List of top Chemistry Questions

The red colouring pigment Haemoglobin in our blood contains which metal ?
Which was the first organic compound synthesized in the laboratory ?
The metal most commonly used for making filament of an electric bulb is :
Which of the following is a member of the Halogen family ?
Natural Rubber obtained from Rubber tree is basically a polymer of :
Metal, which will displace hydrogen from dilute HCl is :
Vinegar, used in kitchen is a dilute solution of :
When water is poured over sodium peroxide, which colourless gas is produced ?
The gas which may cause explosion in coal mines is :
The most abundant gas found in the earth atmosphere is :
Select from the following a set of three metals which are found in free state :
Which of the following is the most electronegative element in the periodic table ?
The number of electrons in an element X is 6 and the number of neutron is 8. Which of the following is the correct representation of the element ?
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion ?
Isotopes of an element have :
A gel toothpaste is a mixture of a :
During summer, water kept in an earthern pot becomes cool because of the phenomenon of :
The Chemical symbol for tin is :
Which of the following has maximum number of atoms ?
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
The compound that can be purified by sublimation is :
Calculate the normality of a solution obtained on mixing 100 ml of $\frac{M}{10} H_2 SO_4 , 50 \, ml$ of $\frac{N}{2} HNO_3$ and $25 \, ml $ of $\frac{N}{5} HCl$ solutions.
A 100 mL flask contained \(H_2\) at 200 torr, and a 200 mL flask contained \(He\) at 100 torr. The two flask were then connected so that each gas filled their combined volume. Assume, no change in temperature, total pressure is
How many milliliters of water must be added to 50.0 mL of 10.0 M HNO3 to prepare 4.00 M HNO3?
The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is