Advertisements
Advertisements
Question
The pH of rainwater is 7.
Solution
False.
The pH of rainwater is less than 7.
APPEARS IN
RELATED QUESTIONS
The colour of universal indicator solution is ____________.
(a) red
(b) blue
(c) green
(d) greenish yellow
Fill in the blank
Magnesia is used in making __________.
A solution 'X' gives orange colour when a drop of it falls on pH paper, while another solution 'Y' gives bluish colour when a drop of it falls on pH paper. What is the nature of both solutions? Determine the pH of solutions 'X' and 'Y'.
Give the tests to identify Acids and Bases.
A solid compound ‘A’ decomposes on heating into ‘B’ and a gas ‘C’. On passing the gas ‘C’ through water, it becomes acidic. Identify A, B, and C.
Tomato is a natural source of which acid?
Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
Tooth enamel is made up of ____________.
What is the pH range of our body?
When copper oxide and dilute hydrochloric acid react, colour changes to ____________.
Ag2S reacts with H2SO4 to form ____________.
Assertion: Carbonic acid is a weak acid.
Reason: It ionised completely in an aqueous solution.
The graph given below depicts a neutralization reaction (acid + alkali → salt + water). The pH of a solution changes as we add an excess acid to an alkali.
Which letter denotes the area of the graph where both acid and salt are present?
Assertion: Fresh milk in which baking soda is added, takes a longer time to set as curd.
Reason: Baking soda decreases the pH value of fresh milk to below 6.
Frothing in Yamuna:
The primary reason behind the formation of the toxic foam is the high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghats, and households. 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.
Predict the pH value of the water of river Yamuna if the reason for froth is the high content of detergents dissolved in it.
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?
Explain the role of pH in our digestive system.
The pH value of neutral solution is ______.
pH stands for ______ in a solution.
The white enamel coating of our teeth is ______.
pH value of human blood is ______.
Define indicator. Give examples
Correct the wrong statement given below:
An acid is the compound which are capable of forming hydroxyl ions (OH– ) in aqueous solution.
Write notes on the importance of pH in everyday life.
A solution turns the colour of turmeric to reddish brown. If the same solution is poured on universal indictor, its colour would change to ______.
Acid present in tomato is ______.
How does Paramecium obtain is food?
Mohan has three solutions P, Q and R having a pH of 13, 5 and 2 respectively. Which of the above solutions P, Q or R will react with magnesium to liberate hydrogen gas?
Mohan has three solutions P, Q and R having a pH of 13, 5 and 2 respectively. Which of the above solutions P, Q or R will liberate ammonia gas when it reacts with ammonium chloride?
Mohan has three solutions P, Q and R having a pH of 13, 5 and 2 respectively. Which of the above solutions P, Q or R will contain molecules as well as ions?
Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.
Which solution will liberate ammonia gas when reacted with ammonium chloride?
