Questions

 Don’t take it to heart : Mind, the client is not angry with you, they are displeased with the work of your product or for showing the quality of service that you provide. Your personal emotions are beside the factor.

  Find a solution: Once you understand why the purchaser is unhappy, it is time to provide a solution. Ask him what he feels should be completed or put forward your own truthful and realistic solution to the problem. In maximum cases, that’s all the customer is searching out —and may bring about  providing some degree of satisfaction.

Here all the given compounds have both ionic and covalent bonds.

NaNO3 - In Sodium nitrate, Nitrate is covalently bonded as nitrogen is bonded with 3 oxygen atoms. And this nitrate is ionically bonded with sodium.

CaSO4 - In Calcium sulphate, sulphate is covalently bonded as sulphur is bonded with 4 oxygen atoms. And this sulphate is ionically bonded with calcium.

NH4Cl - In Ammonium chloride, ammonium is covalently bonded as nitrogen is bonded with 4 hydrogen atoms. And this ammonium is ionically bonded with chlorine.