List of top Chemistry Questions asked in JCECE

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state one, would be (Rydberg constant $ =1.097\times {{10}^{7}}\,{{m}^{-1}} $ )

Paracetamol is a/an

Styrene can be purified by

Hydrolysis ofphenyl isocyanide forms

Sodium formate on heating gives

Lucas reagent is

When dihydroxy acetone reacts with $HI0_4$, the product is/are

Freon used as refrigerant is

The product of following reaction is $2C{{H}_{3}}MgBr+C{{H}_{2}}O\xrightarrow{{}} $

Styrene can be purified by

Which of the following does not reduce Fehling?s solution?

The most stable compound is

If pH of a solution is 4, then $ {{\text{H}}^{\text{+}}} $ is:

Half-life of a substance is 6 min. If its initial amount is 32 g, then amount present after 18 minis:

When sodium nitrate is heated above $ \text{600}{{\,}^{\text{o}}}\text{C,} $ then:

Which of the following produces $ \text{C}{{\text{l}}_{2}} $ gas?

Lowest melting point chloride is:

$ \text{C}{{\text{H}}_{\text{3}}}\text{COCl} $ does not react with:

Which is extremely stable?

$CH_3COCl$ does not react with

In $ \text{S}{{\text{O}}_{\text{2}}} $ hybridisation is:

What is potential of platinum wire dipped into a solution of 0.1 M in $ S{{n}^{2+}} $ and 0.01 M in $ S{{n}^{4+}}? $

Law of multiple proportions is illustrated by one of the following pairs:

The number of isomeric hexanes is:

Which of the following overlaps leads to bonding?