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MCQOPTIONS
This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.
| 2101. |
What happens when an acid is slowly added to water? |
| A. | It releases heat. |
| B. | It absorbs heat. |
| C. | There is no heat change. |
| D. | It undegoes neutralization. |
| Answer» B. It absorbs heat. | |
| 2102. |
Acid produced by some ants: |
| A. | Oxalic acid |
| B. | Tartaric acid |
| C. | Formic acid |
| D. | Ascorbic acid |
| E. | None of these |
| Answer» D. Ascorbic acid | |
| 2103. |
Acid reacts with metal to form: |
| A. | \[\text{salt+C}{{\text{O}}_{\text{2}}}\] |
| B. | salt + water |
| C. | \[\text{salt+}{{\text{O}}_{\text{2}}}\] |
| D. | \[\text{salt+}{{\text{H}}_{\text{2}}}\] |
| Answer» E. | |
| 2104. |
Which of the following is the weakest acid? |
| A. | Citric |
| B. | Sulphuric |
| C. | Hydrochloric |
| D. | Nitric |
| Answer» B. Sulphuric | |
| 2105. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The substance which shows the nature of a solution as acidic or basic with the change in colour are called indicators. Reason (R): Red litmus turns blue in a solution containing vitamin 'C'. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» D. A is false but R is true. | |
| 2106. |
Strong base among the following is: |
| A. | Calcium hydroxide |
| B. | Sodium hydroxide |
| C. | Sodium hydrogencarbonate |
| D. | Ammonium hydroxide |
| E. | None of these |
| Answer» C. Sodium hydrogencarbonate | |
| 2107. |
Common name of copper sulphate is: |
| A. | chalk |
| B. | quicklime |
| C. | nitre |
| D. | blue vitriol |
| Answer» E. | |
| 2108. |
Raghu used excessive chemical fertilizers in his field while Raman found the soil of his field to be basic in nature. What should they add to their fields to improve the quality of the soil? |
| A. | Raghu: Organic matter Raman: Quick lime |
| B. | Raghu: Quick lime Raman: Organic matter |
| C. | Both should add quick lime. |
| D. | Both should add organic matter. |
| Answer» C. Both should add quick lime. | |
| 2109. |
How does colourless phenolphthalein change in the presence of bases? |
| A. | Remains colourless |
| B. | Becomes pink |
| C. | Becomes red |
| D. | Becomes green |
| Answer» C. Becomes red | |
| 2110. |
Which of the following is not an indicator? |
| A. | China rose |
| B. | Onion |
| C. | Clove |
| D. | Lemon |
| Answer» E. | |
| 2111. |
A natural dye extracted from lichens and most commonly used as an indicator. What is its colour in distilled water? |
| A. | Blue (b) |
| B. | Red |
| C. | Mauve |
| D. | Colourless |
| Answer» D. Colourless | |
| 2112. |
Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of a paper and applied this paste on them. After drying she put few drops of given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed? (i) Amia Juice (ii) Lime water (iii) Common salt solution (iv) Baking soda solution |
| A. | (i) (ii) (iii) (iv) Yellow Red Yellow Red |
| B. | (i) (ii) (iii) (iv) Red Yellow Yellow Red |
| C. | (i) (ii) (iii) (iv) Red Red Yellow Yellow |
| D. | (i) (ii) (iii) (iv) Yellow Yellow Red Red |
| Answer» B. (i) (ii) (iii) (iv) Red Yellow Yellow Red | |
| 2113. |
The compounds which produce hydroxyl ions\[\text{(O}{{\text{H}}^{\text{-}}}\text{)}\] in water are called |
| A. | alkalies |
| B. | bases |
| C. | acids |
| D. | None of these |
| Answer» C. acids | |
| 2114. |
Which one of the following salts is used for making detergent powder? |
| A. | Washing soda |
| B. | Potassium nitrate |
| C. | Sodium bicarbonate |
| D. | Common salt |
| Answer» B. Potassium nitrate | |
| 2115. |
If you perform an experiment bare handed and you realise that your palm has become slippery and slimy. The most probable reason for this is that you have dropped: |
| A. | sodium hydroxide on your hands. |
| B. | hydrochloric acid on your hands. |
| C. | sodium chloride on your hands. |
| D. | None of these |
| Answer» B. hydrochloric acid on your hands. | |
| 2116. |
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. | (ii) and (iii) |
| D. | (iii) and (iv) |
| E. | None of these |
| Answer» C. (ii) and (iii) | |
| 2117. |
Usefulness of an indicator depends upon change in: |
| A. | its colour |
| B. | its physical state |
| C. | its temperature |
| D. | its pressure |
| Answer» B. its physical state | |
| 2118. |
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In an experiment about 10 ml of sodium hydroxide solution was taken in a beaker 'A'. To it was added a few drops of red litmus solution which turned blue. This solution was then taken in beaker 'B' and vinegar was added to it drop by drop with continuous stirring. It was observed that the colour of solution in beaker 'B' has changed to red. This experiment shows: |
| A. | Saponification |
| B. | Acidification |
| C. | Neutralization |
| D. | Both (b) and (c) |
| Answer» E. | |
| 2119. |
A science teacher has arranged the following; sets of test tubes as She asked the students to find out the incorrect statement about the above experimental set-up. |
| A. | Turmeric solution turns red in test tubes 1 and 3. |
| B. | China rose indicator turns green in test tubes 2 and 4. |
| C. | Methyl orange turns yellow in test tubes 1 and 3. |
| D. | Phenolphthalein remains colorless in test tubes 2 and 4. |
| Answer» C. Methyl orange turns yellow in test tubes 1 and 3. | |
| 2120. |
Complete the given reaction: \[2Al{{(OH)}_{3}}+3{{H}_{2}}S{{O}_{4}}\to \] |
| A. | \[A{{l}_{2}}S{{O}_{4}}+{{H}_{2}}+{{O}_{2}}\] |
| B. | \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+6{{H}_{2}}O\] |
| C. | \[A{{l}_{2}}(S{{O}_{4}})+3{{O}_{2}}+6{{H}_{2}}\] |
| D. | \[A{{l}_{2}}S{{O}_{2}}+{{H}_{2}}O+S{{O}_{2}}\] |
| E. | None of these |
| Answer» C. \[A{{l}_{2}}(S{{O}_{4}})+3{{O}_{2}}+6{{H}_{2}}\] | |
| 2121. |
Which of the following is a neutralization reaction? |
| A. | Sodium chloride + Water\[\to \] Sodium hydroxide + Hydrochloric acid |
| B. | Calcium carbonate + Water\[\to \] Calcium hydroxide + Carbon dioxide |
| C. | Sodium hydroxide + Hydrochloric add \[\to \]Sodium chloride + Water |
| D. | Copper sulphate + Zinc\[\to \] Zinc sulphate + Copper |
| Answer» D. Copper sulphate + Zinc\[\to \] Zinc sulphate + Copper | |
| 2122. |
An indicator which is obtained from the association of fungus and algae: |
| A. | China rose |
| B. | Turmeric |
| C. | Phenolphthalein |
| D. | Litmus |
| E. | None of these |
| Answer» E. None of these | |
| 2123. |
A neutralization reaction shows a reaction between; |
| A. | Acid and acid |
| B. | Base and base |
| C. | Acid and base |
| D. | Acid and water |
| E. | None of these |
| Answer» D. Acid and water | |
| 2124. |
Identify the base used in making antacids. |
| A. | Calcium hydroxide |
| B. | Sodium hydroxide |
| C. | Magnesium hydroxide |
| D. | Barium hydroxide |
| Answer» D. Barium hydroxide | |
| 2125. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 The rain which contains a higher level of acid than normal is called acid rain. Acidic gases like sulphur dioxide, nitrogen dioxide and carbon dioxide which are released as pollutants during the burning of various types of faels dissolve in rain drops and when these rain drops fall as rain on earth, we call it acid rain. What is the main cause of acid rain? |
| A. | Pollution |
| B. | Deforestation |
| C. | Excessive rains |
| D. | All factors are equally effective |
| Answer» B. Deforestation | |
| 2126. |
Which among the following is organic weak acid? |
| A. | Formic acid |
| B. | Sulphuric acid |
| C. | Nitric acid |
| D. | Hydrochloric acid |
| Answer» B. Sulphuric acid | |
| 2127. |
Select the one that should be used for treating a person stung by an ant. |
| A. | Sodium carbonate solution |
| B. | Water |
| C. | Vinegar |
| D. | None of these |
| Answer» B. Water | |
| 2128. |
Silver and gold are purified with: |
| A. | nitric acid |
| B. | \[\text{HCl}\] |
| C. | acetic acid |
| D. | sulphuric acid |
| Answer» B. \[\text{HCl}\] | |
| 2129. |
DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Salts are the products of an acid- base reaction. Reason (R): Salt may be acidic or basic. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» C. A is true but R is false. | |
| 2130. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 The rain which contains a higher level of acid than normal is called acid rain. Acidic gases like sulphur dioxide, nitrogen dioxide and carbon dioxide which are released as pollutants during the burning of various types of faels dissolve in rain drops and when these rain drops fall as rain on earth, we call it acid rain. Nonmetallic oxides react with water to form: |
| A. | acids |
| B. | bases |
| C. | salt |
| D. | None of these |
| Answer» B. bases | |
| 2131. |
A base used in baking bread is: |
| A. | \[NaHC{{O}_{3}}\] |
| B. | \[CaC{{O}_{3}}\] |
| C. | \[N{{H}_{4}}OH\] |
| D. | All the above |
| E. | None of these |
| Answer» B. \[CaC{{O}_{3}}\] | |
| 2132. |
Which of the following contains oxalic acid? |
| A. | Lemon |
| B. | Vinegar |
| C. | Spinach |
| D. | All the above |
| E. | None of these |
| Answer» D. All the above | |
| 2133. |
What is the chemical formula of caustic soda? |
| A. | \[Mg{{(OH)}_{2}}\] |
| B. | \[KOH\] |
| C. | \[Ca{{(OH)}_{2}}\] |
| D. | \[NaOH\] |
| Answer» E. | |
| 2134. |
Sunidhis teacher asked her to prepare dilute sulphuric acid from concentrated sulphuric acid. What should she do? |
| A. | Add water to the acid |
| B. | Add acid to the water |
| C. | Add a base to the concentrated acid |
| D. | Add an alkali to the concentrated acid |
| Answer» C. Add a base to the concentrated acid | |
| 2135. |
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 3 Rahul and Manish went to a party Rahul ate too much fast food in the party and after returning home was complaining about the stomachache. Manish was worried about his condition. They went to doctor. Doctor told them not to get worried as this is due to indigestion of food and gave him some medicines. The medicines that are used to relieve us of indigestion are generally called |
| A. | antibiotic |
| B. | analgesic |
| C. | antacid |
| D. | antipyretic |
| Answer» D. antipyretic | |
| 2136. |
DIRECTIONS: Read the following three statements and choose the correct answer. (i) If the soil is basic then compost is added to it to neutralize the basic nature of soil. (ii) China rose indicator changes colour to dark pink in acidic media and green in basic media. (iii) Tomato contains acetic acid. |
| A. | Statement (i) and (iii) are incorrect but (ii) is correct |
| B. | Statement (i) and (ii) are incorrect but (iii) is correct |
| C. | All statements are correct |
| D. | All statements are incorrect |
| Answer» D. All statements are incorrect | |
| 2137. |
Which of the following statements is correct? (i) A base is a substance that reacts with acids and neutralize them. (ii) All bases are alkalies. (iii) A base that is soluble in water is called salt. (iv) All alkalies are bases. |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (iii) and (iv) |
| E. | None of these |
| Answer» D. (iii) and (iv) | |
| 2138. |
Match the following: Column A Column B (i) Oxalic acid [A] Curd (ii) Acetic acid [B] Tamarind (iii) Tartaric acid [C] Spinach (iv) Lactic acid [D] Vinegar |
| A. | (i - C), (ii - D), (iii - A), (iv - B) |
| B. | (i - D), (ii - A), (iii - B), (iv - C) |
| C. | (i - C), (ii - D), (iii - B), (iv - A) |
| D. | (i - D), (ii - C) (iii - B), (iv - A) |
| E. | None of these |
| Answer» D. (i - D), (ii - C) (iii - B), (iv - A) | |
| 2139. |
Ammonium hydroxide and magnesium hydroxide tastes ___ because they are ___ in nature. |
| A. | Sour, acidic |
| B. | Bitter, basic |
| C. | Salty salty |
| D. | Bitter, acidic |
| E. | None of these |
| Answer» C. Salty salty | |
| 2140. |
Which of the following indicators gives Magenta or dark pink colour in acidic solutions? |
| A. | Turmeric |
| B. | Phenolphthalein |
| C. | China rose |
| D. | Litmus paper |
| E. | None of these |
| Answer» D. Litmus paper | |
| 2141. |
Match column I with column II and select the correct option from the codes given below. Column I Column II (P) Ammonium hydroxide (i) Spinach (Q) Tartaric acid (ii) Window cleaner (R) Zinc carbonate (iii) Tamarind (S) Oxalic acid (iv) Calamine |
| A. | (P) - (ii), (Q) - (iii), (R) - (iv), (S) - (i) |
| B. | (P) - (iv), (Q) - (i), (R) - (ii), (S) - (iii) |
| C. | (P) - (ii), (Q) - (iii), (R) - (i), (S) - (iv) |
| D. | (P) - (iii), (Q) - (ii), (R) - (iv), (S) - (i) |
| Answer» B. (P) - (iv), (Q) - (i), (R) - (ii), (S) - (iii) | |
| 2142. |
Which of the following statements is correct7 |
| A. | Acids turn blue litmus red. |
| B. | Bases turn red litmus blue. |
| C. | Water changes the colour of a litmus. |
| D. | Both (A) and (B) |
| Answer» E. | |
| 2143. |
What is the chemical formula of caustic potash? |
| A. | \[KOH\] |
| B. | \[N{{H}_{4}}OH\] |
| C. | \[Al{{(OH)}_{3}}\] |
| D. | \[LiOH\] |
| Answer» B. \[N{{H}_{4}}OH\] | |
| 2144. |
DIRECTIONS: The questions in this segment consists of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sulphuric acid is also known as oil of vitriol. Reason (R): It has oily appearance. |
| A. | Both A and R are true and R is the correct explanation of A. |
| B. | Both A and R are true but R is not the correct explanation of A. |
| C. | A is true but R is false. |
| D. | A is false but R is true. |
| Answer» B. Both A and R are true but R is not the correct explanation of A. | |
| 2145. |
DIRECTIONS: Match Column-I with Column-II and select the correct answer using the codes given below the columns. Column - I Column - II (A) Oxalic acid (p) As an eye-wash, antiseptic and grain preservation (B) Nitric acid (q) For making explosives (C) Boric acid (r) In food preservation (D) Benzoic acid (s) As a constituent of ink stain remover |
| A. | (A) \[\to \] (s), (B) \[\to \] (q), (C) \[\to \] (r), (D) \[\to \] (p) |
| B. | (A) \[\to \] (q), (B) \[\to \] (s), (C) \[\to \] (p), (D) \[\to \] (r) |
| C. | (A) \[\to \] (r), (B) \[\to \] (q), (C) \[\to \] (p), (D) \[\to \] (s) |
| D. | (A) \[\to \] (s), (B) \[\to \] (q), (C) \[\to \] (p), (D) \[\to \] (r) |
| Answer» E. | |
| 2146. |
Which of the following diagram(s) represent(s) alkalis and bases in the correct form? |
| A. | (i) only |
| B. | (iii) only |
| C. | (i) and (iv) only |
| D. | (ii) and (iii) only |
| Answer» B. (iii) only | |
| 2147. |
Which of the following statements is correct about salts? |
| A. | Most salts are solids. |
| B. | Most of the salts have high melting and boiling points. |
| C. | Salt solutions in water are good conductors of electricity. |
| D. | All the above |
| E. | None of these |
| Answer» E. None of these | |
| 2148. |
_____salt is used in developing films in photography. |
| A. | \[NaCl\] |
| B. | \[NaHC{{O}_{3}}\] |
| C. | \[AgN{{O}_{3}}\] |
| D. | \[CuS{{O}_{4}}\] |
| E. | None of these |
| Answer» D. \[CuS{{O}_{4}}\] | |
| 2149. |
DIRECTIONS: Read the following two statements carefully and choose the correct options. (i) Orange juice turns blue litmus red (ii) Sting of an ant contains acetic acid |
| A. | Statement (i) is correct while statement (ii) is incorrect |
| B. | Statement (ii) is correct while statement (i) is incorrect. |
| C. | Both statements are correct |
| D. | Both statements are incorrect. |
| Answer» B. Statement (ii) is correct while statement (i) is incorrect. | |
| 2150. |
DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In three test- tubes 'A', 'B', 'C' with solutions of different substances were added a few drops of China rose indicator. The colours shows in these test-tubes were magenta, colourless and green respectively Select the correct set indicating the substance whose solution are there in these test-tubes. |
| A. | ?A? ?B? ?C? Sugar solution Lime water Lime juice |
| B. | ?A? ?B? ?C? Sugar solution Lime juice Lime water |
| C. | ?A? ?B? ?C? Lime water Sugar Solution Lime juice |
| D. | ?A? ?B? ?C? Lime juice Sugar solution Lime water |
| Answer» E. | |