pH

Q.

Between pH value of 7 to 14, As pH increases:

1. ​ion concentration increases

2. ion concentration decreases

3. pH has no relation with ion concentration.

4. ion concentration remains constant.

Q.

What is the role of a buffer?

Q.

Why is hydrogen fluoride a liquid unlike other hydrogen halides?

Q.

How Do Buffers Maintain pH?

Q.

What is the pH scale?

Q.

Out of the following options, which is the most acidic?

1. 1M

2. 1M HCl

3. CH₃CH₂COOH

4. Both 1M HCl and 1M

Q.

pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement:

Statement 1: Solution X is more basic than solution Y.

Statement 2: Solution Y is more basic than solution X.

Statement 3: Solution Y has more ${OH}^{-}$ ion concentration than solution X.

Statement 4: Solution X has more ${OH}^{-}$ ion concentration than solution Y.

Statement 5: Solution Y has more $H^{+}$ ion concentration than solution X.

Statement 6: Solution X has more $H^{+}$ ion concentration than solution Y.

1. Statement 1, 4 and 6 are correct

2. Statement 1, 4 and 5 are correct

3. Statement 2, 3 and 5 are correct

4. Only statement 1 is correct

Q.

In the formation of electrovalent compounds electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?

Q. ___ has higher pH value. (Dilute HCl or Concentrated HCl)

Q. Write a short note on pH. [2 mark]

Q. Assertion :$pH$ of pure water increases with increase in temperature. Reason: Degree of dissociation of water increases with increase in temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Nature of aqueous solution with pH equal to zero is:

1. neutral
2. acidic
3. amphoteric
4. alkaline

Q.

Define or explain the following terms:

(ii) pH scale

Q. Assertion :pH of a neutral solution is always $7$. Reason: pH of a solution does not depend upon temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. The pH is less than 7 for the solution of:

1. $FeC{l}_3$
2. $NaCN$
3. $NaOH$
4. $NaCl$

Q. Calculate the $pH$ of a solution (nearest integer) obtained by mixing $100ML$ of an acid of $pH=3$ and $400mL$ solution of $pH=1$. Both contain strong acids.

Q. The $pH$ of a solution which turns red litmus blue can be:

1. $1$
2. $9$
3. $4$
4. $5$

Q. You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?
[1 Mark]

Q. The pH values for three different solutions are $13,11$ and $9$. Arrange these pH values in the decreasing order of hydronium or $H^{+}$ ion concentration.

1. $9>11>13$
2. $13>11>9$
3. $9>13>11$
4. $11>13>9$

Q. Four students a, b, c and d measured pH values of water, lemon juice, and sodium bicarbonate solution. What is the correct decreasing order of the pH values?

1. Sodium bicarbonate > water > lemon juice
2. Water > lemon juice > sodium bicarbonate
3. Water > sodium bicarbonate > lemonjuice
4. Lemon juice > water > sodium bicarbonate

Q. The dissociation constant of mono-basic acids A, B and C are ${10}^{-4},{10}^{-6}$ and ${10}^{-10}$ respectively. The concentration of each is 0.1 M. Which of the following has been arranged in order of increasing pH ?

1. $A<B<C$
2. $C<B<A$
3. $C<A<B$
4. $B<A<C$

Q. The pH scale is a measure of ions concentration in a solution.

1. hydrogen
2. hydroxide
3. oxygen

Q. Which of the following has the highest value of pH at the same temperature for the same concentration?

1. $NaOH$
2. $Ca{\left(OH\right)}_2$
3. ${CH}_{3}COOH$
4. $HCl$

Q. Assertion :pH of 10 M $HCl$ aqueous solution is less than 1. Reason: pH is negative logarithm of $H^{+}$ concentration.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Assertion :pH of hydrochloric acid solution is less than that of acetic acid solution of the same concentration. Reason: In equimolar solutions, the number of titrable protons present in hydrochloric acid is less than that present in acetic acid.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Calculate the resultant $pH$ of a solution when $20$ ml of $0.1N$ $NaOH$ os mixed with $20$ ml of $0.05M$ $Ca{\left(OH\right)}_2$ at ${25}^{o}C$.

1. $1$
2. $2$
3. $13$
4. $14$

Q.

The strength of an acid depends on its tendency to:

1. accept protons

2. donate protons

3. accept electrons

4. donate electrons

Q. The $pH$ value of $0.001M$ aqueous solution of $NaCl$ is:

1. $7$
2. $4$
3. unpredictable
4. $11$

Q.

pH of a solution X is 13 and pH of another solution Y is 9. Then choose the correct statement:

Statement 1: Solution X is more basic than solution Y.

Statement 2: Solution Y is more basic than solution X.

Statement 3: Solution Y has more ${OH}^{-}$ ion concentration than solution X.

Statement 4: Solution X has more ${OH}^{-}$ ion concentration than solution Y.

Statement 5: Solution Y has more $H^{+}$ ion concentration than solution X.

Statement 6: Solution X has more $H^{+}$ ion concentration than solution Y.

1. Statement 2, 3 and 5 are correct.
2. Statement 1, 4 and 6 are correct.
3. Statement 1, 4 and 5 are correct.
4. Only statement 1 is correct.

Q. Assertion :A solution with $pH=5$ has a higher concentration of hydronium ions than a solution with a $H=3$
Reason: $pH$ is defines as $-log\left[H^{+}\right]$

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is incorrect but Reason is correct
4. Both Assertion and Reason are incorrect