Other Chemistry · JEE Main previous year questions

The correct order of reduction potentials of the following pairs is A. $\mathrm{C}{\mathrm{l}}_2/C{\mathrm{l}}^{-}$ B. ${\mathrm{I}}_2/{\mathrm{I}}^{-}$ C. $\mathrm{A}{\mathrm{g}}^{+}/Ag$ D. $\mathrm{N}{\mathrm{a}}^{+}/Na$ E. $\mathrm{L}{\mathrm{i}}^{+}/Li$ Choose the correct answer from the options given below.

1. A.$\mathrm{A}>\mathrm{C}>\mathrm{B}>\mathrm{D}>\mathrm{E}$
2. B.$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}>\mathrm{E}$
3. C.$\mathrm{A}>\mathrm{C}>\mathrm{B}>\mathrm{E}>\mathrm{D}$
4. D.$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{E}>\mathrm{D}$

1. A.benzyl bromide
2. B.bromobenzene
3. C.cyclohexyl bromide
4. D.methyl bromide

Match List I with List II $$\begin{array}{llll}& \text{List - I}& & \text{List -II}\\ \text{A.}& \text{Zymase}& \text{I.}& \text{Stomach}\\ \text{B.}& \text{Diastase}& \text{II.}& \text{Yeast}\\ \text{C.}& \text{Urease}& \text{III.}& \text{Malt}\\ \text{D.}& \text{Pepsin}& \text{IV.}& \text{Soyabean}\end{array}$$ Choose the correct answer from the options given below :

1. A.A-II, B-III, C-I, D-IV
2. B.A-II, B-III, C-IV, D-I
3. C.A-III, B-II, C-IV, D-I
4. D.A-III, B-II, C-I, D-IV

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be :

1. A.Hg
2. B.Ag
3. C.Ga
4. D.Cs

Which of the following chemical reactions represents Hall-Heroult Process?

1. A.${\mathrm{Cr}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Cr}$
2. B.$2{\mathrm{Al}}_2{\mathrm{O}}_3+3\mathrm{C}\to 4\mathrm{Al}+3{\mathrm{CO}}_2$
3. C.$\mathrm{FeO}+\mathrm{CO}\to \mathrm{Fe}+{\mathrm{CO}}_2$
4. D.$2[\mathrm{Au}(\mathrm{CN}{)}_2{]}_{(aq)}^{-}+\mathrm{Zn}(s)\to 2\mathrm{Au}(s)+[\mathrm{Zn}(\mathrm{CN}{)}_4{]}^{2-}$

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

1. A.$\mathrm{NaOH}$
2. B.$\mathrm{NaCl}$
3. C.$\mathrm{Na}\text{ metal}$
4. D.${\mathrm{Na}}_2{\mathrm{CO}}_3$

Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

1. A.Baking soda
2. B.Soda ash
3. C.Washing soda
4. D.Caustic soda

At $300\text{ K}$, a sample of $3.0\text{ g}$ of gas A occupies the same volume as $0.2\text{ g}$ of hydrogen at $200\text{ K}$ at the same pressure. The molar mass of gas A is $\underline{}{\text{ g mol}}^{-1}$. (nearest integer) Assume that the behaviour of gases as ideal. (Given : The molar mass of hydrogen (${\mathrm{H}}_2$) gas is $2.0{\text{ g mol}}^{-1}$.)

For the reaction, $2\mathrm{N}{\mathrm{O}}_2(\mathrm{g})\rightleftharpoons {\mathrm{N}}_2{\mathrm{O}}_4(\mathrm{g})$, when $\Delta \mathrm{S}=-176.0\mathrm{J}{\mathrm{K}}^{-1}$ and $\Delta \mathrm{H}=-57.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$, the magnitude of $\Delta \mathrm{G}$ at $298\mathrm{K}$ for the reaction is ____ $\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$. (Nearest integer)

The interaction energy of London forces between two particles is proportional to $r^x$, where r is the distance between the particles. The value of x is :

1. A.$3$
2. B.$-3$
3. C.$-6$
4. D.$6$

Chalcogen group elements are :

1. A.Se, Tb and Pu.
2. B.Se, Te and Po.
3. C.S, Te and Pm.
4. D.O, Ti and Po.

$$R-CN\underset{(ii)H_{2}O}{\overset{(i)DIBAL-H}{\to }}R-Y$$ Consider the above reaction and identify "Y"

1. A.$-\mathrm{C}{\mathrm{H}}_2\mathrm{N}{\mathrm{H}}_2$
2. B.$-\mathrm{CON}{\mathrm{H}}_2$
3. C.$-\mathrm{CHO}$
4. D.$-\mathrm{COOH}$

1. A.The reaction is not possible in acidic medium
2. B.Both compounds A and B are formed equally
3. C.Compound A will be the major product
4. D.Compound B will be the major product

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :

1. A.1 and 1
2. B.3 and 1
3. C.2 and 1
4. D.2 and 2

If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been :

1. A.All of the $\alpha$-particles pass through the gold foil without decrease in speed.
2. B.$\alpha$-particles are deflected over a wide range of angles.
3. C.All $\alpha$-particles get bounced back by $180^{\circ }$
4. D.$\alpha$-particles pass through the gold foil deflected by small angles and with reduced speed.

Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are :

1. A.3, 1 and 1
2. B.4, 1 and 0
3. C.1, 1 and 3
4. D.1, 2 and 3

When 400 mL of 0.2 M ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ solution is mixed with 600 mL of 0.1 M $\mathrm{NaOH}$ solution, the increase in temperature of the final solution is __________ $\times 10^{-2}\text{ K}$. (Round off to the nearest integer). [Use : ${\mathrm{H}}^{+}(\mathrm{aq})+\mathrm{O}{\mathrm{H}}^{-}(\mathrm{aq})\to {\mathrm{H}}_2\mathrm{O}:{\mathrm{\Delta }}_{\mathrm{r}}\mathrm{H}=-57.1\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$] Specific heat of ${\mathrm{H}}_2\mathrm{O}=4.18\mathrm{J}{\mathrm{K}}^{-1}{\mathrm{g}}^{-1}$ density of ${\mathrm{H}}_2\mathrm{O}=1.0\mathrm{g}\mathrm{c}{\mathrm{m}}^{-3}$ Assume no change in volume of solution on mixing.

The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)

Which one of the following compounds of Group-14 elements is not known?

1. A.$[\mathrm{GeC}{\mathrm{l}}_6{]}^{2-}$
2. B.$[\mathrm{Sn}(\mathrm{OH}{)}_6{]}^{2-}$
3. C.$[\mathrm{SiC}{\mathrm{l}}_6{]}^{2-}$
4. D.$[\mathrm{Si}{\mathrm{F}}_6{]}^{2-}$

1. A.
2. B.
3. C.
4. D.

Which one of the following compounds will liberate $\mathrm{C}{\mathrm{O}}_2$, when treated with $\mathrm{NaHC}{\mathrm{O}}_3$ ?

1. A.$(\mathrm{C}{\mathrm{H}}_3{)}_3\stackrel{\oplus }{\mathrm{N}}\mathrm{H}\stackrel{\ominus }{\mathrm{Cl}}$
2. B.$(\mathrm{C}{\mathrm{H}}_3{)}_4\stackrel{\oplus }{\mathrm{N}}\stackrel{\ominus }{\mathrm{O}}\mathrm{H}$
3. C.$\mathrm{C}{\mathrm{H}}_3-\stackrel{\mathrm{O}}{\stackrel{\Vert }{\mathrm{C}}}-\mathrm{N}{\mathrm{H}}_2$
4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{N}{\mathrm{H}}_2$

1. A.Novolac
2. B.Buna-N
3. C.Acrilan
4. D.Neoprene

Which one of the following chemical agent is not being used for dry-cleaning of clothes?

1. A.${\mathrm{H}}_2{\mathrm{O}}_2$
2. B.$\mathrm{CC}{\mathrm{l}}_4$
3. C.Liquid $\mathrm{C}{\mathrm{O}}_2$
4. D.$\mathrm{C}{\mathrm{l}}_2\mathrm{C}=\mathrm{CC}{\mathrm{l}}_2$

Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ____ $\times 10^{-1}$ g. (in nearest integer)

The correct decreasing order of densities of the following compounds is : (A) [structure: benzene] (B) [structure: chlorobenzene] (C) [structure: 1,3-dichlorobenzene] (D) [structure: 1-bromo-3-chlorobenzene]

1. A.(D) > (C) > (B) > (A)
2. B.(C) > (D) > (A) > (B)
3. C.(C) > (B) > (A) > (D)
4. D.(A) > (B) > (C) > (D)