List of top Chemistry Questions

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
When mercuric iodide is added to the aqueous solution of potassium iodide
The IUPAC name of the compound $CH_2=CH-CH(CH_3)_2 $ is
Which of the following oxides of nitrogen is a coloured gas ?
Bromine can be liberated from potassium bromide solution by the action of
If two compounds have the same empirical formula but different molecular formulae, they must have
Fluorine does not show positive oxidation states due to the absence of
Atomic radii of fluorine and neon in Angstrom units are respectively given by
Hydrogen bonding is maximum in
The brown ring complex compound is formulated as $[Fe (H_2 O)_5 (NO)^+] SO_4.$ The oxidation state of iron is
Amongst the trihalides of nitrogen, which one is least basic?
A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at cathode and anode are respectively
The half-life period of a radioactive element is 140 days. After 650 days, one gram of the element will reduce to
A molal solution is one that contains one mole of solute in