List of top Chemistry Questions

0 .15 g of a substance dissolved in 15 g of a solvent higher by 0.216$^\circ$C than that of the pure solvent. Find out the molecular weight of the substance. $(K_b\, for\, solvent \, is\, 2.16 ^\circ C)$
The oxidation number of phosphorus in pyrophosphoric acid is
Gammexane is
Amides can be converted into amines by a reaction named after
The type of hybridization of boron in diborane is
The most suitable method of the separation of a mixture of ortho and para nitrophenol mixed in the ratio of 1 : 1 is
Ethyl chloride is converted into diethyl ether by
Which of the following configuration is correct for iron?
Natural rubber is a polymer of
Purification of aluminium by electrolytic refining is called
The Minamata disease in Japan was caused through the pollution of water by
Terylene is a condensation polymer of ethylene glycol and
Who modified Bohr's theory by introducing elliptical orbits for electron path?
The specific conductance of a $N / 10 \,KCl$ at $25^{\circ} C$ is $0.0112\, ohm ^{-1} cm ^{-1} .$ The resistance of cell containing solution at the same temperature was found to be $55\, ohm$. The cell constant will be
Cassiterite is an ore of
The alum used for purifying water is
The oxyacid of phosphorus in which phosphorushas the lowest oxidation state is
For the chemical reaction,$3 X ( g) + Y ( g) \rightleftharpoons \, X_3 \, Y $ ( g) the amount of $X_3 Y$ at equilibrium is affected by
Which of the following metals is present in brass, bronze and german-silver?
How many g of dibasic acid (mol. wt. 200) should be present in 100 mL of the aqueous solution to give 0.1 normality ?
Bell-metal is an alloy of
Aldol condensation will not take place in
At $25^\circ $C and 730 mm pressure, 380 mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occupy at 760 mm pressure?
In Friedal-Craft's alkylation besides $AlCl_3$ the other reactants are
The solubility of a saturated solution of calcium fluoride is $2 \times 10^{-4}$ moles per litre. Its solubility product is