23. The compound which contains both ionic and covalent compound is a)CH4
b) H2
c)KCN
d)KCL

Calcium carbonate is another example of a compound with both ionic and covalent bonds. Here calcium acts as the cation, with the carbonate species as the anion. These species share an ionic bond, while the carbon and oxygen atoms in carbonate are covalently bonded.

D and C

Explanation:

KCl

because potassium ion ( K† ) is ionic and Chloride ion ( Cl- ) is covalent.

also KCN can be an alternative answer because the potassium ion ( K† ) is ionic and Cyanide ion ( CN- ) is covalent.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.