List of practice Questions

Which of the following reactions does not take place? $ {BF3 + F^{-} ->BF4^{-}}$$\quad\quad\quad\quad\quad\quad\quad\quad\ldots\left(I\right)$ $ {BF3 + 3F^{-} ->BF6^{3-}}$$\quad\quad\quad\quad\quad\quad\quad\ldots\left(II\right)$ $ {AlF3 + 3F^{-} ->AlF6^{3-}}$$\quad\quad\quad\quad\quad\quad\ldots\left(III\right)$

Which of the following species is not aromatic?

Which one of the following exhibits positive resonance effect (+R effect)?

Which one of the following is an achiral molecule?

Which pair of the following 4d series of elements has the same number of electrons in 4d subwell?

Which of the following can be oxidised by $SO_2$ ?

Value of $\left[\left(\log_{b}\,a\right)\left(\log_{c}\,b\right)\left(\log_{a}\,c\right)\right]$ is

Two elements $A$ and $B$ form compounds of formula $AB_2$ and $AB_4$. When dissolved in $20.0\, g$ of benzene $1.0 \,g$ of $AB_2$ lowers f. pt. by 2.3$^{\circ}$C whereas $1.0\, g$ of $AB_4$ lowers f. pt. by 1.3$^{\circ}$C. The $K_f$ for benzene is $5.1$. The atomic masses of $A$ and $B$ are

Thermal decomposition of ammonium dichromate gives

The two coherent sources with intensity ratio $\beta$ produce interference. The fringe visibility will be

The substance magnetite is

The stress-strain graph of a material is shown in the figure. The region in which the material is elastic is

The self inductance of a long solenoid carrying current is independent of

The reaction, $C_6H_5ONa + CO_2 + H_2O \to C_6H_5OH + NaHCO_3$ suggests that

The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is 9 : 1. The intensities of the used light sources are in ratio

The freezing point of a solution containing 0.2 g of acetic acid in 20.0 g benzene is lowered by 0.45 $^{\circ}$C. The degree of association of acetic acid in benzene is (Assume acetic acid dimerises in benzene and $K_f$ for benzene = $5.12\, K \,kg \,mol^{-1}$) $M_{observed}$ of acetic acid = 113.78

The energy stored in a parallel plate capacitor of cross section area $ A $ with a separation $ d $ being filled with dielectric of dielectric constant $ \varepsilon_{0} $ in terms of the electric field between them, $ E $ is

The emergent ray of light after refraction at a rectangular glass slab

The electric field strength in $N \,C\,^{-1}$ that is required to just prevent a water drop carrying a charge $1.6 \times 10^{-19} \, C$ from falling under gravity is $(g\, = \,9.8\, ms^{-2}$, mass of water drop = $0.0016\,g$)

The correct set of four quantum numbers for the electron in the outermost subshell of $ Cu $ atom (atomic number 29) in its ground state, is

Tetradynamous condition is found in

Some of the steps of DNA fingerprinting are given below. Identify the correct sequence from the options given : A. Electrophoresis of DNA fragments B. Hybridisation with DNA probe C. Digestion of DNA by RENs D. Autoradiography E. Blotting of DNA fragments to nitrocellulose membrane

$\sin^{2}\,\theta\, \cos^{3}\,\theta-\sin^{4}\,\theta\, \cos\,\theta$ is equal

Oxidative decarboxylation occurs during the formation of