MCQOPTIONS
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MCQOPTIONS
This section includes 74 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A mole of liquid can be converted into a mole of gas |
| A. | by increasing the catalyst |
| B. | by breaking the bond energy |
| C. | All of Above |
| D. | by reaching the enthalpy change of vaporization |
| Answer» E. | |
| 2. |
Chemical elements contains only |
| A. | two type of atom |
| B. | one type of atom |
| C. | All of Above |
| D. | atom and molecules |
| Answer» C. All of Above | |
| 3. |
Organic compounds which contains halogens is |
| A. | polyvinyl chloride |
| B. | PVC |
| C. | all of them |
| D. | poly chloro ethene |
| Answer» D. poly chloro ethene | |
| 4. |
Haber process is carried out to synthesize |
| A. | sulfuric acid |
| B. | ammonia |
| C. | none |
| D. | both a and b |
| Answer» C. none | |
| 5. |
The copper which is used for electrical wiring should be pure up to |
| A. | 0.99 |
| B. | 1 |
| C. | 0.98 |
| D. | 0.9999 |
| Answer» E. | |
| 6. |
Aluminum oxide reacts as a base upon reaction with |
| A. | acid |
| B. | water |
| C. | None of Above |
| D. | base |
| Answer» B. water | |
| 7. |
In concentration of gases, the molecules are further apart due to decrease in |
| A. | pressure |
| B. | volume |
| C. | inert |
| D. | density |
| Answer» B. volume | |
| 8. |
Due to extensive hydrogen bonding water has higher |
| A. | boiling point |
| B. | enthalpy change |
| C. | freezing point |
| D. | both a and b |
| Answer» E. | |
| 9. |
Ethanoic acid is present in |
| A. | orange |
| B. | lemon |
| C. | none |
| D. | vinegar |
| Answer» E. | |
| 10. |
Number of faradays required to discharge 1 mole of an ion is equal to charge on that ion is |
| A. | Faraday's second law |
| B. | Faraday's first law |
| C. | none |
| D. | both a and b |
| Answer» B. Faraday's first law | |
| 11. |
Half reaction occur in fuel cell of |
| A. | hydrogen |
| B. | oxygen |
| C. | nitrogen |
| D. | hydrogen -oxygen |
| Answer» E. | |
| 12. |
An dye which changes color over a specific ph range is |
| A. | reactant |
| B. | acid-base indicator |
| C. | product |
| D. | catalyst |
| Answer» C. product | |
| 13. |
The decrease in force of attraction is due to |
| A. | shielding effect increases |
| B. | distance increases |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 14. |
The water passing through rocks of calcium carbonate produces |
| A. | stalagmites |
| B. | stalactites |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 15. |
Which of these metals react vigorously with cold water to produce a strong alkaline solution? |
| A. | Mg(s) |
| B. | Na(s) |
| C. | S(s) |
| D. | Al(s) |
| Answer» C. S(s) | |
| 16. |
A needle float on water, upon adding detergent to water needle will |
| A. | sink |
| B. | float |
| C. | stay still |
| D. | float longer |
| Answer» B. float | |
| 17. |
If the water coming in the reservoir becomes equal to water going out of it will be called as it is in |
| A. | translocated |
| B. | equilibrium |
| C. | constant |
| D. | equal |
| Answer» C. constant | |
| 18. |
Some hydroxides of transition metals are weak bases along with |
| A. | amines |
| B. | ammonia |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 19. |
Solids are mostly denser than |
| A. | gases |
| B. | liquids |
| C. | alkalis |
| D. | noble gases |
| Answer» C. alkalis | |
| 20. |
Chemical equilibrium is dynamic in nature because [IIT 1977] |
| A. | Equilibrium is maintained rapidly |
| B. | The concentration of reactants and products become same at equilibrium |
| C. | The concentration of reactants and products are constant but different |
| D. | Both forward and backward reactions occur at all times with same speed |
| Answer» D. Both forward and backward reactions occur at all times with same speed | |
| 21. |
In chemical reaction \[A\]⇌\[B\], the system will be known in equilibrium when [MP PMT 1990; NCERT 1977] |
| A. | A completely changes to B |
| B. | 50% of A changes to B |
| C. | The rate of change of A to B and B to A on both the sides are same |
| D. | Only 10% of A changes to B |
| Answer» D. Only 10% of A changes to B | |
| 22. |
An example for a strong electrolyte is[KCET 2002] |
| A. | Urea |
| B. | Ammonium hydroxide |
| C. | Sugar |
| D. | Sodium acetate |
| Answer» E. | |
| 23. |
Concentration \[C{{N}^{-}}\] in \[0.1\,M\,HCN\] is\[[{{K}_{a}}=4\times {{10}^{-10}}]\] [RPET 2000] |
| A. | \[2.5\times {{10}^{-6}}M\] |
| B. | \[4.5\times {{10}^{-6}}M\] |
| C. | \[6.3\times {{10}^{-6}}M\] |
| D. | \[9.2\times {{10}^{-6}}M\] |
| Answer» D. \[9.2\times {{10}^{-6}}M\] | |
| 24. |
0.2 molar solution of formic acid is ionized 3.2%. Its ionization constantis[MP PMT 1991] |
| A. | \[1\times {{10}^{-12}}\] |
| B. | \[2.1\times {{10}^{-4}}\] |
| C. | \[1.25\times {{10}^{-6}}\] |
| D. | \[1\times {{10}^{-14}}\] |
| Answer» C. \[1.25\times {{10}^{-6}}\] | |
| 25. |
Ammonium hydroxide is a weak base because [MP PET 2000] |
| A. | It has low vapour pressure |
| B. | It is only slightly ionized |
| C. | It is not a hydroxide of any metal |
| D. | It has low density |
| Answer» C. It is not a hydroxide of any metal | |
| 26. |
The following equilibrium exists inaqueous solution, \[C{{H}_{3}}COOH\]⇄\[C{{H}_{3}}CO{{O}^{-}}+{{H}^{+}}\] if dil HCl is added, without change in temperature, the [UPSEAT 2000, 02] |
| A. | Concentration of \[C{{H}_{3}}CO{{O}^{-}}\] will increase |
| B. | Concentration of \[C{{H}_{3}}CO{{O}^{-}}\] will decrease |
| C. | The equilibrium constant will increase |
| D. | The equilibrium constant will decrease |
| Answer» C. The equilibrium constant will increase | |
| 27. |
The equivalent conductance at infinite dilution of a weak acid such as \[HF\] [Pb. PMT 1998] |
| A. | Can be determined by measurement of very dilute \[HF\] solution |
| B. | Can be determined by extrapolation of measurements on dilute solutions of \[HCl,\,\,HBr\] and \[HI\] |
| C. | Can best be determined from measurements on dilute solutions of \[NaF,\,\,NaCl\] and \[HCl\] |
| D. | Is an undefined quantity |
| Answer» B. Can be determined by extrapolation of measurements on dilute solutions of \[HCl,\,\,HBr\] and \[HI\] | |
| 28. |
In the given reaction, the oxide of sodium is ?.\[\left[ \begin{matrix} 4Na+{{O}_{2}}\to 2N{{a}_{2}}O\\ N{{a}_{2}}O+{{H}_{2}}O\to 2NaOH\\ \end{matrix} \right]\] [Orissa JEE 2002] |
| A. | Acidic |
| B. | Basic |
| C. | Amphoteric |
| D. | Neutral |
| Answer» C. Amphoteric | |
| 29. |
The Bronsted acids in the reversible reaction are \[HCO_{3}^{-}(aq.)+O{{H}^{-}}(aq.)\,\]⇄\[CO_{3}^{2-}(aq.)+{{H}_{2}}O\] [DPMT 2002] |
| A. | \[O{{H}^{-}}\] and \[CO_{3}^{2-}\] |
| B. | \[O{{H}^{-}}\] and \[{{H}_{2}}O\] |
| C. | \[HCO_{3}^{-}\] and \[{{H}_{2}}O\] |
| D. | \[HCO_{3}^{-}\] and \[CO_{3}^{2-}\] |
| Answer» D. \[HCO_{3}^{-}\] and \[CO_{3}^{2-}\] | |
| 30. |
0.1 mole of \[{{N}_{2}}{{O}_{4(g)}}\] was sealed in a tube under one atmospheric conditions at 25°C. Calculate the number of moles of \[N{{O}_{2(g)}}\] present, if the equilibrium \[{{N}_{2}}{{O}_{4(g)}}\]⇌\[2N{{O}_{2(g)}}\] \[({{K}_{p}}=0.14)\] is reached after some time [UPSEAT 2001] |
| A. | \[1.8\ \times \ {{10}^{2}}\] |
| B. | \[2.8\ \times \ {{10}^{2}}\] |
| C. | 0.034 |
| D. | \[2.8\ \times \ {{10}^{-2}}\] |
| Answer» D. \[2.8\ \times \ {{10}^{-2}}\] | |
| 31. |
The pH of pure water or neutral solution at \[50{}^\circ C\] is ?. \[(p{{K}_{w}}=13.26\]\[=13.26\] at \[50{}^\circ C)\] [Pb. PMT 2002; DPMT 2002] |
| A. | 7 |
| B. | 7.13 |
| C. | 6 |
| D. | 6.63 |
| Answer» E. | |
| 32. |
The hydrogen ion concentration of a \[0.006\,\,M\] benzoic acid solution is \[({{K}_{a}}=6\times {{10}^{-5}})\] [MP PET 1994] |
| A. | \[0.6\times {{10}^{-4}}\] |
| B. | \[6\times {{10}^{-4}}\] |
| C. | \[6\times {{10}^{-5}}\] |
| D. | \[3.6\times {{10}^{-4}}\] |
| Answer» C. \[6\times {{10}^{-5}}\] | |
| 33. |
For a weak acid \[HA\] with dissociation constant\[{{10}^{-9}},\,\,pOH\] of its 0.1 M solution is [CBSE PMT 1989] |
| A. | 9 |
| B. | 3 |
| C. | 11 |
| D. | 10 |
| Answer» E. | |
| 34. |
The values of \[{{K}_{sp}}\]for \[CuS,\,\,A{{g}_{2}}S\] and \[HgS\] are \[{{10}^{-31}},\,{{10}^{42}}\] and \[{{10}^{-54}}\] respectively. The correct order of their solubility in water is [MP PMT 2003] |
| A. | \[A{{g}_{2}}S>HgS>CuS\] |
| B. | \[HgS>CuS>A{{g}_{2}}S\] |
| C. | \[HgS>A{{g}_{2}}S>CuS\] |
| D. | \[A{{g}_{2}}S>CuS>HgS\] |
| Answer» E. | |
| 35. |
The molar solubility \[(mol\ {{L}^{-1}})\] of a sparingly soluble salt \[M{{X}_{4}}\] is \['s'\]. The corresponding solubility product is \[{{K}_{sp}}\]. \['s'\]is given in terms of \[_{{{K}_{sp}}}\]by the relation[AIEEE 2004] |
| A. | \[s={{(256{{K}_{sp}})}^{1/5}}\] |
| B. | \[s={{(128{{K}_{sp}})}^{1/4}}\] |
| C. | \[s={{({{K}_{sp}}/128)}^{1/4}}\] |
| D. | \[s={{({{K}_{sp}}/256)}^{1/5}}\] |
| Answer» E. | |
| 36. |
Solubility of \[16\times {{10}^{-4}}\,m/s\] at \[{{20}^{o}}C\]is \[1.435\times {{10}^{-3}}gm\,per\,litre\]. The solubility product of \[AgCl\] is [CPMT 1989; BHU 1997; AFMC 2000; CBSE PMT 2002] |
| A. | \[C{{O}_{2}}\] |
| B. | \[1\times {{10}^{-10}}\] |
| C. | \[1.435\times {{10}^{-5}}\] |
| D. | \[108\times {{10}^{-3}}\] |
| Answer» C. \[1.435\times {{10}^{-5}}\] | |
| 37. |
One litre of water contains \[{{10}^{-7}}mole\]hydrogen ions. The degree of ionization in water will be [CPMT 1985, 88, 93] |
| A. | \[1.8\times {{10}^{-7}}%\] |
| B. | \[0.8\times {{10}^{-9}}%\] |
| C. | \[3.6\times {{10}^{-7}}%\] |
| D. | \[3.6\times {{10}^{-9}}%\] |
| Answer» B. \[0.8\times {{10}^{-9}}%\] | |
| 38. |
What is \[[{{H}^{+}}]\] of a solution that is \[0.01\,M\] in \[HCN\]and \[0.02\,M\] in \[NaCN\] \[({{K}_{a}}\]for \[HCN=6.2\times {{10}^{-10}})\][MP PMT 2000] |
| A. | \[3.1\times {{10}^{10}}\] |
| B. | \[6.2\times {{10}^{5}}\] |
| C. | \[6.2\times {{10}^{-10}}\] |
| D. | \[3.1\times {{10}^{-10}}\] |
| Answer» E. | |
| 39. |
Ammonia under a pressure of 15 atm at 27°C is heated to 347°C in a closed vessel in the presence of a catalyst. Under the conditions, \[N{{H}_{3}}\] is partially decomposed according to the equation, \[2N{{H}_{3}}\]⇌ \[{{N}_{2}}+3{{H}_{2}}\].The vessel is such that the volume remains effectively constant whereas pressure increases to 50 atm. Calculate the percentage of \[N{{H}_{3}}\] actually decomposed. [IIT 1981; MNR 1991; UPSEAT 2001] |
| A. | 0.65 |
| B. | 0.613 |
| C. | 0.625 |
| D. | 0.64 |
| Answer» C. 0.625 | |
| 40. |
What is the solubility of calcium fluoride in a saturated solution, if its solubility product is \[3.2\times {{10}^{-11}}\] [CPMT 1997] |
| A. | \[2.0\times {{10}^{-4}}\,mole/litre\] |
| B. | \[12.0\times {{10}^{-3}}\,mole/litre\] |
| C. | \[0.2\times {{10}^{-4}}\,mole/litre\] |
| D. | \[2\times {{10}^{-3}}\,mole/litre\] |
| Answer» B. \[12.0\times {{10}^{-3}}\,mole/litre\] | |
| 41. |
Solubility of \[M{{X}_{2}}\] type electrolyte is \[0.5\times {{10}^{-4}}mole/litre\]. The value of \[{{K}_{sp}}\] of the electrolyte is [CBSE PMT 2002] |
| A. | \[5\times {{10}^{-13}}\] |
| B. | \[25\times {{10}^{-10}}\] |
| C. | \[1.25\times {{10}^{-13}}\] |
| D. | \[5\times {{10}^{12}}\] |
| Answer» B. \[25\times {{10}^{-10}}\] | |
| 42. |
The solubility product of \[BaS{{O}_{4}}\] at \[25{}^\circ C\] is \[1.0\times {{10}^{-9}}\]. What would be the concentration of \[{{H}_{2}}S{{O}_{4}}\] necessary to precipitate \[BaS{{O}_{4}}\] from a solution of \[0.01\,M\,B{{a}^{2+}}\]ions [RPMT 1999] |
| A. | \[{{10}^{-9}}\] |
| B. | \[{{10}^{-8}}\] |
| C. | \[{{10}^{-7}}\] |
| D. | \[{{10}^{-6}}\] |
| Answer» D. \[{{10}^{-6}}\] | |
| 43. |
An aqueous solution of \[C{{H}_{3}}COONa\] will be [MP PET 2001] |
| A. | Acidic |
| B. | Alkaline |
| C. | Neutral |
| D. | None of these |
| Answer» C. Neutral | |
| 44. |
Solubility product for salt \[A{{B}_{2}}\] is \[4\times {{10}^{-12}}\]. Calculate solubility[RPET 2003] |
| A. | \[1\times {{10}^{-3}}gm\,\,mol\,/\,litre\] |
| B. | \[1\times {{10}^{-5}}gm\,\,mol\,/\,litre\] |
| C. | \[1\times {{10}^{-4}}gm\,\,mol\,/\,litre\] |
| D. | \[1\times {{10}^{-2}}gm\,\,mol\,/\,litre\] |
| Answer» D. \[1\times {{10}^{-2}}gm\,\,mol\,/\,litre\] | |
| 45. |
The precipitate of\[Ca{{F}_{2}}\]\[({{K}_{sp}}=1.7\times {{10}^{-10}})\] is obtained when equal volumes of the following are mixed [IIT 1992; UPSEAT 2000] |
| A. | \[{{10}^{-4}}M\,C{{a}^{2+}}+{{10}^{-4}}M\,{{F}^{-}}\] |
| B. | \[{{10}^{-2}}M\,C{{a}^{2+}}+{{10}^{-3}}M\,{{F}^{-}}\] |
| C. | Both |
| D. | None of these |
| Answer» C. Both | |
| 46. |
Which is a basic salt [MP PMT 1985] |
| A. | \[PbS\] |
| B. | \[PbC{{O}_{3}}\] |
| C. | \[PbS{{O}_{4}}\] |
| D. | \[2PbC{{O}_{3}}.Pb{{(OH)}_{2}}\] |
| Answer» E. | |
| 47. |
Hydrolysis of sodium acetate will give [MNR 1978] |
| A. | Acidic solution |
| B. | Basic solution |
| C. | Neutral solution |
| D. | Normal solution |
| Answer» C. Neutral solution | |
| 48. |
At 298 K, the solubility product of \[PbC{{l}_{2}}\] is \[1.0\times {{10}^{-6}}\]. What will be the solubility of \[PbC{{l}_{2}}\]in moles/litre [MP PMT 1990; CPMT 1985, 96] |
| A. | \[6.3\times {{10}^{-3}}\] |
| B. | \[1.0\times {{10}^{-3}}\] |
| C. | \[3.0\times {{10}^{-3}}\] |
| D. | \[4.6\times {{10}^{-14}}\] |
| Answer» B. \[1.0\times {{10}^{-3}}\] | |
| 49. |
In a saturated solution of electrolyte, the ionic product of their concentration are constant at constant temperature and this constant for electrolyte is known as [CPMT 1983] |
| A. | Ionic product |
| B. | Solubility product |
| C. | Ionization constant |
| D. | Dissociation constant |
| Answer» C. Ionization constant | |
| 50. |
0.5 M ammonium benzoate is hydrolysed to 0.25 percent, hence its hydrolysis constant is[MH CET 2004] |
| A. | \[2.5\times {{10}^{-5}}\] |
| B. | \[1.5\times {{10}^{-4}}\] |
| C. | \[3.125\times {{10}^{-6}}\] |
| D. | \[6.25\times {{10}^{-4}}\] |
| Answer» D. \[6.25\times {{10}^{-4}}\] | |