List of practice Questions

What is the maximum number of emission lines obtained when the excited electron of a hydrogen atom in $ n=5 $ drops to the ground state?
$ {{N}_{2}} $ and $ {{O}_{2}} $ are converted to monopositive cations $ N_{2}^{+} $ and $ O_{2}^{+} $ respectively. Which is incorrect?
$n$ identical drops, each of capacitance $C$ and charged to a potential $V$, coalesce to form a bigger drop. Then the ratio of the energy stored in the big drop to that in each small drop is
The relation between the time of flight of projectile $T_f$ and the time to reach the maximum height $t_m$ is
One Faraday of electricity is passed through molten $Al_2O_3$ aqueous solution of $CuSO_4$ and molten $NaCl$ taken in three different electrolytic cells connected in series. The mole ratio of $Al,Cu$ and $Na$ deposited at the respective cathode is
An object is projected so that its horizontal range $R$ is maximum. If the maximum height attained by the object is $H$, then the ratio of $R/H$ is
An object placed on an inclined plane starts sliding when the angle of incline becomes $30^{\circ}$. The coefficient of static friction between the object and the plane is
The colourless gas that turns brown in air is
The $d$ and $l$ enantiomers of an optically active compound differ in
The elastic energy stored per unit volume in a stretched wire is
The mobility of free electrons (charge = $e$, mass = $m$ and relaxation time = $ \tau $ .) in a metal is proportional to
Why do calcium ions makes water hard but sodium ion does not?
Formation of methyl tertiary butyl ether by the reaction of sodium tertiary butoxide and methyl bromide involves
If the radius of a nucleus of mass number $3$ is $R$ ,then the radius of a nucleus of mass number $81$ is
Faraday's constant is defined as
German silver is an alloy of
The thermal decomposition of a molecule shows first order kinetics. The molecule decomposes 50% in 120 min. How much time it will take to decompose 90%?
Mean free path of a gas molecule is
The secondary precursors of photochemical smog are
Identify the false statement
The complex $[CoF_{6}]^{4-}$ is
A Carnot cycle has the reversible processes in the following order
$IUPAC$ name of the complex $K_{3}\left[A l\left(C_{2} O_{4}\right)_{3}\right]$ is
Dual behaviour of matter was proposed by
A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is