List of practice Questions

Grignard reagent is not prepared in aqueous medium but it is prepared in ether medium because
In the figure shown a block of weight 10 N is resting on a horizontal surface (figure). The coefficient of static friction between the block and surface is force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block then:
a block of weight 10 N is resting on a horizontal surface
Interferons are synthesized in response to
A sine wave has an amplitude A and wavelength $\lambda$ . Let V be the wave velocity and maximum velocity of a particle in the medium. Then
How many moles of acidified $FeSO_4$ solution canbe completely oxidised by one mole of $KMnO_4$ ?
In the presence of cobalt chloride $(CoCl_2)$,bleaching powder decomposes to form....
Sodium hexametaphosphate is known as
Darwin's theory of pangenesis shows similarity with theory of inheritance of acquired characters then what shall be correct according to it
Bond dissociation energies of HF, HCl,HBr follow the order..
The e.m.f. of a cell, whose half-cells are given below, is: $ M{{g}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Mg(s); $ $ E{}^\circ =-\,2.37\,\,V $ $ C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu(s); $ $ E{}^\circ =+\,0.34\,\,V $
What is the atomic number (Z) of the noble gasthat reacts with fluorine ?
At the time of organogenesis genes regulate the process at different levels and at different time due to
An organic compound $A(C_4 H_9 C1)$ on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is
Maximum number of bases in plasmids discovered so far
A compound of molecular formula $C_7H_{16}$ shows optical isomerism, compound will be
Which one of the following halogen liberates oxygen, when passed through hot concentrated KOH solution ?
Phenol is treated with bromine water and shaken well to get white precipitate. The white precipitate is
The magnetic fields at two points on the axis of a circular coil at distance of 0.05 m and 0.2 m from the centre are in the ratio 8 :1 . The radius of the coil is
Characteristics character of human cornea
If the energy of a hydrogen atom in nth orbit is $E_n$, then energy in the nth orbit of a singly ionized helium atom will be
A point source of light is placed 4 m below the surface of water of refractive index is 5/3. The minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is:
Vapour density of a metal chloride is 47.5. If the valency of metal is 2, the metal is:
For the reaction, $2N_{2}O_{5} \to 4NO_{2} + O_{2}$ rate and rate constant are $1.02 \times 10^{-4}\,mol\, L^{-1} s^{-1}$ and $3.4 \times 10^{-5} s^{-1}$ respectively. The concentration of $N_{2}O_{5}$ in mol $L^{-1}$ will be
A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat Q1 cal/sec. If all the linear dimension are doubled keeping temperature remain const. then rate of flow of heat Q2 will be
Which of the following is correct about $H$-bonding in $DNA$?