List of top Chemistry Questions

Pi-bond (Ti-bond) is formed:

What is packing fraction of $ {}_{26}F{{e}^{56}} $ ? (At. mass = 55.92066)

An element is in $ {{M}^{3+}} $ form. Its electronic configuration is $ [Ar]\,4{{s}^{1}} $ . What is the atomic number of element?

Milk is a colloid in which:

Green vitriol is:

Which of the following has smallest size?

The number of neutrons in the element ${ }_{4} Be ^{9}$ is :

Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.

Which one of the following gives positive Fehling's solution test?

Ionisation constant of $ CH_3COOH $ is $ 1.7 \times 10^{-5} $ and concentration of $ H^+ $ ions is $ 3.4 \times 10^{-4} $ . Then, find out initial concentration of $ CH_3COOH $ molecules.

An organic compound $A(C_4 H_9 C1)$ on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is

A compound of molecular formula $C_7H_{16}$ shows optical isomerism, compound will be

Standard electrode potentials for Fe electrode are given as $Fe^{2+}+2e^{-} \rightarrow Fe ; E^{o}=-0.44 V$ $Fe^{3+}+e^{-} \rightarrow Fe^{2+}; E^{o}=+0.77 V$ $ Fe^{2+}, Fe^{3+}$ and Fe blocks are kept together then

Pure water can be obtained from sea water by

Which of the following is correct statement?

Which of the following is correct about $H$-bonding in $DNA$?

For the reaction, $2N_{2}O_{5} \to 4NO_{2} + O_{2}$ rate and rate constant are $1.02 \times 10^{-4}\,mol\, L^{-1} s^{-1}$ and $3.4 \times 10^{-5} s^{-1}$ respectively. The concentration of $N_{2}O_{5}$ in mol $L^{-1}$ will be

In preparation of alkene from alcohol using $ Al_2 O_3$, which is effective factor?

In which of the following, bond angle is maximum?

In $X - H ------Y ,X$ and $ Y$ both are electronegative elements, then

The beans are cooked earlier in pressure cooker, because

The correct acidic order of following is

When a biochemical reaction is carried out in laboratory from outside of human body in the absence of enzyme, the rate of reaction obtained is $10^{-6}$ times, then activation energy of the reaction in the presence of enzyme is

Which statement is incorrect?

Which of the following will give maximum number of isomers?