List of top Questions asked in JCECE

An aqueous solution of 6.3 g of oxalic acid dihydrate is made upto 250 mL. The volume of $ \text{0}\text{.1}\,\text{N}\,\text{NaOH} $ required to completely neutralize 10 mL of this solution is

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}} $ )

If the mass of moon is $ \frac{\text{M}}{\text{81}}\text{,} $ where M is the mass of earth, find the distance of the point from the moon, where gravitational field due to earth and moon cancel each other. Given that distance between earth and moon is 60R, where R is the radius of earth.

For sky wave propagation of 10 MHz signal, what should be the minimum electron density in ionosphere?

Paracetamol is a/an

According to Bernoullis equation $ \frac{P}{\rho g}+h+\frac{1}{2}\frac{{{v}^{2}}}{g}=\text{constant} $ The terms A, B and C are generally called respectively:

27 small drops each having charge q and radius r coalesce to from big drop. How many times charge and capacitance will become?

Permanent magnet has properties retentivity and coercivity respectively

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{{}} $

The enzyme which can catalyse the conversion of glucose to ethanol is

Styrene can be purified by

Half-lives of two radioactive substances A and B are respectively 20 min and 40 min. Initially the samples of A and B have equal number of nuclei. After 80 min the ratio of remaining number of A and B nuclei is

Alternating current is transmitted to take places

The magnetic moment has dimensions of

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: