In which of the following substances can there be:
(a) increase in mass
(b) decrease in mass
(c) no change in mass
When exposed to air?
(1) Sodium chloride (2) Iron (3) Cone. sulphuric acid (4) Table salt (5) Sodium carbonate crystals

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Solution

(a)Increase in mass: Iron(Fe) and conc. Sulphuric acid(H₂SO₄)
Iron and Sulphuric acid when exposed to air, they absorb water vapor from the air because of which their mass increases.
(b)Decrease in mass -: Sodium Carbonate crystals(Na₂CO₃.10H₂O)
Sodium Carbonate crystals when exposed to air, they lose water of crystallization from the air because of which their mass decreases.
(c)No change in mass -: Sodium chloride(NaCl) or Table salt(NaCl).
Sodium chloride when exposed to air, they do not gain or lose water vapor from the air because of which its mass does not change.

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In which of the following substances will there be :

(a) increase in mass

(b) decrease in mass

1. Sodium chloride

2. Iron

3. Conc. sulphuric acid

4. Table salt

5. Sodium carbonate crystals

Q. (a) Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain:
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(ii) Copper sulphate
(iii) Iron (II) sulphate
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Iron
Sodium, Zinc

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Sodium carbonate

(b) From the formulae listed below, choose one, in each case, corresponding to the salt having the given description:
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(i) An acid salt.
(ii) An insoluble chloride.
(iii) On treating with concentrated sulphuric acid, this salt changes from blue to white.
(iv) On heating this salt changes from green to black.
(v) This salt gives nitrogen dioxide on heating.

(b) From the list of substances given below, choose the pair required to prepare the salts (i) to (iii) in the laboratory and write down the relevant equations. The substances are
chlorine, iron, lead, lead nitrate solution, sodium nitrate solution, iron (III) carbonate, lead carbonate, iron (III) hydroxide, sodium hydroxide solution and dilute hydrochloric acid. The salts are
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(ii) lead chloride.
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State whether a sample of each of the following would increase or decrease in mass if exposed to air.

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Q. Classify aqueous solutions of the following substances according to their pH into three groups : 7, more than 7, less than 7.

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In which of the following substances can there be:(a) increase in mass(b) decrease in mass(c) no change in massWhen exposed to air?(1) Sodium chloride (2) Iron (3) Cone. sulphuric acid (4) Table salt (5) Sodium carbonate crystals

In which of the following substances can there be:
(a) increase in mass
(b) decrease in mass
(c) no change in mass
When exposed to air?
(1) Sodium chloride (2) Iron (3) Cone. sulphuric acid (4) Table salt (5) Sodium carbonate crystals