List of top Chemistry Questions

The enthalpy of neutralization of HCI and NaOH is x kJ. The heat evolved when 500 ml of 2 N HCl is mixed with 250 mt of 4 N NaOH will be
The atomic number of the element with highest ionization energy among the following is
The heat of formation of $ {H_2O_{(l)}}$ is -286 kJ. The? heat of formation of $ { H_2O_{(g)}}$ is likely to be
In Lassaigne's test for nitrogen in an organic compound, the blue colouration is due to the formation of
Which one of the following ores is obtained by floatation process?
For the dissociation of limestone in the slag zone of the blast furnace, the reaction is
The oxidation number of oxygen is -1 in
The conjugate acid of $ NH_2^- $ is
Two ions $A^+$ and $B^-$ have radii 104 and 200 pm respectively, in a cubic close packed crystal of compound AB. The co-ordination no. of A is
An electron having spin quantum number, $s = -1/2$ and magnetic quantum number, $m = + 3$ can be present in
The ionisation constant of phenol is higher than that of ethanol because
The mole fraction of benzene in a solution containing 39% by mass in an organic solvent of molecular mass 122 is
Buffer solutions have constant acidity and alkalinity because
In which of the following compounds, nitrogen exhibits highest oxidation state ?
Which one of the following is a mineral of iron?
Consider the reaction: ${ RCHO + NH2NH2 -> RCH = N - NH2 }$ What sort of reaction is it ?
In the following sequence of reactions, \(CH _{3}- Br \stackrel{ KCN }{\longrightarrow} A \stackrel{ H _{3} O ^{+}}{\longrightarrow} B \stackrel{ LiAlH _{4}}{\longrightarrow} C\), the end product C is
The compressibility factor for a real gas at high pressure is :
For an ideal system at thermal equilibrium, the velocity distribution of the constituent particles will be governed by
Consider the following reaction ${ ->[H_2][pd-BaSO_4] 'A'}$ The product 'A' is -
If the first ionization energy of $H$ atom is $13.6\, eV$, then the $2^{nd}$ ionization energy of He atom is
In the following reaction, $C_6H_5CH_2Br \ce{->[{(i) \text{Mg,Ether}}][{(ii) H_3O^+}] X }$ the product ' $X$ ' is
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?
Which one of the following compounds will be most readily dehydrated ?
Which one of the following compounds will be most readily dehydrated ?