List of top Chemistry Questions

The substance not likely to contain $CaCO _{3}$ is:

In curing cement plasters water is sprinkled from time to time. This helps in :

In an irreversible process taking place at constant $T$ and $P$ and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and change in entropy (dS), satisfy the criteria:

The internal energy change when a system goes from state $A$ to $B$ is $40 \,k J / mol$. If the system goes from $A$ to $B$ by a reversible path and returns to state $A$ by an irreversible path, what would be the net change in internal energy?

The de-Broglie wavelength of a tennis ball of mass $60\, g$ moving with a velocity of $10 m / s$ is approximately : (Planck's constant, $h=6.63 \times 10^{-34} \,Js$ )

Several blocks of magnesium are fixed to the bottom of a ship to :

How does the ionisation energy of 1st group elements vary ?

How many electrons are involved in the oxidationby $KMnO_4$ in basic medium ?

Which of the following is an example of ketohexose ?

In the electrolytic cell, flow of electrons is from

An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon.The ester formed will be

$[X] + H_2 SO_4 \longrightarrow [Y]$ a colourless gas with irritating smell $[Y] + K_2 Cr_2 O_7 + H_2 SO_4 \longrightarrow$ green solution $[X]$ and $ [Y]$ are

In the process of extraction of gold, Roasted gold ore $+CN^-+H_2O\xrightarrow{O_2}[X]+HO$ $[X]+Zn\rightarrow[Y]+Au$ Identify the complexes [X] and [Y]

For $H_3PO_3\, and\, H_3PO_4,$ the correct choice is

Among the following, the molecule with the highest dipole moment is

$Me_2SiCl_2$ on hydrolysis will produce

Vapour density of a volatile substance is $4 \left( CH _{4}=1\right)$. Its molecular weight would ho.

Quartz is an example of:

Propionic acid and $KOH$ reacts to produce which one of the following?

$ H_{3}PO_{3}$ is:

Dehydration of alcohol involves:

Cadmium rods are used for which purpose?

Which of the following turns potassium dichromate paper green?

An asymmetric carbon atom is which:

The most reactive hydrocarbon is: