List of top Chemistry Questions

Saturated solution of $KNO_{3}$ is used to make salt bridge because}

Which of following is responsible for temporary hardness of water?

In a galvanic cell, electrons flow from

Which of the following is an example of non-electrolyte?

A 2 kg water sample contains 408 mg of $CaSO_{4}$ (M.wt=136). The hardness in terms of $CaCO_{3}$ equivalents (in ppm) is

A gaseous mixture contains 14 g of $N_{2}$, 8.0 g of $O_{2}$ and 8.0 g of $H_{2}$. Total number of molecules present in the mixture is ($N_{A}$ = Avogadro number) (At.wt; H=1, N=14, O=16)}

The mass of $Na_{2}CO_{3}$ (in g) (M.wt=106) present in 1.0 L of 0.05 M solution is

Identify the molecule in which central atom is not obeying the octet rule.

The ratio of equivalent weights of $HNO_{3}$ and $H_{2}SO_{4}$ is

Which of the following cannot act as a buffer?

200 mL of 0.1 M NaOH is allowed to react completely with 100 mL of 0.1 M HCl and the solution is diluted to 1.0 L by adding water. The pH of the mixture is

The n, l values possible for a sublevel with seven degenerate orbitals are respectively

In which of the following, the number of unpaired electrons is maximum?

The number of electrons with magnetic quantum number $m_{l} = 0$ in chloride ion is

Atomic numbers of four elements A, B, C and D are (Z-1), (Z+2), Z and (Z+1) respectively. If Z=9, the type of bonding between A and B is

If $32\text{ g}$ of methane reacts completely with oxygen, how much water is produced? ($\text{CH}_4 = 16\text{ g/mol}$, $\text{H}_2\text{O} = 18\text{ g/mol}$)

Which of the following statements is correct about Hg?

The oxidation state of Cr in $\text{K}_2\text{Cr}_2\text{O}_7$ is:

The oxidation states of carbon in $\text{CH}_4$ and $\text{CCl}_4$ respectively are:

The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of CO2(g) formed when 3.38 g of this hydrocarbon is completely burnt in oxygen is: (Given: Molar mass in g mol\(^{-1}\): C: 12, H: 1, O: 16)}

Which of the following reaction is correctly matched with their product ?

\( \text{K}_2\text{HgI}_4 \) is \( 40\% \) ionised in aqueous solution. The value of its van't Hoff factor (i) is:

Given below are two statements:
Statement I: trans-But-2-ene upon treatment with $\text{Br}_2$ in $\text{CCl}_4$ gives the following product:

Statement II: cis-But-2-ene upon treatment with alkaline $\text{KMnO}_4$ gives the following product:

In the light of the above statements, choose the most appropriate answer from the options given below.

According to Werner's theory, the primary valencies of the central metal atom :

Which of the following does not belong to Group 16 elements?