List of top Chemistry Questions

Elements $X$, $Y$ and $Z$ have atomic numbers $19$, $37$ and $55$ respectively. Which of the following statements is true about them?

Elements of group-$15$ form compounds in $+5$ oxidation state. However, bismuth forms only one well characterised compound in $+5$ oxidation state. The compound is

Element X forms a chloride with the formula $XCl_2$, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as -

Element of group 16 (except polonium) are called chalcogens because

Element having maximum electron affinity is

Element found in the sediments in the ocean floor is

Electronic configuration (outermost) of $Mn^{2+}$ ion(At. No. of Mn = 25) in its ground state is

Electropositive character for the elements of group $13$ follows the order

Electrolytic reduction method is used in the extraction of

Electromagnetic separation is used in the concentration of

Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on

Eka-aluminium and Eka-silicon are known as

Effective atomic number of Fe in the complex $K_4[Fe(CN)_6]$ is

Edge length of a cube is 400 pm. Its body diagonal would be

Each of the following solids show, the Frenkel defect except

E.D.T.A. is generally a

Dye test can be used to distinguish between

During the electrolysis of aqueous sodium chloride the cathodic reaction is

During smelting an additional substance is added which combines with impurities to form a fusible product. It is known as

During electrolysis of NaOH

During acetylation of glucose it needs $x$ moles of acetic anhydride. The value of $x$ would be

During addition polymerisation of ethene molecules, the initiator like benzoyl peroxide, acetyl peroxide, tert-butyl peroxide, etc. are added. Their function is to

Due to Frankel defect, the density of ionic solids

Dry bleach is done by

Dry powder fire extinguisher contains