List of top Chemistry Questions

Which among the following statements are correct? (i) Carbon monoxide is neutral whereas $ S0_3 $ is acidic (ii) Potassium oxide is basic whereas nitrous oxide is acidic (iii) Aluminium and zinc oxides are amphoteric (iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic (v) Carbon dioxide is netural whereas sulphur dioxide is amphoteric

For a first order reaction the rate constant is 6.909 $min^{-1}$. The time taken for 75% conversion in minutes is

In an ionized gas the mobile charge carriers are

An organic compound with the molecular formula $C_8H_8O$ forms $2,4-DNP$ derivative, reduces Tollen?s reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives $1,2$-benzene dicarboxylic acid. The organic compound is

In the reaction,$2KMnO_4 + 16 HCl \rightarrow 5Cl_2 + 2MnCl_2 + 2KCl+8H_2O $ reduction product is

In aqueous solution, $Cr^{2+}$ is stronger reducing agent than $Fe^{2+}$. This is because

In the adsorption of a gas on solid, Freundlich isotherm is obeyed. The slope of the plot is zero. Thus, the extent of adsorption is

For an isolated system, ∆U=0, what will be ∆S ?

Classify the following reactions in one of the reaction type studied in this unit
a) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{HS}^{-} \rightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{SH}+\mathrm{Br}^{-}\)
b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{CH}_{2}+\mathrm{HCl} \rightarrow\left(\mathrm{CH}_{3}\right)_{2} \mathrm{ClC}-\mathrm{CH}_{3}\)
c) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br}+\mathrm{HO}^{-} \rightarrow \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{Br}^{-}\)
d) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{CH}_{2} \mathrm{OH}+\mathrm{HBr} \rightarrow\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CBrCH}_{2} \mathrm{CH}_{3}+\mathrm{H}_{2} \mathrm{O}\)

Although the details of the structure of monoclinic sulphur are not well known it probably consists of

Which one of the following pairs consists of only paramagnetic species?

Which one of the following has the smallest bond angle ?

An odd electron molecule among the following is

Which of the following is paramagnetic with bond order $ 0.5 $ ?

Which of the following is not in green house gas?

The organic compound with two asymmetric carbon atoms is

The standard electrode potentials of $ A{{g}^{+}}/Ag $ is $ +0.80\text{ }V $ and $ C{{u}^{+}}/Cu $ is $ +0.34\text{ }V $ . These electrodes are connected through a salt bridge and if:

The change in potential of the half-cell $Cu^{2+}|Cu$, when aqueous $Cu^{2+}$ solution is diluted $100$ times at $298 \,K$ ? $\left( \frac{2.303 RT}{F} = 0.06 \right)$

The number of lone pair and bond pair of electrons on the sulphur atom in sulphur dioxide molecule are respectively

The molecular geometry of $BF_3$ is

Aluminium (atomic mass = $27$) crystallizes in a cubic system with edge length of $4 \, ?$. Its density is $2.7 \,g \,cm^{-3}$. The number of aluminium atoms present per unit cell is

Sangers reagent is used for the identification of:

An alloy of transition metal containing a non transition metal as a constituent is

Propanal on reaction with dilute sodium hydroxide forms:

1 mole of $FeSO_4$ (atomic weight of Fe is $55.84 \, g \, mol^{-1}$) is oxidized to $Fe_2(SO_4)_3$. Calculate the equivalent weight of ferrous ion