Answer the questions
Frothing in Yamuna:
The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghat Yamuna's pollution level is so bad that parts of it have been labelled 'dead' as there is no oxygen in it for aquatic life to survive.
1. Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it.
a) 10-11
b) 5-7
c) 2-5
d) 7 4.2
2. Which of the following statements is correct for the water with detergents dissolved in it?
a) low concentration of hydroxide ion (OH-) and high concentration of hydronium ion (H3O+)
b) high concentration of hydroxide ion (OH-) and low concentration of hydronium ion (H3O+)
c) high concentration of hydroxide ion (OH-) as well as hydronium ion (H3O+)
d) equal concentration of both hydroxide ion (OH-) and hydronium ion (H3O+) .
3. The table provides the pH value of four solutions P, Q, R and S
| Solution |
pH value |
| P |
2 |
| Q |
9 |
| R |
5 |
| S |
11 |
Which of the following correctly represents the solutions in increasing order of their hydronium ion concentration?
a) P>Q>R>S
b) P>S>Q>R
c) S<Q<R<P
d) S<P<Q<R
4. High content of phosphate ion in river Yamuna may lead to:
a) decreased level of dissolved oxygen and increased growth of algae
b) decreased level of dissolved oxygen and no effect of growth of algae
c) increased level of dissolved oxygen and increased growth of algae
d) decreased level of dissolved oxygen and decreased growth of algae
5. If a sample of water containing detergents is provided to you, which of the following methods will you adopt to neutralize it?
a) Treating the water with baking soda
b) Treating the water with vinegar
c) Treating the water with caustic soda
d) Treating the water with washing soda
