List of top Chemistry Questions

The following reaction is a reversible reaction that exhibits high temperature behaviour:
Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction corresponding to the formation of the slag.
Consider the reactions
The mechanisms of reactions (i) and (ii) are respectively
Match List-I with List-II for the compositions of substances and select the correct answer using the codes given below the lists.
A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?
In CuSO₄ solution when electric current equal to 2.5 Faraday is passed, the gram equivalent deposited on the cathode is
In which of the following reactions, standard entropy change $(\Delta S^{\circ})$ is positive and standard Gibb?s energy change $(\Delta G^{\circ})$ decreases sharply with increasing temperature ?
The pOH value of a solution whose hydroxide ion concentration is $6.2 \times 10^{-9}$ mol/litre is
An ideal gas can?t be liquefied because
Complete hydrolysis of cellulose gives
In the reaction $3 Br _{2}+6 CO _{3}^{2-}+3 H _{2} O \longrightarrow 5 Br ^{-}+ BrO _{3}^{-}+6 HCO _{3}^{-}$
The reaction, $SO _{2}+ Cl _{2} \longrightarrow SO _{2} Cl _{2}$ is exothermic and reversible. $A$ mixture of $SO _{2}( g ), Cl _{2}( g )$ and $SO _{2} Cl _{2}(l)$ is at equilibrium in a closed container. Now a certain quantity of extra $SO _{2}$ is introduced into the container, the volume remaining the same. Which of the following is/are true?
Which of the following combinations would not result in the formation of a buffer solution?
$0.45 \,g$ of acid molecular weight $90$ is neutralised by $20\, ml$ of $0.5\,N$ caustic potash. The basicity of acid is
If the radius of $H$ is $0.53\, ? $, then what will be the radius of $_3Li^{2+}$ ?
Which of the following does not have valence electron in $3d$-subshell?
The van�t Hoff factor $i$ for an electrolyte which undergoes dissociation and association in solvents are respectively
Which of the following is process used for the preparation of acetone?
Match List I (Equations) with List II (Types of process) and select the correct option.
Following compounds are given (i) $CH _{3} CH _{2} OH$ (ii) $CH _{3} COCH _{3}$ (iii) $CH _{3}- \underset{\overset{|}{C}H_3}{C}HOH$ (iv) $CH _{3} OH$ Which of the above compound(s) on being warmed with iodine solution and $NaOH$, will give iodoform?
The order of reactivity of phenyl magnesium bromide $(PhMgBr)$ with the following compounds
The pressure exerted by $6.0 \,g$ of methane gas in a $0.03\, m ^{3}$ vessel at $129^{\circ} \,C$ is (Atomic masses: $C =12.01, \,H =1.01$ and $\left.R=8.314\, JK ^{-1} \,mol ^{-1}\right)$