Question

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In which of the following substances will be there be :
a) increase in mass
b) decrease in mass
c) no change in mass when they are exposed to air.

1. sodium chloride
2. iron
3.concentrated sulphuric acid
4.table salt
5.sodium carbonate crystals


Please answer correct , last time I got answer but it was a little wrong , it didn't make any sense​

Answer 1

Answer:

Sodium chloride 2. ... (c) no change in mass when they are exposed to air? 1. ... 2. Iron. 3. Conc. sulphuric acid. 4. Table salt. 5. Sodium carbonate crystals ... b) Decrease in mass: Sodium carbonate crystals.

Answer 2

Answer:

sodium 2. no change in mass when they are exposed to air 2. iron 3. conc sulphuric acid 4. decrease in mass. sodium carbonate crystal