List of top Chemistry Questions on d -and f -Block Elements asked in AIIMS

Which of the following salts is coloured salt before heating?

Which of the following transition elements have melting point below $500^\circ$ C?

$KMnO_4$ on reaction with KOH does not give

In acidic medium, which of the following becomes colourless?

Which of the following exhibits minimum number of oxidation states?

In which of the following elements number of d-electrons is zero in 6d-orbital?

Copper sulphate is dissolved in water containing ________ for making Bordeaux mixture.

The correct order of oxidising power is : $VO_2^+$ $< Cr_2O_7^{2-} < MnO_4^-$ The oxidation state of $Mn$ is $+7$.

$KMnO_4$ in alkaline medium changes to

In presence of acidic medium, $KMnO_4$ converts $H_2S$ into

Which of the following element has lowest melting point?

$K_2Cr_2O_7$ in acidic medium converts into

$MnO_3$ in an acidic medium dissociates into

Magnetic moment of $Cr^{2+}$ is nearest to

$K_2Cr_2O_7$ is used as primary standard in volumetric analysis. It has a good solubility in water.

Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Change in colour is due to complexation of alcohol with potassium dichromate.

Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in

Solution of $Na_2CrO_4$ in water is coloured. Oxidation state of $Cr$ in $Na_2CrO_4$ is $+6$.

Cuprous ion $(Cu^+ )$ is colourless whereas cupric ion $(Cu^{++} )$ is blue in the aqueous solution. Cuprous ion $(Cu^+ )$ has unpaired electrons while cupric ion $(Cu^{++} )$ does not.

Philosopher�s wool when heated with $BaO$ at $1100^{\circ}C$ gives a compound. Identify the compound.

Which of the following metals is present in brass, bronze and german-silver?

Tailing of mercury occurs on passing ozone through it. Due to oxidation of mercury.

Which of the following transition elements shows the highest oxidation state?

Which of the following can give iodometric titration?

Brass is an alloy of copper (Cu) and