d-and f-Block Elements — Chemistry STD 12 Science — Question

Which of the following metals is generally found in free state?

In the following reaction the product 'C' will be :

To determine the solubility of a solute in water, a solution must be prepared that is___________.

A student slowly mixes salt into 25ml of water until no more salt dissolves in it. The student could make more salt dissolve in the solution by:

An organic compound gives iodoform test and also gives positive test with Tollen's reagent. The compound is:

The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________.

Salts of transition metals are generally coloured, because :

Which elements shows the highest number of oxidation states ?

Silver ornaments turn black by the presence of which gas in the atmosphere?

Two containers, X and Y at 300K and 350K with water vapour pressures 22mm and 40mm respectively a are connected, initially closed with a valve. If the valves opened.