List of practice Questions

Which of the following is used as disinfectant as well as antiseptic?
At what temperature does the volume of a gas become absolutely zero?
What is the coordination number of a cation in an ionic compound if the type of hole occupied by the cation is octahedral?
Which catalyst is used in conversion of chlorobenzene to phenol by Rasching process?
Which class of terpenes includes \(\beta\)-carotene?
What is the highest oxidation state exhibited by actinoids?
Which among the following is NOT obtained when bromobenzene is treated with bromoethane and sodium in presence of dry ether?
What is the oxidation state and coordination number of platinum respectively in
\[ \left[\mathrm{Pt(NH_3)_6}\right]^{4+}\,? \]
What is the difference in molar mass of any two neighbouring alkanes?
Which among the following elements has the lowest value of electronegativity?
Identify the monomers used in preparation of Novolac.
What is the oxidation state of chlorine atom in hypochlorous acid?
In meter-bridge experiment a resistance of \(18\,\Omega\) is connected in left gap and unknown resistance \(R\) is connected in right gap. The null point is obtained at \(\ell_1\) from left end. If unknown resistance is replaced by \(\left(\frac{R}{3}\right)\Omega\), the null point is obtained at \(1.5\ell_1\). The unknown resistance is
Two satellites \(A\) and \(B\) of same mass are revolving round the earth at height \(2R\) and \(3R\) respectively above the surface of the earth. The ratio of kinetic energies of \(A\) to \(B\) will be
For athermanous substances, coefficient of transmission is
A motorcyclist rides in a horizontal circle about a central vertical axis inside a cylindrical chamber of radius \(r\). If the coefficient of friction between the tyres and the inner surface of the chamber is \(\mu\), the minimum speed of motorcyclist to prevent him from skidding is (\(g\) = acceleration due to gravity)
For a gas \(\dfrac{R}{C_v} = 0.67\). This gas is made up of molecules which are
Identify `A` in the following reaction:
\[ A \xrightarrow[\text{pyridine, reflux}]{\text{SOCl}_2} B \xrightarrow[\Delta]{\text{KCN (alcoholic)}} \text{Propane nitrile} \]
A lift of mass \(m\) is ascending with an acceleration \(a\) (\(a<g\)). The tension in the cable of the lift is ( \(g\) = acceleration due to gravity )
If a p–n junction diode is reverse biased then
A prism having refractive index \(\sqrt{2}\) and refracting angle \(30^\circ\) has one of the refracting surfaces silvered. The beam of light incident on the other refracting surface will retrace its path, if angle of incidence is \([\sin(\pi/6)=0.5]\)
The resultant of two vectors \(\vec{P}\) and \(\vec{Q}\) is \(\vec{R}\). When the direction of \(\vec{Q}\) is reversed, the resultant is given by \(\vec{S}\). Which one of the following is true for vectors \(\vec{R}\) and \(\vec{S}\)?
A water film is formed between two straight parallel wires, each of length \(10\,\text{cm}\), kept at a separation of \(0.5\,\text{cm}\). Now, the separation between them is increased by \(1\,\text{mm}\) without breaking the water film. The work done for this is (surface tension of water \(= 7.2 \times 10^{-2}\,\text{N m}^{-1}\))
An electron in the ground state of hydrogen atom is revolving in a circular orbit of radius \(R\). The orbital magnetic moment of the electron is (\(m\) = mass of electron, \(h\) = Planck’s constant, \(e\) = electronic charge)
A bar magnet is held perpendicular to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it. Through what angle should it be rotated? \([\sin(\pi/2)=1]\)