List of top Chemistry Questions

One litre hard water contains 12.00 mg $Mg^{2+}$. Milliequivalents of washing soda required to remove its hardness is

The outermost electronic configuration of the most electronegative element is

The atomic nucleus contains

Which of the following is optically inactive?

The first ionisation potential of Na, Mg, Al and Si are in the

The equivalent weight of MnSO$_4$ is half of its molecular weight, when it converts to

In which mode of expression, the concentration of a solution remains independent of temperature?

For the reaction , $ CO ( g) + H_2 O ( g) \rightleftharpoons \, CO_2 \, ( g) + H_2 \, ( g ) $ at a given temperature, the equilibrium amount of $CO_2 (g)$ can be increased by

Which one of the following is the true covalent oxide of iodine ?

RNA does not possess

Keto-enol tautomerism is observed in

Calorific value is in order

Which one is formed when sodium phenoxide is heated with ethyl iodide?

What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?

Lucas reagent is

If formaldehyde and KOH are heated then we get

Formalin is an aqueous solution of

The $ pK_a$ of acetyl salicylic acid (aspirin) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about 8. A spirin will be

The oxidation number of phosphorus in Ba(H$_2PO_2 )_2$ is

The number of structural and configurational isomers of a brorno compound, $C_5 H_9 Br,$ formed by the addition of HBr to 2-pentyne respectively, are

Potassium manganate $(K_2MnO_4)$ is formed when

The orbital diagram in which Aufbau principle is violated is

The wavelength of a spectral line for an electronic transition is inversely related to

A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends the white ammonium chloride ring first formed will be

The molecule that has linear structure is