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.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error