Science
50.0 mL of tap water was taken in a beaker. Hydrochloric acid was added drop by drop to water. The temperature and pH of the solution was noted. The following graph was obtained. Choose the correct statements related to this activity.
(i) The process of dissolving an acid in water is highly endothermic.
(ii) The pH of the solution increases rapidly on addition of acid.
(iii) The pH of the solution decreases rapidly on addition of acid.
(iv) The pH of tap water was around 7.0.
- (i) and (ii)
- (i) and (iii)
- (iii) and (iv)
- (ii) and (iv)
Acids Bases Salts
6 Likes
Answer
(iii) and (iv)
Reason — The pH of tap water was around 7.0 because tap water is a neutral solution. On addition of acid to water the heat energy is released hence the reaction is exothermic. The pH of the solution decreases rapidly from 3 to 1 with the addition of acid.
Answered By
3 Likes
Related Questions
The refractive index of medium A is 1.5 and that of medium B is 1.33. If the speed of light in the air is 3 × 108 m/s, what is the speed of light in medium A and B respectively?
(a) 2 × 108 m/s and 1.33 × 108 m/s
(b) 1.33 × 108 m/s and 2 × 108 m/s
(c) 2.25 × 108 m/s and 2 × 108 m/s
(d) 2 × 108 m/s and 2.25 × 108 m/s
An object of height 4 cm is kept at a distance of 30 cm from the pole of a diverging mirror. If the focal length of the mirror is 10 cm, the height of the image formed is
- +3.0 cm
- +2.5 cm
- +1.0 cm
- +0.75 cm
A student, took four metals P, Q, R and S and carried out different experiments to study the properties of metals. Some of the observations were :
- All metals could not be cut with a knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.
- P – Did not react either with cold or hot water but reacted with steam
- Q – Reacted with hot water and the metal started floating
- R – Reacted violently with cold water.
- S – Did not react with water at all
Based on the above observations answer the following:
Out of the given metals, the one which needs to be stored under Kerosene is
- P
- R
- S
- Q
A student, took four metals P, Q, R and S and carried out different experiments to study the properties of metals. Some of the observations were :
- All metals could not be cut with a knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.
- P – Did not react either with cold or hot water but reacted with steam
- Q – Reacted with hot water and the metal started floating
- R – Reacted violently with cold water.
- S – Did not react with water at all
Based on the above observations answer the following:
Out of the given metals, the metal Q is
- Iron
- Zinc
- Potassium
- Magnesium