Question

arrange the compounds in increasing in terms of Melting Point and Velocity

H2O, H2S, Br2, NaCl

Answer 1

The gas has lower melting (boiling) point than liquid (ionic compound);

Non-ionic compound has lower boiling point than ionic compound;

So, increasing of Melting Point and Velocity: H₂S (gas) - Br₂(liquid-gas, non-ionic compound) - H₂O(liquid, non-ionic compound) - NaCl(liquid, ionic compound).

Answer: H₂S - Br₂ - H₂O - NaCl.