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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Match the columns:Column ‘A’Column ‘B’(1) HNO3(a) Acetic acid(2) H3PO4(b) Carbonic acid(3) CH3COOH(c) Phosphoric acid(4) H2CO3(d) Nitric acid |
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Answer» (1) NH4OH - (d) Ammonium Hydroxide (2) Ca(OH)2 - (c) Calcium Hydroxide (3) Al(OH)3 - (a) Aluminium Hydroxide (4) Ba(OH)2 - (b) Barium Hydroxide |
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| 52. |
On mixing the substances as shown here, what are the resulting mixtures formed by mixing the following substances called?(a) Water and salt (b) Water and sugar (c) Water and sand (d) Water and sawdust |
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Answer» (a) Water and salt – Homogeneous mixture (b) Water and sugar – Homogeneous mixture (c) Water and sand – Heterogeneous mixture (d) Water and sawdust – Heterogeneous mixture |
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| 53. |
Which of the following solutions has pH greater than 7 ?A) CH3COOHB) NH4Cl C) NaCl D) CH3COONa |
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Answer» Correct option is D) CH3COONa |
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| 54. |
Which one of the following produces more OH ions ? A) HCl solution B) CH3COOH solution C) NH4OH solution D) NaOH solution |
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Answer» D) NaOH solution |
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| 55. |
Dissociation of ions in aqueous acetic acid is reversible process because it is a A) weak acid B) strong, acid C) weak base D) strong base |
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Answer» Correct option is A) weak acid |
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| 56. |
Mixing of an acid or base with water result in decrease in the concentration of HO/OH per unit volume is calledA) hydrationB) dehydrationC) hydrolysisD) dilution |
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Answer» Correct option is D) dilution |
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| 57. |
What is pH scale? |
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Answer» 1. In 1909, the Danish scientist Sorensen introduced a convenient new scale of expressing H+ ion concentration which is found to be useful in chemical and biochemical processes. 2. It is the pH scale (pH: power of hydrogen). The pH scale extends from 0 to 14. According to this scale pure water has a pH of 7. pH 7 indicates a neutral solution. This pH is the midpoint of the scale. 3. The pH of an acidic solution is less than 7. |
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| 58. |
Give examples to show that proportions of H+ and OH- ions in aqueous solution determines the properties of those solutions. |
Answer»
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| 59. |
Which among the following pairs of bases does not decompose on heating?A. Calcium hydroxide, potassium hydroxideB. Sodium hydroxide, potassium hydroxideC. Copper hydroxide, calcium hydroxideD. Sodium hydroxide, copper hydroxide |
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Answer» Correct Answer - B Sodium hydroxide and potassium hydroxide do not decompose on heating. |
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| 60. |
For the formation of normal salt from one molecule of `H_(2)SO_(4)`, how many molecules of NaOH are required?A. OneB. TwoC. FourD. Three |
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Answer» Correct Answer - B `H_(2)SO_(4) + 2NaOH rarr Na_(2)SO_(4) + 2H_(2)O` |
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| 61. |
Identify weak mineral acid among the following.A. Palmitic acidB. Acetic acidC. Carbonic acidD. Hydrochloric acid |
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Answer» Correct Answer - C Carbonic acid is a weak mineral acid |
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| 62. |
Dibasic weak mineral acid among the following isA. acetic acidB. sulphurous acidC. phosphoric acidD. sulphurous acid |
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Answer» Correct Answer - D The acids which are obtained from the minerals present in earth are called mineral acids. Weak acid is the acid in which less than 30% molecules ionize in water. Dibasic acid is the one which furnishes two `H^(+)` ions by one molecule of an acid. And hence `H_(2)SO_(3)` is a dibasic weak mineral acid. |
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| 63. |
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 baseA. (i) and (iii)B. (ii) and (iii)C. (i) and (iv)D. (ii) and (iv) |
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Answer» Correct Answer - D Statement (ii) and (iv) are correct. |
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| 64. |
`S^(-2)` is the conjugate base of `HS^(-)` |
| Answer» Correct Answer - 1 | |
| 65. |
Which of the following is not a mineral acid?A. hydrochloric acidB. Citric acidC. Sulphuric acidD. Nitric acid |
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Answer» Correct Answer - B Citric acid is an organic acid present in citrus fruits. It is not a minerly acid. |
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| 66. |
Which of the following is not base ?A. NaOHB. KOHC. `NH_(4)OH`D. `C_(2)H_(5)OH.` |
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Answer» Correct Answer - D Ethyl alcohol `(C_(2)H_(5)OH)` is not a base. It is an alcohol and is very weakly acidic in nature. |
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| 67. |
Which of the following statements is not correct ?A. All metal carbonates react with acid to give a salt, water and carbon dioxideB. All metal oxides react with water to give salt and acidC. Some metals react with acids to give salt and hydrogenD. Some non metal oxides react with water to form an acid |
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Answer» Correct Answer - B The statement is not correct as the metal oxide reacts with water to form metal hydroxide. |
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| 68. |
Which among the following is the application of neutralization?A. Farmers add slaked lime to soil.B. Persons suffering from acidity are given antacid tablets.C. Usage of lithium hydroxide in submarines.D. All of above. |
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Answer» Correct Answer - D The process due to which an acid completely reacts with a base to form salt and water as the only products is called neutralization. Add slaked lime to soil to neutralize the acidity of the soil. Persons suffering from acidity are given antacid tablets like `Mg(OH)_(2)` to neutralize acidity. Submariners in submarine and astronauts in spaceships, use lithium hudroxide to neutralize `CO_(2)` which is exhaled. |
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| 69. |
Name the acid which is produced by the sting of an ant. |
| Answer» Formic acid is produced by the sting of an ant. | |
| 70. |
Match the chemical substances given in column I with their appropriate application given in column II A. `1-(ii), 2-(i), 3-(iv), 4-(iii)`B. `1-(iii), 2-(ii), 3-(iv), 4-(i)`C. `1-(iii), 2-(iv), 3-(i), 4-(ii)`D. `1-(ii), 2-(iv), 3-(i), 4-(iii)` |
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Answer» Correct Answer - C `1-(iii), 2-(iv), 3-(i), 4-(ii)` |
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| 71. |
Match the chemical substances given in column I with their appropriate applocation given in column II A. `{:(A,B,C,D),(2,1,4,3):}`B. `{:(A,B,C,D),(3,2,4,1):}`C. `{:(A,B,C,D),(3,4,1,2):}`D. `{:(A,B,C,D),(2,4,1,3):}` |
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Answer» Correct Answer - C Bleaching powder bleaches the clothes and other coloured substances baking soda is a constituent of antiacid washing soda is used I the preparation of glass and sodium chloride when subjected to electrolyeses gives `H_(2) and CI_(2)` gases. |
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| 72. |
Name the acid presnet in ant sting and give its chemical formula . Also give the common method to get relief from the dioscomformt caused by the ant sting. |
| Answer» Formic acid (or methanioic aid) is present in the ant sting. The chemicl formula is HCOOH. By applying some wet baking soda on the affected area , it gives relief. | |
| 73. |
Which metal reacts with both acids and baseA. ZincB. AluminiumC. Both A & BD. None |
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Answer» Correct Answer - C |
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| 74. |
Which of the following statement is true for acids?A. Bitter and change red litmus to blueB. Sour and change red litmus to blueC. Sour change blue litmus to redD. Bitter and change blue litmus to red |
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Answer» Correct Answer - C Both are the characteristics of acids. |
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| 75. |
Which of the following statement is true for acids?A. Bitter and change red litmus to blueB. sour and change red litmus to blueC. sour and change blue litmus to redD. Bitter and change blue litmus to red |
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Answer» Correct Answer - C Acids are those chemical substances which have a sour taste and turn blue litmus soltuon to red. On the other hand bases are bitter in taste and soapy to touch and turn red litmus soltuion to blue. |
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| 76. |
A milkman adds a very small amount of baking soda to fresh milk. (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?(b) Why does this milk take a long time to set as curd? |
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Answer» (a) The milkman shifts the pH of the fresh milk from 6 to slightly alkaline because in alkaline condition, milk does not set as curd easily. (b) Since this milk is slightly basic than usual milk, acids produced to set the curd are neutralized by the base. Therefore, it takes a longer time for the curd to set. |
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| 77. |
Lemon juice is _____ in nature. |
| Answer» Correct Answer - acidic | |
| 78. |
Reagents that seek to react with a proton or some other electron-deficient center are called........... |
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Answer» Reagents that seek to react with a proton or some other electron-deficient center are called nucleophiles. |
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| 79. |
Which combination of reagents is the least effective in generating sodium ethoxide, CH3CH2ONa? (A) CH3CH2OH + NaH (B) CH3CH2OH + NaNH2 (C) CH3CH2OH + NaOH (D) CH3CH2OH + CH3Li (E) CH3CH2OH + HC≡CN |
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Answer» CH3CH2OH + NaO combination of reagents is the least effective in generating sodium ethoxide, CH3CH2ONa. |
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| 80. |
Which combination of reagents is effective in generating sodium ethoxide, CH3CH2ONa? (A) CH3CH2OH + KH (B) CH3CH2OH + NaNH2 (C) CH3CH2OH + Na (D) Two of the above (E) All of the above |
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Answer» (E) All of the above |
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| 81. |
What compounds are produced when sodium nitrate is added to a mixture of water and ethanol? (A) HNO3 + NaOH (B) HNO3 + CH3CH2ONa (C) NaOH + CH3CH2ONa (D) CH3CH2OCH2CH3 + NaOH (E) No reaction occur |
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Answer» (E) No reaction occurs. |
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| 82. |
What is the formula of plaster of Paris? |
| Answer» Formula of plaster of Paris is `CaSO_(4)*(1)/(2)H_(2)O` | |
| 83. |
Among the following, which substance turns phenolphthalein pink ?A. Soda waterB. Lime waterC. Commin saltD. Sugar solution |
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Answer» Correct Answer - B Since lime water is basic in nature it turns phenolphthalein pink. |
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| 84. |
Blue coloured solid anhydrous cobalt chloride is exposed to atmosphere and forms pink coloured solid. From this, we can infer that cobalt chloride isA. hygroscopicB. deliquescentC. efflorescentD. None of these |
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Answer» Correct Answer - A Cobalt chloride is a hygroscopic substance and hence absorbs moisture and forms pink coloured hydrated cobalt chloride without undergoing any change in its state. |
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| 85. |
Addition reactions are characteristic of compounds with............ |
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Answer» Addition reactions are characteristic of compounds with multiple bonds. |
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| 86. |
What prediction can be made of the relative strengths of the conjugate bases of: H2S, HCl, SiH4, PH3? (A) PH2- > SiH3-> HS- > Cl-(B) SiH3- > PH2- > HS- > Cl-(C) Cl- > HS- > PH2- > SiH3- (D) HS- > Cl- > SiH3- > PH2-(E) Cl- > PH2- > SiH3- > HS- |
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Answer» (B) SiH3- > PH2- > HS- > Cl- |
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| 87. |
When drawing mechanisms,chemists generally use curved arrows.The curved arrow begins with...................and points toward ............... |
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Answer» When drawing mechanisms,chemists generally use curved arrows.The curved arrow begins with a lone pair or covalent bond and points toward a site of electron deficiency. |
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| 88. |
The four basic types of reactions are:............. |
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Answer» The four basic types of reactions are substitution, addition, elimination, rearrangement. |
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| 89. |
You are planning to carry out a reaction between propyne,CH3CCH and sodium amide,NaNH2.You also need to choose an appropriate solvent for carrying out the reaction.Would ethanol be suitable for this purpose? Explain your rationale clearly. |
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Answer» No, ethanol would be unsuitable for carrying out the reaction between propyne and methyllithium. The pKa of ethanol is ~16,and sodium amide is strong enough a base to readily abstract a proton from the solvent (pKa of NH3 is ~38); in doing so,it becomes deactivated and is no longer available to react with propyne (pKa ~25).Typically, the selected solvent should be chemically inert toward all substances used in the reaction, so that it does not interfere with the desired reaction. |
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| 90. |
Bond polarization that takes place through space and through the bonds of the molecule is called the............ |
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Answer» Bond polarization that takes place through space and through the bonds of the molecule is called the inductive effect. |
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| 91. |
What are the two fundamental types of energy? |
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Answer» Potential energy and kinetic energy are the two fundamental types of energy. |
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| 92. |
Define a protic solvent. |
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Answer» One that has a hydrogen atom attached to a strongly electronegative element such as oxygen. |
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| 93. |
Which of the following classes of substances cannot be used as protic solvents? (A) esters (B) aldehydes (C) ketones (D) carboxylic acids (E) two of the above |
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Answer» Two of the above classes of substances cannot be used as protic solvent. |
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| 94. |
Which might be used as protic solvent? |
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Answer» The Correct option is (B) |
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| 95. |
Arrange the following equations in the correct sequence to obtain a normal salt. (a) `A1(OH)C1_(2) + HCI rarr A1C1_(3) + H_(2)O` (b) `A1(OH)_(3) + HC1 rarr A1(OH)_(2)C1 + H_(2)O` (c) `A1(OH)_(2)C1 + HC1 rarr A1(OH)C1_(2) + H_(2)O`A. cbaB. bcaC. abcD. cab |
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Answer» Correct Answer - B (i) `AI(OH)_(3) + HCI rarr AI(OH)_(2)CI + H_(2)O` (ii) `AI(OH)_(2)CI + HCI rarr AI(OH)CI_(2) + H_(2)O` (iii) `AI(OH)CI_(2) + HCI rarr AICI_(3) + H_(2)O` |
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| 96. |
Observe the given figure carefully, which represents the decomposition of brine solution by passing electricity. |
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Answer» The Correct option is (D) |
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| 97. |
Which reaction of these potential acids and bases does not occur to any appreciable degree due to an unfavorable equilibrium? (A) NaNH2 + CH3CH2CH2CH2CH2CH3 (B) CH3CH2CO2Na + HI (C) CH3Li in hexane + ethyne (D) NaH + methanol (E) Two of the above will not occur |
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Answer» NaNH2 + CH3CH2CH2CH2CH2CH3 does not occur to any appreciable degree due to an unfavorable equilibrium. |
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| 98. |
Which of these phosphorus-based acids is dibasic? |
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Answer» The Correct option is (B) |
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| 99. |
Calcium phosphate is present in tooth enamel. Its nature isA. basicB. acidicC. neturalD. amphoteric |
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Answer» Correct Answer - A `Ca_(3)(PP_(4))` is a salt of strong base `Ca(OH)_(2)` and comparatively a weak acid `H_(3)PO_(4).` |
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| 100. |
Calcium phosphate is present in tooth enamel. Its nature isA. basicB. acidicC. neutralD. amphoteric |
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Answer» Correct Answer - A Calcium phosphate `Ca_(3)(PO_(4))_(2)` is basic salt as it is a salt of weak acid (phosphoric acid) and slightyl stonger abse (Calcium hydroixde) (though both are weak ) . Also when pH of out mouth falls below 5.5 dure to eting of sweets etc i.e mouth is acidic ithe dissolution of ename (Calcium phosphate) starts which shown that calcium phosphate is basic in nature. |
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