1017.

\(\begin{array}{l}Fe^{2+}_{(aq)} + S^{2-}_{(aq)} \rightleftharpoons FeS \ (s)\end{array} \)

When equal volume of 0.06 M Fe+2 and 0.2 M S-2 solution are mixed, then equilibrium concentration of Fe+2 is found to be Y × 10-17 M. Y is:

\(\begin{array}{l}Fe^{2+} + S^{2-} \rightarrow FeS \end{array} \)

Ini

0.06

0.2

0

After mix

0.03

0.1

At 0 q/m

x

0.07

JEE Advanced Chemistry 2019 Paper Solution 14

15.Schemes 1 and 2 describe the conversion of P to Q and R to S, respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is _____

Solved JEE Advanced Chemistry 2019 Paper 1


Solved Paper 1 for JEE Advanced Chemistry 2019

Total Br atoms = 4

16. Which of the following compounds contain bond between same type of atoms.

N2O4, B3 N3H6, H2S2O3, N2O, H2S2O8, B2H6
JEE Advanced Chemistry 2019 Paper Solution 16

Answer: N2O4, H2S2O3, N2O, H2S2O8

17. Consider the kinetic data given in the following table for the reaction A + B + C → Product

JEE Advanced Chemistry 2019 Paper Solution 17

When [A] = 0.15

[B] = 0.25

[C] = 0.15

Rate of reaction is Y × 10-5 m/s. Find Y.


Let

\(\begin{array}{l}r = K[A]^x[B]^y[C]^z\end{array} \)

From (1), (2) -> y = 0

(1), (3) -> z = 1

(1), (4) -> x = 1

Therefore, rate law becomes

\(\begin{array}{l}r = K[A]^1[B]^0[C]^1\end{array} \)

From (2)

K = 3 x 10-3

When [A] = 0.15, [B] = 0.25, [C] = 0.15

r = 3 x 10-3 [0.15]1 [0.15]1

= 6.75 x 10-5 moll-1 s-1

So, y x 10-6

Hence, y = 6.75

Answer: (6.75)

18. On dissolving 0.5 g of non-volatile, non-ionic solute to 39 g of benzene, its vapour pressure decreases from 650 mm of Hg to 640 mm of Hg. The depression of freezing point of benzene (in K) upon addition of the solute is __________________.

[Given data: Molar mass & molar freezing point depression of benzene is 78 g mol-1 & 5.12 K Kg mol-1]


\(\begin{array}{l}\frac{P^0 – P_S}{P_S} = \frac{n_{solute}}{n_{solvant}}\end{array} \)
\(\begin{array}{l}\frac{650 – 640}{640} – \frac{1 \times 0.58 \times 78}{M \times 39}\end{array} \)

Therefore, M = 64 g

Solved Paper 1 for JEE Advanced Chemistry 2019

Video Lessons – Paper 1 Chemistry

JEE Advanced 2019 Chemistry Paper 1 Solutions

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