List of top Chemistry Questions

Cycloalkane formed when $1, 4$ -dibromopehtane is heated with Sodium is

Conversion of benzene to acetophenone can be brought by

Intramolecular Hydrogen bonding is formed in

Excess of $PCl_5$ reacts with conc. $H_2SO_4$ giving

$ Ca{{(HC{{O}_{3}})}_{2}}(s) $ decomposes as $ Ca{{(HC{{O}_{3}})}_{2}}(s)\xrightarrow[{}]{{}}CaC{{O}_{3}}(s)+{{H}_{2}}O(g) $ $ +C{{O}_{2}}(g) $ Total pressure at equilibrium is found to be 0.12 bar. Thus, $ {{K}_{p}} $ 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

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?

In the reaction $3 Br _{2}+6 CO _{3}^{2-}+3 H _{2} O \longrightarrow 5 Br ^{-}+ BrO _{3}^{-}+6 HCO _{3}^{-}$

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 $\left.R=8.314\, JK ^{-1} \,mol ^{-1}\right)$

Some of the properties of the two species, $NO _{3}^{-}$and $H _{3} O ^{+}$are described below. Which one of them is correct?

What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na = 5.1 \,eV$ ?

Which has the maximum number of molecules among the following ?

In the following reaction, $C_6H_5CH_2Br \ce{->[{(i) \text{Mg,Ether}}][{(ii) H_3O^+}] X }$ the product ' $X$ ' is