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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 4751. |
In a solution of acetic acid, sodium acetate is added, then its pH value [NCERT 1977; DPMT 1985; MP PMT 1994] |
| A. | Decreases |
| B. | Increases |
| C. | Remains unchanged |
| D. | A and B both are correct |
| Answer» C. Remains unchanged | |
| 4752. |
If the \[pH\] of a solution is 2, its normality will be [MADT Bihar 1982; MP PET 2000] |
| A. | 2N |
| B. | \[\tfrac{1}{2}N\] |
| C. | 0.01 N |
| D. | None of these |
| Answer» D. None of these | |
| 4753. |
The \[pH\] of \[{{10}^{-7}}N\,HCl\] is [RPMT 2000] |
| A. | 6.0 |
| B. | 6.97 |
| C. | 8.0 |
| D. | 10.0 |
| Answer» C. 8.0 | |
| 4754. |
The solution of sodium carbonate has pH [MP PET 2000] |
| A. | Greater than 7 |
| B. | Less than 7 |
| C. | Equal to 7 |
| D. | Equal to zero |
| Answer» B. Less than 7 | |
| 4755. |
pH of a \[{{10}^{-3}}M\] solution of hydrochloric acid will be [MP PET 2000] |
| A. | 1.3 |
| B. | 2.0 |
| C. | 3.0 |
| D. | 4.5 |
| Answer» D. 4.5 | |
| 4756. |
\[pH\]of a solution can be expressed as [CPMT 1999; UPSEAT 2001] |
| A. | \[-{{\log }_{e}}({{H}^{+}})\] |
| B. | \[-{{\log }_{10}}({{H}^{+}})\] |
| C. | \[{{\log }_{e}}({{H}^{+}})\] |
| D. | \[{{\log }_{10}}({{H}^{+}})\] |
| Answer» C. \[{{\log }_{e}}({{H}^{+}})\] | |
| 4757. |
\[50\,\,ml\] water is added to a \[50\,\,ml\] solution of \[Ba{{(OH)}_{2}}\] of strength \[0.01\,\,M.\] The \[pH\] value of the resulting solution will be [MP PMT 1999] |
| A. | 8 |
| B. | 10 |
| C. | 12 |
| D. | 6 |
| Answer» D. 6 | |
| 4758. |
The \[pH\] of solution having \[[O{{H}^{-}}]={{10}^{-7}}\] is [AIIMS 1996] |
| A. | 7 |
| B. | 14 |
| C. | Zero |
| D. | \[-7\] |
| Answer» B. 14 | |
| 4759. |
Amongst the following solutions, the buffer solution is [MP PMT 1999] |
| A. | \[N{{H}_{4}}Cl+N{{H}_{4}}OH\]solution |
| B. | \[N{{H}_{4}}Cl+NaOH\]solution |
| C. | \[N{{H}_{4}}OH+HCl\]solution |
| D. | \[NaOH+HCl\]solution |
| Answer» B. \[N{{H}_{4}}Cl+NaOH\]solution | |
| 4760. |
A buffer solution has equal volumes of \[0.2M\,N{{H}_{4}}OH\] and \[0.02M\,N{{H}_{4}}Cl\]. The \[p{{K}_{b}}\] of the base is 5. The pH is [CBSE PMT 1989; KCET 2005] |
| A. | 10 |
| B. | 9 |
| C. | 4 |
| D. | 7 |
| Answer» B. 9 | |
| 4761. |
Which of the following mixtures forms an acid buffer [MP PMT 1993; IIT 1981; CPMT 1989; CBSE PMT 1989] |
| A. | \[NaOH+HCl\] |
| B. | \[C{{H}_{3}}COOH+C{{H}_{3}}COONa\] |
| C. | \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] |
| D. | \[{{H}_{2}}C{{O}_{3}}+{{(N{{H}_{4}})}_{2}}C{{O}_{3}}\] |
| Answer» C. \[N{{H}_{4}}OH+N{{H}_{4}}Cl\] | |
| 4762. |
An acidic buffer solution can be prepared by mixing solution of [MNR 1983] |
| A. | Ammonium acetate and acetic acid |
| B. | Ammonium chloride and hydrochloric acid |
| C. | Sulphuric acid and sodium sulphate |
| D. | Acetic acid and sulphuric acid |
| E. | \[NaCl\] and \[NaOH\] |
| Answer» B. Ammonium chloride and hydrochloric acid | |
| 4763. |
Given that the dissociation constant for \[{{H}_{2}}O\] is \[{{K}_{w}}=1\times {{10}^{-14}}\] \[mol{{e}^{2}}\,\,litr{{e}^{-2}},\] what is the \[HCl\] of a \[0.001\,\,molar\,\,KOH\]solution [MP PET 1995; MP PET/PMT 1998] |
| A. | \[{{10}^{-11}}\] |
| B. | 3 |
| C. | 14 |
| D. | 11 |
| Answer» E. | |
| 4764. |
When solid potassium cyanide is added in water then [CPMT 2002; BHU 2002] |
| A. | pH will increase |
| B. | pH will decrease |
| C. | pH will remain the same |
| D. | Electrical conductivity will not change |
| Answer» B. pH will decrease | |
| 4765. |
The concentration of \[NaOH\] solution is\[{{10}^{-8}}\,M.\] Find out the \[(O{{H}^{-}})\] concentration [CPMT 1993] |
| A. | \[{{10}^{-8}}\] |
| B. | Greater than \[{{10}^{-6}}\] |
| C. | \[{{10}^{-6}}\] |
| D. | Lies between \[{{10}^{-6}}\]and \[{{10}^{-7}}\] |
| Answer» B. Greater than \[{{10}^{-6}}\] | |
| 4766. |
To obtain a buffer which should be suitable for maintaining a \[pH\]of about \[4-5,\] we need to have in solution, a mixture of |
| A. | A strong base + its salt with a weak acid |
| B. | A weak base + its salt with a strong acid |
| C. | A strong acid + its salt with a weak base |
| D. | A weak acid + its salt with a strong base |
| Answer» E. | |
| 4767. |
A buffer solution contains \[6.4\times {{10}^{-5}}\] of acetic acid and \[0.1\,\,M\] of sodium acetate. What will be its \[pH\], if \[p{{K}_{a}}\]of acetic acid is 4.75 [MP PMT 1996] |
| A. | 4.00 |
| B. | 4.75 |
| C. | 5.00 |
| D. | 5.25 |
| Answer» C. 5.00 | |
| 4768. |
The \[pH\] of 0.05 M solution of dibasic acid is [MH CET 2002] |
| A. | \[+1\] |
| B. | \[-1\] |
| C. | \[+2\] |
| D. | \[-2\] |
| Answer» B. \[-1\] | |
| 4769. |
The \[pH\] of \[{{10}^{-5}}\]M aqueous solution of \[NaOH\]is [MP PET 1996] |
| A. | 5 |
| B. | 7 |
| C. | 9 |
| D. | 11 |
| Answer» D. 11 | |
| 4770. |
\[NaO{{H}_{(aq)}},HC{{l}_{(aq)}}\] and \[NaC{{l}_{(aq)}}\] concentration of each is \[{{10}^{-3}}M\]. Their pH will be respectively [BHU 2003] |
| A. | 10, 6, 2 |
| B. | 11, 3, 7 |
| C. | 10, 2, 6 |
| D. | 3, 4, 7 |
| Answer» C. 10, 2, 6 | |
| 4771. |
The pH of the solution is 4. The hydrogen ion concentration of the solution in mol/litre is [UPSEAT 2000] |
| A. | 9.5 |
| B. | \[{{10}^{-4}}\] |
| C. | \[{{10}^{4}}\] |
| D. | \[{{10}^{-2}}\] |
| Answer» C. \[{{10}^{4}}\] | |
| 4772. |
The \[pH\] of a 0.02 M solution of hydrochloric acid is [MP PMT 1993] |
| A. | 2.0 |
| B. | 1.7 |
| C. | 0.3 |
| D. | 2.2 |
| Answer» C. 0.3 | |
| 4773. |
\[20ml\] of \[0.5N\,HCl\] and \[35\,ml\] of \[0.1N\,NaOH\] are mixed. The resulting solution will [KCET 2005] |
| A. | Be neutral |
| B. | Be basic |
| C. | Turn phenolphthalein solution pink |
| D. | Turn methyl orange red |
| Answer» D. Turn methyl orange red | |
| 4774. |
Hydrogen ion concentration in mol/L in a solution of \[pH=5.4\] will be [AIEEE 2005] |
| A. | \[3.98\times {{10}^{8}}\] |
| B. | \[3.88\times {{10}^{6}}\] |
| C. | \[3.68\times {{10}^{-6}}\] |
| D. | \[3.98\times {{10}^{-6}}\] |
| Answer» E. | |
| 4775. |
The \[p{{K}_{a}}\] of a weak acid is 4.8. What should be the ratio of [Acid]/[Salt] of a buffer if \[pH=5.8\] is required [MP PET 2003] |
| A. | 10 |
| B. | 0.1 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 4776. |
pH of completely dissociated \[0.005\,M\,{{H}_{2}}S{{O}_{4}}\] is [RPET 2003] |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 5 |
| Answer» D. 5 | |
| 4777. |
A solution of \[MgC{{l}_{2}}\] in water has pH [MP PMT 2002] |
| A. | < 7 |
| B. | > 7 |
| C. | 7 |
| D. | 14.2 |
| Answer» B. > 7 | |
| 4778. |
When 10 ml of 0.1 M acetic acid \[(p{{K}_{a}}=5.0)\] is titrated against 10 ml of 0.1M ammonia solution \[(p{{K}_{b}}=5.0)\], the equivalence point occurs at pH [AIIMS 2005] |
| A. | 5.0 |
| B. | 6.0 |
| C. | 7.0 |
| D. | 9.0 |
| Answer» D. 9.0 | |
| 4779. |
What will be the \[pH\]of a \[{{10}^{-8}}\,M\,HCl\] solution [MP PET/PMT 1998; RPET 1999;MP PMT 2000] |
| A. | 8.0 |
| B. | 7.0 |
| C. | 6.98 |
| D. | 14.0 |
| Answer» D. 14.0 | |
| 4780. |
Which on reaction with water will have \[pH\] less than 7 [MH CET 2001] |
| A. | \[BaO\] |
| B. | \[CaO\] |
| C. | \[N{{a}_{2}}O\] |
| D. | \[{{P}_{2}}{{O}_{5}}\] |
| Answer» E. | |
| 4781. |
Highest pH 14 is given by [DCE 1999] |
| A. | \[0.1\,M\,{{H}_{2}}S{{O}_{4}}\] |
| B. | \[0.1\,M\,NaOH\] |
| C. | \[1N\,NaOH\] |
| D. | \[1N\,HCl\] |
| Answer» D. \[1N\,HCl\] | |
| 4782. |
Assuming complete ionisation, the pH of \[0.1\,M\,HCl,\] is 1. The molarity of \[{{H}_{2}}S{{O}_{4}}\] with the same pH is [Pb. PMT 2002] |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.05 |
| D. | 2.0 |
| Answer» B. 0.2 | |
| 4783. |
pH of human blood is 7.4. Then \[{{H}^{+}}\] concentration will be [RPMT 2002] |
| A. | \[4\times {{10}^{-8}}\] |
| B. | \[2\times {{10}^{-8}}\] |
| C. | \[4\times {{10}^{-4}}\] |
| D. | \[2\times {{10}^{-4}}\] |
| Answer» B. \[2\times {{10}^{-8}}\] | |
| 4784. |
The pH of \[0.1\,M\,NaOH\] is [MP PET 2003] |
| A. | 11 |
| B. | 12 |
| C. | 13 |
| D. | 14 |
| Answer» D. 14 | |
| 4785. |
What will be the sum of \[pH\]and \[pOH\] in an aqueous solution ? [MP PET/PMT 1998] |
| A. | 7 |
| B. | \[p{{k}_{w}}\] |
| C. | Zero |
| D. | 1 |
| Answer» C. Zero | |
| 4786. |
By adding a strong acid to the buffer solution, the pH of the buffer solution [DPMT 1996] |
| A. | Remains constant |
| B. | Increases |
| C. | Decreases |
| D. | Becomes zero |
| Answer» B. Increases | |
| 4787. |
What is the pH of \[0.1\,M\,N{{H}_{3}}\] [RPET 2000] |
| A. | 11.27 |
| B. | 11.13 |
| C. | 12.0 |
| D. | 9.13 |
| Answer» C. 12.0 | |
| 4788. |
The hydrogen ion concentration of \[0.1\,N\] solution of \[C{{H}_{3}}COOH,\] which is 30% dissociated, is [JIPMER 2002] |
| A. | 0.03 |
| B. | 3.0 |
| C. | 0.3 |
| D. | 30.0 |
| Answer» B. 3.0 | |
| 4789. |
The pH of the solution containing \[10\,ml\] of a \[0.1\,N\,NaOH\] and \[10\,ml\] of \[0.05\,N\] \[{{H}_{2}}S{{O}_{4}}\] would be [Pb. PMT 2002, 04] |
| A. | 1 |
| B. | 0 |
| C. | 7 |
| D. | > 7 |
| Answer» E. | |
| 4790. |
The \[pH\] of \[{{10}^{-7}}M\,NaOH\] is [MP PMT 2001] |
| A. | 7.01 |
| B. | Between 7 and 8 |
| C. | Between 9 and 10 |
| D. | Greater than 10 |
| Answer» C. Between 9 and 10 | |
| 4791. |
By adding \[20\,ml\] \[0.1\,N\,HCl\] to \[20\,ml\] \[0.001\,N\,\] \[KOH,\] the pH of the obtained solution will be [KCET 2000] |
| A. | 2 |
| B. | 1.3 |
| C. | 0 |
| D. | 7 |
| Answer» C. 0 | |
| 4792. |
pH of a solution of \[10\,ml\]. 1N sodium acetate and \[50\,ml\] 2N acetic acid \[({{K}_{a}}=1.8\times {{10}^{-5}}),\] is approximately [MP PMT 2003] |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» B. 5 | |
| 4793. |
0.1 mole of CH3NH2 (Kb = 5 ´ 10-4) is mixed with 0.08 mole of HCl and diluted to one litre. What will be the H+ concentration in the solution? [IIT 2005] |
| A. | 8 ´ 10-2 M |
| B. | 8 ´ 10-11 M |
| C. | 1.6 ´ 10-11 M |
| D. | 8 ´ 10-5 M |
| Answer» C. 1.6 ´ 10-11 M | |
| 4794. |
Components of buffer solution are \[0.1\,M\,HCN\] and \[0.2\,M\,NaCN\]. What is the pH of the solution [RPET 2000] |
| A. | 9.61 |
| B. | 6.15 |
| C. | 2.0 |
| D. | 4.2 |
| Answer» B. 6.15 | |
| 4795. |
0.02 M monobasic acid dissociates 2% hence, \[pH\] of the solution is [MH CET 2000] |
| A. | 0.3979 |
| B. | 1.3979 |
| C. | 1.699 |
| D. | 3.3979 |
| Answer» E. | |
| 4796. |
A solution has \[pH=5\], it is diluted 100 times, then it will become [NCERT 1978; AFMC 2005] |
| A. | Neutral |
| B. | Basic |
| C. | Unaffected |
| D. | More acidic |
| Answer» B. Basic | |
| 4797. |
1 M \[NaCl\] and 1 M \[HCl\]are present in an aqueous solution. The solution is [AIEEE 2002] |
| A. | Not a buffer solution with pH < 7 |
| B. | Not a buffer solution with pH > 7 |
| C. | A buffer solution with pH < 7 |
| D. | A buffer solution with pH > 7 |
| Answer» B. Not a buffer solution with pH > 7 | |
| 4798. |
Which of the following is the buffer solution of strong acidic nature [MP PET 2002] |
| A. | \[HCOOH+HCO{{O}^{-}}\] |
| B. | \[C{{H}_{3}}COOH+C{{H}_{3}}CO{{O}^{-}}\] |
| C. | \[{{H}_{2}}{{C}_{2}}{{O}_{4}}+{{C}_{2}}O_{4}^{2-}\] |
| D. | \[{{H}_{3}}B{{O}_{3}}+BO_{3}^{3-}\] |
| Answer» B. \[C{{H}_{3}}COOH+C{{H}_{3}}CO{{O}^{-}}\] | |
| 4799. |
The pH value of \[1.0\times {{10}^{-8}}M\,HCl\] solution is less than 8 because |
| A. | \[HCl\] is completely ionised at this concentration |
| B. | The ionization of water is negligible |
| C. | The ionization of water cannot be assumed to be negligible in comparison with this low concentration of \[HCl\] |
| D. | The pH cannot be calculated at such a low concentration of \[HCl\] |
| Answer» D. The pH cannot be calculated at such a low concentration of \[HCl\] | |
| 4800. |
The dissociation constant of an acid HA is \[1\times {{10}^{-5}}\]. The \[pH\] of 0.1 molar solution of the acid will be [KCET (Engg./Med.) 1999] |
| A. | Five |
| B. | Four |
| C. | Three |
| D. | One |
| Answer» D. One | |