A complex  ion among the following can absorb visible light is:
(At. no. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

1. [Sc(H₂O)₃(NH₃)₃]³⁺

2. [Ti(en)₂ (NH₃)₂]⁴⁺

3. [Cr(NH₃)₆]³⁺

4. [Zn(NH₃)₆]²⁺

Calculate the specific rate constant of the reaction if the half-life period of a first-order reaction is 1386 s?

1. $5.0\times {10}^{-3}{s}^{-1}$

2. $0.5\times {10}^{-2}{s}^{-1}$

3. $0.5\times {10}^{-3}{s}^{-1}$

4. $5.0\times {10}^{-2}{s}^{-1}$

Phenol in a set of reactions (as captured below) yielded a product Z.

\(\text{Phenol}\ \xrightarrow{\text{Zn Dust}}\ \text{X}\ \xrightarrow[\text{Anhy. }{AlCl_3}]{CH_3Cl}\ Y\)
\( Y\ \xrightarrow[KMnO_4]{\text{Alkaline}}\ Z\)
The structure of the product Z would be:

Copper crystallizes in a face-centered cubic lattice with a unit cell length of 361 pm. The radius of the copper atom is:

1. 128 pm

2. 157 pm

3. 181 pm

4. 108 pm

For the reaction, A + B → products, it is observed that-
(1) On doubling the initial concentration of A only, the rate of reaction is also doubled and 
(2) On doubling the initial concentrations of both A and B, there is a change by a factor of 8 in the rate of the reaction. 
The rate of this reaction is given by:

1. $rate=k$ $\left[A{]}^2\right[B]$

2. $rate=k$ $\left[A\right][B{]}^2$

3. $rate=k$ $\left[A{]}^2\right[B{]}^2$

4. $rate=k$ $\left[A\right]\left[B\right]$

According to the MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?

1. $N_2^{-}<N_2<N_2^{2-}$

2. $N_2^{2-}<N_2^{-}<N_2$

3. $N_2<N_2^{2-}<N_2^{-}$

4. $N_2^{-}<N_2^{2-}<N_2$

The correct state of hybridisation of C₂, C₃, C₅ and C₆ of the hydrocarbon 

 is in the sequence:
1. sp, sp³, sp² and sp³
2. sp³, sp², sp² and sp
3. sp, sp², sp² and sp³
4. sp, sp², sp³ and sp²

Among the following which is the strongest oxidising agent?

1. $F_2$

2. $B{r}_2$

3. $l_2$

4. $C{l}_2$

The molar conductance of $\frac{\mathrm{M}}{32}$ solution of a weak monobasic acid is 8.0 ohm^-1 cm² and at infinite dilution is 400 ohm^-1 cm². The dissociation constant of this acid is: 

Structures of some common polymers are given. The incorrect match is:

1.	Teflon
2.	Neoprene
3.	Terylene
4.	Nylon 66