In which of the following substances will 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. Conc. sulphuric acid
4. Table salt
5. Sodium carbonate crystals

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Solution

a) Increase in mass: Iron and conc. sulphuric acid

b) Decrease in mass: Sodium carbonate crystals

c) No change in mass: Sodium chloride or table salt.

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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

State whether a sample of each of the following would increase or decrease in mass if exposed to air.

(a) Solid NaOH, (b) Solid $C a C l_{2}$ ,

(e) Iron (III) Chloride

Give reasons for the following:
(i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water.
(ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid.
(iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
(iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
(v) Sulphuric acid can form two kinds of salts with sodium chloride.
(vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.
(vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.
(viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid.
(ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.
(x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory.
(xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
(xii) Concentrated sulphuric acid must be stored in airtight bottles.
(xiii) Cotton clothes get burnt with concentrated sulphuric acid.
(xiv) H₂SO₄ cannot be prepared by heating sodium sulphate with conc. HCl or HNO₃.

Q. Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air ?
(i) increase in pressure
(ii) increase in temperature
(iii) decrease in pressure
(iv) decrease in temperature

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

Q. In which of the four substances,will be there
1)increase in weight,
2)decrease in weight,
3)no change in weight when exposed to air?
*(sodium chioride,sodium carbonate crystals,suiphuric acid and iron)

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In which of the following substances will 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. Iron3. Conc. sulphuric acid 4. Table salt5. Sodium carbonate crystals

a) Increase in mass: Iron and conc. sulphuric acidb) Decrease in mass: Sodium carbonate crystalsc) No change in mass: Sodium chloride or table salt.

In which of the following substances will 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. Conc. sulphuric acid
4. Table salt
5. Sodium carbonate crystals

a) Increase in mass: Iron and conc. sulphuric acid

b) Decrease in mass: Sodium carbonate crystals

c) No change in mass: Sodium chloride or table salt.