List of top Chemistry Questions

Ethyl isocyanide on hydrolysis in acidic medium generates

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

Bottles containing $ {C6H5I}$ and $ {C6H5CH2I}$ lost their original labels. They were labelled A and B for testing. A and B were separately taken in test tubes and boiled with $ {NaOH }$ solution. The end solution in each tube was made acidic with dilute $ {HNO3}$ and then some $ {AgNO3}$ solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment ?

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

The atomic number of V, Cr, Mn and Fe are respectively 23, 24, 25 and 26.Which one of these may be expected to have the highest second ionisation enthalpy ?

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be

According to the kinetic theory of gases, in an ideal gas, between two successive collisions, a gas molecule travels

The solubilities of carbonates decrease down the magnesium group due to a decrease in :

Which one of the following processes will produce hard water ?

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