Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Out of [CoF₆]^3- and [Co(en)₃]³⁺, which one complex is
(i) paramagnetic
(ii) more stable
(iii) inner orbital complex and
(iv) high spin complex
(Atomic no. of Co = 27) 

Give reason for the following :  
Sulphur in vapour state shows paramagnetic behaviour. 

Example of ferromagnetic substance is ____________.

Substances which are weakly repelled in magnetic field are known as ____________.

All those atoms or molecules which have an odd number of electrons are

Substances that are strongly attracted by the applied magnetic field and can be permanently magnetized are ____________.

When heated to high temperature, ferromagnetic substance changes to ____________.

Fe₃O₄ is ____________.

Which type of substances would make better permanent magnets?

Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.

Reason: The electrons change their spin on heating.

Tincture of iodine is ____________.

Which one has the lowest boiling point?

Fluorine differs from the rest of the halogens in some of its properties. This is due to ____________.

The set with the correct order of acidity is:

The nucleic acid base having two possible binding sites is ____________.

Fe₃O₄ (magnetite) is an example of ___________.

Which is the strongest acid in the following:

Which of the following pairs of ions are isoelectronic and isostructural?

Bond dissociation enthalpy of E–H (E = element) bonds is given below. Which of the compounds will act as the strongest reducing agent?

In which of the following cases blood cells will shrink ______.