pH of a Solution

Q. What is the pH of acid rain?

Q. Which of the following have the highest pH value?

1. Battery acid
2. Vinegar
3. Soda
4. Water

Q.

A milkman adds a very small amount of baking soda to fresh milk.

Why does he shift the pH of the fresh milk from 6 to slightly alkaline?

Q.

$1\mathrm{gram}$ of a carbonate $\left({\mathrm{M}}_2{\mathrm{CO}}_3\right)$ on treatment with $\mathrm{excess}\mathrm{HCl}$ produces $0.01186\mathrm{moles}$ of ${\mathrm{CO}}_2$. The molar mass of ${\mathrm{M}}_2{\mathrm{CO}}_3$ in $\mathrm{g}{\mathrm{mol}}^{-1}$ is :

1. $118.6$

2. $11.86$

3. $1186$

4. $84.3$

Q. The correct order of ionic radii of following species is Se2-, I-, Br-, F-, O2- .And how?

Q.

Calculate the pH value of 0.01 M HCl.

Q.

A milkman adds a very small amount of baking soda to fresh milk.

Why does this milk take a long time to set as curd?

Q. pH scale is used for measuring _____ ion concentration in a solution.

1. oxygen
2. nitrogen
3. hydrogen
4. chlorine

Q. pH of 1M HA (weak acid) is 2. Hence, vant Hoff factor is____________.

1. 1.2
2. 1.02
3. 1.01
4. 1.1

Q.

Why do strong acids dissociate more?

Q.

Is Borax better than baking soda?

Q.

What are pH indicators?

1. Aqueous solution of either salts of strong acids or strong bases.

2. Aqueous solution either salts of weak acids or weak bases.

3. Aqueous solution of either strong acids or strong bases.

4. Aqueous solution of either weak acids or weak bases.

Q.

Question 07.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish - orange. Which of the following would change the colour of this pH paper to greenish-blue ?

(a) Lemon juice
(b) Vinegar
(c) Common salt
(d) An antacid

Q. $C{H}_{3}COOH$ + NaOH $\to$ $C{H}_{3}COONa$ + $H_{2}O$
The pH of the above reaction will be___.

1. Alkaline
2. Neutral
3. Acidic
4. None of these

Q.

State two periodic properties which are responsible for the formation of an ionic compound.

Q.

Acid rain is formed, when pH of rain water is less than ___ .

Q. Which of the following solutions has the highest $pH$?

1. $0.20MC{H}_{3}COOH$
2. $0.020MHCl$
3. $0.2MHCl{O}_4$
4. $0.2MNaCl$

Q. The pH value of ${10}^{-7}$ M solution $HCl$ is:

1. equal to 1
2. equal to 2
3. less than 7
4. equal to 0

Q. The $p{K}_a$ of acetic acid and $p{K}_b$ of $N{H}_{4}OH$ are $4.76$ and $4.75$. Calculate the $pH$ of ammonium acetate ions.

Q. Which one of the following solutions will have the highest pH value?

1. $0.01M$ $NaOH$
2. $0.02M$ ${CH}_{3}COONa$
3. $0.01M$ $NaH{CO}_3$
4. $0.01M$ $H_2{SO}_4$

Q. Following solutions were prepared by mixing different volumes of $NaOH$ and $HCl$ of different concentrations:

1. $b$
2. $a$
3. $c$
4. $d$

Q. Consider these two equations:

(i) ${\text{Cl}}^{-}+{\text{H}}^{+}\to \text{HCl}\text{(aq)}$
(ii) ${\text{CH}}_3\text{COOH}\text{(aq)}\to {\text{CH}}_3{\text{COO}}^{-}+{\text{H}}^{+}$

Which of the following option(s) is/are correct?

1. ${\text{H}}^{+}$ is a Bronsted-Lowry base
2. ${\text{CH}}_3\text{COOH}$ is a Bronsted-Lowry base
3. ${\text{Cl}}^{-}$ is a Bronsted-Lowry base
4. $\text{HCl}$ is a Bronsted-Lowry base

Q.

Which one is an acidic salt?

1. $N{H}_{4}Cl$

2. $C{H}_{3}COONa$

3. $KCl$

4. $NaCl$

Q. What is the $pH$ of $0.005\left(M\right)H_{2}S{O}_4$ solutions?

1. $3$
2. $4$
3. $2$
4. $5$

Q.

An ionic compound ${\mathrm{AB}}_2$ is formed between a metal and a nonmetal. Write two important physical properties of this compound.

Q. The $pH$ of blood circulating in a human body is maintained around $7.4$ by the action of which buffer system?

1. $C{H}_{3}COOH/C{H}_{3}COONa$
2. $N{H}_{4}Cl/N{H}_3$
3. $H_{2}P{O}_4^{2-}$
4. $H_{2}C{O}_3/HC{O}_3^{-}$

Q. What is the ph of a universal indicator?

Q. Question 2
What effect does the concentration of ${\text{H}}^{+}$ (aq) ions have on the nature of the solution?

Q. What will be the pH of a soft drink if hydrogen ion concentration in sample is $3.8\times {10}^{-3}$ M?

1. $3.8$
2. $5.04$
3. $2.42$
4. $9.2$

Q. Match the following with their respective pH values.

1. 1.6
2. 14
3. 7.4
4. 10