Other Chemistry · JEE Main previous year questions

Among the following, correct statement is :

1. A.Brownian movement is more pronounced for smaller particles than for bigger particles
2. B.Sols of metal sulphides are lyophilic.
3. C.Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
4. D.One would expect charcoal to adsorb chlorine more than hydrogen sulphide.

Among the following, the incorrect statement is :

1. A.At low pressure, real gases show ideal behaviour.
2. B.At very low temperature, real gases show ideal behaviour.
3. C.At very large volume, real gases show ideal behaviour.
4. D.At Boyle’s temperature, real gases show ideal behaviour.

The number of S = O and S − OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :

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

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / $\lambda$ (where $\lambda$ is wavelength associated with electron wave) is given by :

1. A.$2meV$
2. B.$\sqrt{meV}$
3. C.$\sqrt{2meV}$
4. D.$meV$

Galvanization is applying a coating of :

1. A.Cr
2. B.Cu
3. C.Zn
4. D.Pb

Which of the following compounds is metallic and ferromagnetic ?

1. A.$\mathrm{Cr}{\mathrm{O}}_2$
2. B.$\mathrm{V}{\mathrm{O}}_2$
3. C.$\mathrm{Mn}{\mathrm{O}}_2$
4. D.$\mathrm{Ti}{\mathrm{O}}_2$

Thiol group is present in :

1. A.Cytosine
2. B.Cystine
3. C.Cysteine
4. D.Methionine

1. A.$(2S,3S)$
2. B.$(2R,3R)$
3. C.$(2R,3S)$
4. D.$(2S,3R)$

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

Which one of the following statements about water is FALSE?

1. A.Water is oxidized to oxygen during photosynthesis
2. B.Water can act both as an acid and as a base.
3. C.There is extensive intramolecular hydrogen bonding in the condensed phase.
4. D.Ice formed by heavy water sinks in normal water

The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :

1. A.$\mathrm{Li}{\mathrm{O}}_2$, $\mathrm{N}{\mathrm{a}}_2{\mathrm{O}}_2$ and ${\mathrm{K}}_2\mathrm{O}$
2. B.$\mathrm{L}{\mathrm{i}}_2{\mathrm{O}}_2$, $\mathrm{N}{\mathrm{a}}_2{\mathrm{O}}_2$ and $\mathrm{K}{\mathrm{O}}_2$
3. C.$\mathrm{L}{\mathrm{i}}_2\mathrm{O}$, $\mathrm{N}{\mathrm{a}}_2{\mathrm{O}}_2$ and $\mathrm{K}{\mathrm{O}}_2$
4. D.$\mathrm{L}{\mathrm{i}}_2\mathrm{O}$, $\mathrm{N}{\mathrm{a}}_2\mathrm{O}$ and $\mathrm{K}{\mathrm{O}}_2$

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

Which of the following is the energy of a possible excited state of hydrogen?

1. A.–6.8 eV
2. B.–3.4 eV
3. C.+6.8 eV
4. D.+13.6 eV

The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is:

1. A.ion-dipole interaction
2. B.London force
3. C.hydrogen bond
4. D.ion-ion interaction

Higher order (>3) reactions are rare due to

1. A.increase in entropy and activation energy as more molecules are involved
2. B.shifting of equilibrium towards reactants due to elastic collisions
3. C.loss of active species on collision
4. D.low probability of simultaneous collision of all the reacting species

The colour of $\mathrm{KMn}{\mathrm{O}}_4$ is due to :

1. A.$\mathrm{d}-\mathrm{d}\mathrm{transition}$
2. B.$\mathrm{L}\to \mathrm{M}\mathrm{charge}\mathrm{transfer}\mathrm{transition}$
3. C.$\sigma -{\sigma }^{\ast }\mathrm{transition}$
4. D.$\mathrm{M}\to \mathrm{L}\mathrm{charge}\mathrm{transfer}\mathrm{transition}$

From the following statements regarding ${\mathrm{H}}_2{\mathrm{O}}_2$, choose the incorrect statement :

1. A.It decomposes on exposure to light
2. B.It has to be stored in plastic or wax lined glass bottles in dark
3. C.It has to be kept away from dust
4. D.It can act only as an oxidizing agent

Which among the following is the most reactive?

1. A.$\mathrm{B}{\mathrm{r}}_2$
2. B.${\mathrm{I}}_2$
3. C.$\mathrm{ICl}$
4. D.$\mathrm{C}{\mathrm{l}}_2$

Consider separate solutions of $0.500\mathrm{M}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}(\mathrm{aq})$, $0.100\mathrm{M}\mathrm{M}{\mathrm{g}}_3(\mathrm{P}{\mathrm{O}}_4{)}_2(\mathrm{aq})$, $0.250\mathrm{M}\mathrm{KBr}(\mathrm{aq})$ and $0.125\mathrm{M}\mathrm{N}{\mathrm{a}}_3\mathrm{P}{\mathrm{O}}_4(\mathrm{aq})$ at $25^{\circ }\mathrm{C}$. Which statement is true about these solutions, assuming all salts to be strong electrolytes?

1. A.$0.125\mathrm{M}\mathrm{N}{\mathrm{a}}_3\mathrm{P}{\mathrm{O}}_4(\mathrm{aq})$ has the highest osmotic pressure.
2. B.$0.500\mathrm{M}{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}(\mathrm{aq})$ has the highest osmotic pressure
3. C.They all have the same osmotic pressure
4. D.$0.100\mathrm{M}\mathrm{M}{\mathrm{g}}_3(\mathrm{P}{\mathrm{O}}_4{)}_2(\mathrm{aq})$ has the highest osmotic pressure.

Which one of the following properties is not shown by NO?

1. A.It combines with oxygen to form nitrogen dioxide
2. B.It’s bond order is 2.5
3. C.It is diamagnetic in gaseous state
4. D.It is a neutral oxide

The correct statement for the molecule, $\mathrm{Cs}{\mathrm{I}}_3$ is :

1. A.it contains $\mathrm{C}{\mathrm{s}}^{3+}$ and ${\mathrm{I}}^{-}$ ions.
2. B.it contains $\mathrm{C}{\mathrm{s}}^{+}$, ${\mathrm{I}}^{-}$ and lattice ${\mathrm{I}}_2$ molecule.
3. C.it is a covalent molecule
4. D.it contains $\mathrm{C}{\mathrm{s}}^{+}$ and ${\mathrm{I}}_3^{-}$ ions

The equation which is balanced and represents the correct product(s) is :

1. A.$[\mathrm{Mg}({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}+(\mathrm{EDTA}{)}^{4-}\stackrel{\mathrm{excess}\mathrm{NaOH}}{\to }[\mathrm{Mg}(\mathrm{EDTA}){]}^{2+}+6{\mathrm{H}}_2\mathrm{O}$
2. B.$\mathrm{CuS}{\mathrm{O}}_4+\mathrm{KCN}\to {\mathrm{K}}_2[\mathrm{Cu}(\mathrm{CN}{)}_4]+{\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4$
3. C.$\mathrm{L}{\mathrm{i}}_2\mathrm{O}+2KCl\to 2LiCl+{\mathrm{K}}_2\mathrm{O}$
4. D.$[\mathrm{CoCl}(\mathrm{N}{\mathrm{H}}_3{)}_5{]}^{+}+5{\mathrm{H}}^{+}\to \mathrm{C}{\mathrm{o}}^{2+}+5N{\mathrm{H}}_4^{+}+\mathrm{C}{\mathrm{l}}^{-}$

Considering the basic strength of amines in aqueous solution, which one has the smallest $\mathrm{p}{\mathrm{K}}_{\mathrm{b}}$ value?

1. A.$(\mathrm{C}{\mathrm{H}}_3{)}_3\mathrm{N}$
2. B.${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}{\mathrm{H}}_2$
3. C.$(\mathrm{C}{\mathrm{H}}_3{)}_2\mathrm{NH}$
4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{N}{\mathrm{H}}_2$

1. A.Only (a)
2. B.(a) and (b)
3. C.Only (c)
4. D.(c) and (d)

Among the following species which two have trigonal pyramidal shape? (I) $\mathrm{N}{\mathrm{I}}_3$ (II) ${\mathrm{I}}_3^{-}$ (III) $\mathrm{S}{\mathrm{O}}_3^{2-}$ (IV) $\mathrm{N}{\mathrm{O}}_3^{-}$

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