List of top Chemistry Questions

Addition of excess aqueous ammonia to a pink coloured aqueous solution of $MCl _{2} \cdot 6 H _{2} O (X)$ and $NH _{4} Cl$ gives an octahedral complex $Y$ in the presence of air. In aqueous solution, complex $Y$ behaves as $1: 3$ electrolyte. The reaction of $X$ with excess $HCl$ at room temperature results in the formation of a blue colured complex $Z$. The calculated spin only magnetic moment of $X$ and $Z$ is $3.87\, B.M$., whereas it is zero for complex $Y$. Among the following options, which statement(s) is(are) correct ?

The correct statement(s) about the oxoacids, $HClO_4$ and $HClO$, is(are)

Allene $ (C_3H_4) $ contains

Which of the following pairs of organic compounds give positive Tollens? test?

The geometry and type of hybrid orbital present around the central atom in $ BF_3 $ is

$ IF_7 $ is known to exist while $ BrF_7 $ does not exist. The reason is

Which of the following elements involves gradual filling of $ 4f $ -levels?

The monomer used in Novolac, a polymer used in paints

Galbriel phthalimide synthesis is used in the preparation of primary amine from phthalimide, which of the following reagent is not used during the process ?

Extraction of chlorine from brine solution is based on

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

The artificial sweetener that has the highest sweetness value in comparison to cane sugar is :

At very high pressures, the compressibility factor of one mole of a gas is given by :

The hybridizations of atomic orbitals of nitrogen in $NO _{2}^{+}, NO _{3}^{-}$ and $NH _{4}^{+}$ respectively are

The rate of a first order reaction is $0.04 mol \, l^{-1} \, s^{-1}$ at 10 seconds and $0.03 \, mol \, l^{-1} \, s^{-1}$ at 20 seconds after initiation of the reaction. The half-life period of the reaction is :

Match items of Column I with the items of Column II and assign the correct code:

The suspension of slaked lime in water is known as

The highest DDT concentration in aquatic food chain shall occur in

One mole of an ideal monatomic gas undergoes a process described by the equation $PV^{3}=$ constant. The heat capacity of the gas during this process is -

Natural rubber has :

$MY$ and $NY_3$, two nearly insoluble salts, have the same $K_{SP}$ values of $6.2 \times 10^{-13}$ at room temperature. Which statement would be true in regard to $MY$ and $NY_3$ ?

Which of the following statement about hydrogen is incorrect ?

Which of the following biphenyls is optically active ?

Which among the given molecules can exhibit tautomerism?

Lithium has a $bcc$ structure. Its density is $530 \, kg \, m^{-3}$ and its atomic mass is $6.94 \, g \, mol^{-1}$. Calculate the edge length of a unit cell of Lithium metal. ($NA = 6.02 \times 10^{23} \, mol^{-1}$)