List of top Chemistry Questions

The increasing order of the density of alkali metals is

Arrange the following ions in the order of decreasing X-0 bond length, where X is the central atom in $SiO_4^{4-},ClO_4^- ,PO_4^{3-},SO_4^{2-}$

Match the following correctly

Glucose on oxidation with bromine water gives

Detergents are known to pollute rivers and waterways. However, detergents can be made biodegradable and pollution free by taking

In the estimation of sulphur by Carius method, $0.480\, g$ of an organic compound gives $0.699 \,g$ of barium sulphate. The percentage of sulphur in this compound is (Atomic masses: $Ba\, = 137, S = 32, 0 = 16)$

The reaction of $ CHC{{l}_{3}} $ and alcoholic $ KOH $ with $ p $ -toluidine gives

Which one of the following has a different crystal lattice from those of the rest?

The correct order of ease of cleavage of ether linkage by hydrogen halide follows

Dry air is passed through a solution containing $ 10\,g $ of a solute in $ 90\,g $ of water and then through pure water. The loss in weight of solution is $ 2.5\,g $ and that of pure solvent is $ 0.05 \,g $ . Calculate the molecular weight of the solute.

Which one of the following amines forms a non-acidic and alkali insoluble product with p-toluenesulphonyl chloride?

For a first order reaction, the time taken to reduce the initial concentration by a factor of 1/4 is 20 min. The time required to reduce initial concentration by a factor of 1/16 is

When methane is heated with dioxygen in the presence of $Mo_2O_3$ catalyst, the organic product obtained is

Which of the following pairs contain metalloid elements in the periodic table?

Two vessels of volumes $16.4\, L$ and $5\,L$ contain two ideal gases of molecular existence at the respective temperature of $27^?C$ and $227^?C$ and exert $1.5$ and $4.1$ atmospheres respectively. The ratio of the number of molecules of the former to that of the latter is

In the preparation of potassium permanganate, pyrolusite $ (Mn{{O}_{2}}) $ is first converted to potassium manganate $ ({{K}_{2}}Mn{{O}_{4}}) $ . In this conversion, the oxidation state of manganese changes from:

The metal that produces red-violet colour in the non-luminous flame is

How many amino acids are present in insulin?

Lassaigne?s test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorin because the product $AgF$ formed is

How many molecules of $CO_2$ are formed when one milligram of $100\%$ pure $CaCO_3$ is treated with excess hydrochloric acid?

When chlorobenzene is reacted with acetyl chloride in the presence of anhydrous AICI$_3$, the major product formed is

Neopentyl bromide undergoes dehydrohalogenation to give alkenes even though it has no $\beta$- hydrogen. This is due to

The major product of the reaction between tert-butyl chloride and sodium ethoxide is

The donor atom in EDTA are

Which one of the following isomeric amines has the highest boiling point?