MCQOPTIONS
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MCQOPTIONS
This section includes 95 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Calcium hydroxide (slaked lime) is used in: |
| A. | plastics and dyes |
| B. | fertilizers |
| C. | X is a metal and Y is basic oxide. |
| D. | whitewashing |
| Answer» E. | |
| 52. |
Which of the following is an organic acid? |
| A. | Acetic acid |
| B. | Tartaric acid |
| C. | Turmeric |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 53. |
Substances whose solutions do not change the colour of any indicator in any way are called: |
| A. | Basic substances |
| B. | Acidic substances |
| C. | make the waste basic before disposal |
| D. | Substances |
| E. | None of these |
| Answer» D. Substances | |
| 54. |
Which of the following match is incorrect? Indicator Acid Base (i) Methyl Orange Red Yellow (ii) Phenolphthalein Pink Colourless (iii) Litmus Red Blue (iv) China rose Green Magenta |
| A. | (i) and (ii) |
| B. | (ii) and (iv) |
| C. | \[N{{a}_{2}}C{{O}_{3}}\] |
| D. | (iii) and (iv) |
| E. | None of these |
| Answer» C. \[N{{a}_{2}}C{{O}_{3}}\] | |
| 55. |
Which of the following is formed by the reaction of an acid with a base? |
| A. | A salt |
| B. | An indicator |
| C. | Nitric acid |
| D. | All of the above |
| Answer» B. An indicator | |
| 56. |
Who devised pH scale? |
| A. | Sorenson |
| B. | Bohr |
| C. | Sugar |
| D. | Arrhenius |
| Answer» D. Arrhenius | |
| 57. |
Compound 'X' in the aqueous form reacts with ammonium carbonate to give an acidic gas. What is compound 'X'? |
| A. | Calcium hydroxide |
| B. | Ethanoic acid |
| C. | Stain was of ice-cream and the cloth washing bar was acidic. |
| D. | Sulphuric acid |
| Answer» E. | |
| 58. |
Which of the following compounds dissolves in water to give a solution with a pH greater than 7? |
| A. | Calcium carbonate |
| B. | Copper (II) hydroxide |
| C. | turn blue litmus red |
| D. | Sulphur dioxide |
| Answer» D. Sulphur dioxide | |
| 59. |
Identify the acid used for producing explosives. |
| A. | \[HN{{O}_{3}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | XYPQRAt cathodeAt anode\[C{{l}_{2}}\] gas\[{{H}_{2}}\] gas\[NaHC{{O}_{3}}\] |
| D. | \[{{H}_{3}}P{{O}_{4}}\] |
| Answer» B. \[{{H}_{2}}S{{O}_{4}}\] | |
| 60. |
A solid element 'X' is a non-metal. It can form |
| A. | an acidic oxide. |
| B. | a basic oxide. |
| C. | PQRS Sodium hydroxideSodium hydrogen carbonate Calcium hydroxide Milk of magnesia |
| D. | a metallic salt. |
| Answer» B. a basic oxide. | |
| 61. |
Which of the following is a dibasic acid? |
| A. | \[HCl\] |
| B. | \[{{H}_{3}}P{{O}_{4}}\] |
| C. | Abase |
| D. | \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» E. | |
| 62. |
Statement I: Metal ions are Lewis acids. Statement II: Metal ions are electron pair acceptors. [NDA] |
| A. | Both the statements individually true and Statement II is the correct explanation of Statement I. |
| B. | Both the statements are individually true but Statement II is not correct explanation of Statement I. |
| C. | Statement I is true but Statement II is false. |
| D. | Statement I is false but Statement II is true. |
| Answer» B. Both the statements are individually true but Statement II is not correct explanation of Statement I. | |
| 63. |
Which among the following statements with regard to pH scale is/are correct? [NDA] I. It is a logarithmic scale. II. The scale is limited to 0-14 because the ionic product of water is about \[{{10}^{-14}}\] III. The lower the value of pH, the greater is the acidity of the solution. Select the correct answer using the code given below |
| A. | I and II only |
| B. | I, II and III |
| C. | I and III only |
| D. | II only |
| Answer» C. I and III only | |
| 64. |
Which one among the following is not a property of salt? [NDA] |
| A. | Salts have ordered packing arrangements called lattices |
| B. | Salts have low melting points but high boiling points |
| C. | Salts are brittle |
| D. | Salts conduct electricity when dissolved in water or even in the molten state |
| Answer» C. Salts are brittle | |
| 65. |
Food cans are coated with tin and not with zinc because [CDS] |
| A. | zinc is costlier than tin. |
| B. | zinc has a higher melting point than tin. |
| C. | zinc is more reactive than tin. |
| D. | zinc is less reactive than tin. |
| Answer» D. zinc is less reactive than tin. | |
| 66. |
What is anode mud? |
| A. | Fan of anode |
| B. | Metal of anode |
| C. | Impurities collected at anode in electrolysis during purification of metals |
| D. | All of these |
| Answer» D. All of these | |
| 67. |
Column-I(Product) Column-II (Name of alloy) A. Aircrafts P. Stainless steel B. Utensils Q. Bronze C. Medals R. Magnalium D. Balance beam S. Duralumin |
| A. | A-S;B-P;C-Q;D-R |
| B. | A-P;B-S;C-Q;D-R |
| C. | A-S;B-P;C-R;D-Q |
| D. | A-P;B-S;C-R;D-Q |
| Answer» B. A-P;B-S;C-Q;D-R | |
| 68. |
Which method is employed for obtaining a pure metal? |
| A. | Froth floatation |
| B. | Electrolytic refining |
| C. | Magnetic separation |
| D. | Gravity separation |
| Answer» C. Magnetic separation | |
| 69. |
Aluminium is used in thermite welding because - |
| A. | aluminium is a light metal |
| B. | aluminium has more affinity for oxygen |
| C. | aluminium is a strong oxidising agent |
| D. | aluminium is a reactive metal |
| Answer» C. aluminium is a strong oxidising agent | |
| 70. |
Removal of impurities from ore is known as - |
| A. | crushing and grinding |
| B. | concentration of ore |
| C. | calcination |
| D. | roasting |
| Answer» C. calcination | |
| 71. |
The acid in gastric juice is [NDA] |
| A. | acetic acid |
| B. | nitric acid |
| C. | hydrochloric acid |
| D. | sulphuric acid |
| Answer» D. sulphuric acid | |
| 72. |
Which of the following is not correct about Baking Soda? [CDS] |
| A. | It is used in soda acid fire extinguisher |
| B. | It is added for faster cooking. |
| C. | It is a corrosive base |
| D. | It neutralizes excess acid in the stomach |
| Answer» D. It neutralizes excess acid in the stomach | |
| 73. |
Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is [CDS] |
| A. | sodium hydrogen phthalate |
| B. | magnesium hydroxide |
| C. | calcium hydroxide |
| D. | manganese acetate |
| Answer» C. calcium hydroxide | |
| 74. |
Which one among the following is an electrochemical cell that cannot be charged? [NDA] |
| A. | Electrolytic cell |
| B. | Storage cell |
| C. | Primary cell |
| D. | Fuel cell |
| Answer» D. Fuel cell | |
| 75. |
Which one among the following is the correct order of strength of acids? [NDA] |
| A. | \[{{H}_{2}}S{{O}_{4}}>{{H}_{3}}P{{O}_{3}}>C{{H}_{3}}COOH\] |
| B. | \[{{H}_{3}}P{{O}_{3}}>{{H}_{2}}S{{O}_{4}}>C{{H}_{3}}COOH\] |
| C. | \[C{{H}_{3}}COOH>{{H}_{3}}P{{O}_{3}}>{{H}_{2}}S{{O}_{4}}\] |
| D. | \[C{{H}_{3}}COOH>{{H}_{2}}S{{O}_{4}}>{{H}_{3}}P{{O}_{3}}\] |
| Answer» B. \[{{H}_{3}}P{{O}_{3}}>{{H}_{2}}S{{O}_{4}}>C{{H}_{3}}COOH\] | |
| 76. |
The following equation is an example of a redox reaction, in which \[C{{l}_{2}}\] is the oxidizing agent and \[FeB{{r}_{3}}\] is the reducing agent: \[2FeB{{r}_{3}}\,\,(aq)\,\,+\,\,3C{{l}_{2}}\,\,(g)=2FeCl\,{{\,}_{3}}(aq)\,\,+\,\,3B{{r}_{2}}\,\,(1)\] Which one among the following statements is incorrect for this redox reaction? [NDA] |
| A. | Oxidizing agents are themselves reduced |
| B. | Reducing agents gain or appear to gain electrons |
| C. | Reducing agents are themselves oxidized |
| D. | Oxidizing agents oxidize other substances |
| Answer» C. Reducing agents are themselves oxidized | |
| 77. |
Bleaching powder gives smell of chlorine because it- |
| A. | is unstable |
| B. | gives chlorine on exposure to atmosphere |
| C. | is a mixture of chlorine and slaked lime |
| D. | contains excess of chlorine |
| Answer» C. is a mixture of chlorine and slaked lime | |
| 78. |
Washing soda has the formula - |
| A. | \[N{{a}_{2}}C{{O}_{3}}.7{{H}_{2}}O\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] |
| D. | \[N{{a}_{2}}C{{O}_{3}}\] |
| Answer» C. \[N{{a}_{2}}C{{O}_{3}}.{{H}_{2}}O\] | |
| 79. |
Chemical formula of baking soda is - |
| A. | \[MgS{{O}_{4}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[NaHC{{O}_{3}}\] |
| D. | \[MgC{{O}_{3}}\] |
| Answer» D. \[MgC{{O}_{3}}\] | |
| 80. |
Plaster of parts is made from - |
| A. | limestone |
| B. | slaked lime |
| C. | quicklime |
| D. | gypsum |
| Answer» E. | |
| 81. |
pH of human body varies within the range of |
| A. | 6.0 to 6.5 |
| B. | 5.5 to 5.8 |
| C. | 7.0 to 7.8 |
| D. | 7.0 to 11.0 |
| Answer» D. 7.0 to 11.0 | |
| 82. |
On which of the following acid rain has adverse effects? |
| A. | Marble structures |
| B. | Historical monuments |
| C. | Aquatic life |
| D. | All of these |
| Answer» E. | |
| 83. |
When vinegar reacts with baking soda the gas evolved is |
| A. | hydrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | nitrogen dioxide |
| Answer» D. nitrogen dioxide | |
| 84. |
Which of the following is known as dead burnt plaster? |
| A. | Quicklime |
| B. | Slaked lime |
| C. | Limestone |
| D. | Gypsum |
| Answer» C. Limestone | |
| 85. |
Aqueous solution of which of the following salt will change the colour of red litmus to blue? |
| A. | \[N{{a}_{2}}C{{O}_{3}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O\] |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» D. None of these | |
| 86. |
If pH of A, B, C and D are 9.5, 2.5, 3.5 and 5.5 respectively, then strongest acid is |
| A. | A |
| B. | C |
| C. | D |
| D. | B |
| Answer» E. | |
| 87. |
Which of the following compounds is basic in nature? |
| A. | \[Ca{{(OH)}_{2}}\] |
| B. | \[CaC{{l}_{2}}.6{{H}_{2}}O\] |
| C. | \[NaCl\] |
| D. | \[CuS{{o}_{4}}.5{{H}_{2}}O\] |
| Answer» B. \[CaC{{l}_{2}}.6{{H}_{2}}O\] | |
| 88. |
Which of the following is a weak base? |
| A. | NaOH |
| B. | KOH |
| C. | \[N{{H}_{4}}OH\] |
| D. | none of these |
| Answer» D. none of these | |
| 89. |
Acids and bases are important because of |
| A. | their use in industry |
| B. | their effects on human health |
| C. | their effect on farmer's crop |
| D. | all the above are correct. |
| Answer» E. | |
| 90. |
Which of the following is considered a mineral acid? |
| A. | Oxalic acid |
| B. | Lactic acid |
| C. | Citric acid |
| D. | Phosphoric acid |
| Answer» E. | |
| 91. |
Plaster of parts is obtained - |
| A. | by adding water to calcium sulphate |
| B. | by adding sulphuric acid to calcium hydroxide |
| C. | by heating gypsum to a very high temperature |
| D. | by heating gypsum to 373 K. |
| Answer» E. | |
| 92. |
Plaster of parts has the formula - |
| A. | \[CaS{{O}_{4}}.1/2{{H}_{2}}O\] |
| B. | \[CaS{{O}_{4}}.{{H}_{2}}O\] |
| C. | \[CaS{{O}_{4}}.1{\scriptstyle{}^{1}/{}_{2}}{{H}_{2}}O\] |
| D. | \[CaS{{O}_{4}}.2{{H}_{2}}O\] |
| Answer» B. \[CaS{{O}_{4}}.{{H}_{2}}O\] | |
| 93. |
Which of the following acid is present in sour milk? |
| A. | glycolic acid |
| B. | lactic acid |
| C. | citrus acid |
| D. | tartaric acid |
| Answer» C. citrus acid | |
| 94. |
Which of the following is acidic in nature - |
| A. | apple juice |
| B. | soap solution |
| C. | slaked lime |
| D. | lime |
| Answer» B. soap solution | |
| 95. |
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains |
| A. | NaCl |
| B. | HCl |
| C. | LiCI |
| D. | KCl |
| Answer» C. LiCI | |