7th Class Science Acids, Bases and Salts / अम्ल, क्षार एवं लवण Question Bank

done Acids, Bases and Salts Total Questions - 40

• question_answer1)
  Identify the acid present in tamarind.
  A)
   Tannic acid         done clear
  B)
   Lactic acid           done clear
  C)
          Tartaric acid    done clear
  D)
          Citric acid                            done clear
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• question_answer2)
  Which acid is present in vinegar?
  A)
   Formic acid    done clear
  B)
          Acetic acid          done clear
  C)
          Citric acid      done clear
  D)
          Malic acid                           done clear
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• question_answer3)
  In which of the following is ascorbic acid present?
  A)
   Tea and coffee done clear
  B)
   Milk done clear
  C)
   Ants done clear
  D)
   Fruits and vegetables done clear
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• question_answer4)
  From which of the following is the natural indicator litmus extracted?
  A)
   Mycorrhiza        done clear
  B)
   Lichens                done clear
  C)
          Mucor                  done clear
  D)
          Mycelia                               done clear
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• question_answer5)
  What is injected into the skin when an ant bites?
  A)
   Acid                                      done clear
  B)
   Base                     done clear
  C)
   Salt                        done clear
  D)
          Water done clear
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• question_answer6)
  Which of the following chemicals are used to neutralize the basic nature of soil?
  A)
   Quicklime done clear
  B)
   Organic matter done clear
  C)
   Slaked lime done clear
  D)
   Baking soda done clear
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• question_answer7)
  Which of the following is an antacid?
  A)
   \[Mg{{(OH)}_{2}}\]                        done clear
  B)
  \[NaOH\]             done clear
  C)
         \[{{H}_{2}}S{{O}_{4}}\]  done clear
  D)
         \[{{H}_{2}}O\] done clear
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• question_answer8)
  Identify the two kinds of litmus paper.
  A)
   Blue and red     done clear
  B)
   Blue and yellow done clear
  C)
          Red and green done clear
  D)
          Yellow and red done clear
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• question_answer9)
  Which of the following statements is correct7
  A)
   Acids turn blue litmus red. done clear
  B)
   Bases turn red litmus blue. done clear
  C)
   Water changes the colour of a litmus. done clear
  D)
   Both (A) and (B) done clear
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• question_answer10)
  How does methyl orange indicator change its colour in the presence of acids?
  A)
   Yellow                                  done clear
  B)
   Green  done clear
  C)
          Red                       done clear
  D)
          White                   done clear
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• question_answer11)
  How does methyl orange indicator change its colour in the presence of bases?
  A)
   Green                                  done clear
  B)
   Black     done clear
  C)
          Red                       done clear
  D)
          Yellow done clear
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• question_answer12)
  What change does colourless phenolphthalein undergo in acidic and neutral solutions?
  A)
   Remains colourless done clear
  B)
   Turns pink done clear
  C)
   Turns red done clear
  D)
   Turns green done clear
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• question_answer13)
  How does colourless phenolphthalein change in the presence of bases?
  A)
   Remains colourless done clear
  B)
   Becomes pink done clear
  C)
   Becomes red done clear
  D)
   Becomes green done clear
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• question_answer14)
  A substance X is found in the milk of magnesia. What is X?
  A)
   An acid                                done clear
  B)
   A base done clear
  C)
          Water                  done clear
  D)
          A salt done clear
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• question_answer15)
  What happens when an acid is slowly added to water?
  A)
   It releases heat. done clear
  B)
   It absorbs heat. done clear
  C)
   There is no heat change. done clear
  D)
   It undegoes neutralization. done clear
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• question_answer16)
  A substance Y contains oxalic acid. What is Y?
  A)
   Vinegar                               done clear
  B)
   Tamarind            done clear
  C)
          Soap                     done clear
  D)
          Spinach                               done clear
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• question_answer17)
  Identify the formula of washing soda from the following,                       
  A)
   \[NaCl\]                                              done clear
  B)
   \[N{{a}_{2}}C{{O}_{3}}\]              done clear
  C)
          \[NaHC{{O}_{3}}\]          done clear
  D)
          \[NaOH\]                            done clear
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• question_answer18)
  Which acid is used in the making of synthetic vinegar?
  A)
   Formic acid        done clear
  B)
   Acetic acid          done clear
  C)
          Sulphuric acid done clear
  D)
          Nitric acid done clear
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• question_answer19)
  What is the effect of the soap solution on phenolphthalein?
  A)
   It turns pink. done clear
  B)
   It remains colourless. done clear
  C)
   It turns blue. done clear
  D)
   It turns red. done clear
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• question_answer20)
  An indicator prepared from turmeric (Haldi) is added to a strong alkali solution. What colour does the indicator change to?
  A)
   Yellow                                  done clear
  B)
   Brick red             done clear
  C)
          Orange                done clear
  D)
          Blue                      done clear
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• question_answer21)
  What is the chemical formula of caustic potash?
  A)
   \[KOH\]                                               done clear
  B)
  \[N{{H}_{4}}OH\]             done clear
  C)
         \[Al{{(OH)}_{3}}\]            done clear
  D)
          \[LiOH\] done clear
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• question_answer22)
  A base reacts with an acid to form salt and water. What is this reaction called?
  A)
   Oxidation reaction done clear
  B)
   Neutralization reaction done clear
  C)
   Reduction reaction done clear
  D)
   Biochemical reaction done clear
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• question_answer23)
  Identify the base used in making antacids.
  A)
   Calcium hydroxide done clear
  B)
   Sodium hydroxide done clear
  C)
   Magnesium hydroxide done clear
  D)
   Barium hydroxide done clear
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• question_answer24)
  Study the given reaction. \[NaOH+HCl\to NaCl+{{H}_{2}}O\] Identify the salt in the above reaction.
  A)
   \[NaCl\]                                              done clear
  B)
  \[{{H}_{2}}O\]   done clear
  C)
          \[HCl\]                 done clear
  D)
          \[NaOH\]                            done clear
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• question_answer25)
  Identify the salt used in cooking.
  A)
  \[NaCl\]                               done clear
  B)
  \[MgC{{l}_{2}}\]               done clear
  C)
          \[CaC{{l}_{2}}\]                done clear
  D)
         \[KCl\] done clear
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• question_answer26)
  When\[C{{O}_{2}}\]is passed through lime water, it turns milky. Identify the cause for the milkiness.
  A)
   Formation of \[CaC{{O}_{3}}\] done clear
  B)
   Formation of \[Ca{{(OH)}_{2}}\] done clear
  C)
   Formation of \[{{H}_{2}}O\] done clear
  D)
   Formation of\[{{H}_{2}}\] done clear
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• question_answer27)
  Chemically, which of the following is baking soda?
  A)
  \[Ca{{(OH)}_{2}}\]                           done clear
  B)
  \[NaHC{{O}_{3}}\]           done clear
  C)
         \[N{{a}_{2}}C{{O}_{3}}\]               done clear
  D)
          \[CaO\] done clear
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• question_answer28)
  Which is the weakest acid among the following?
  A)
   Citric acid done clear
  B)
   Sulphuric acid                      done clear
  C)
   Hydrochloric acid done clear
  D)
                      Nitric acid                             done clear
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• question_answer29)
  What is the chemical formula of caustic soda?
  A)
   \[Mg{{(OH)}_{2}}\]        done clear
  B)
  \[KOH\]                done clear
  C)
          \[Ca{{(OH)}_{2}}\]          done clear
  D)
         \[NaOH\]                             done clear
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• question_answer30)
  What are the solutions which do not change the colour of either red or blue litmus called?
  A)
   Acidic                                   done clear
  B)
   Basic     done clear
  C)
          Neutral                done clear
  D)
          Alcohol done clear
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• question_answer31)
  Which of the following does milk contain?
  A)
   Acid                                      done clear
  B)
   Base                     done clear
  C)
   Salt                        done clear
  D)
          All of the above done clear
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• question_answer32)
  Sunidhis teacher asked her to prepare dilute sulphuric acid from concentrated sulphuric acid. What should she do?   
  A)
   Add water to the acid             done clear
  B)
   Add acid to the water done clear
  C)
   Add a base to the concentrated acid done clear
  D)
   Add an alkali to the concentrated acid done clear
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• question_answer33)
  What do toothpastes contain?
  A)
   Strong acids       done clear
  B)
   Bases   done clear
  C)
          Acidic oxides    done clear
  D)
          Metals done clear
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• question_answer34)
  Which of the following statements is NOT true?
  A)
   Antacids are bases. done clear
  B)
   A salt is neither acidic nor basic. done clear
  C)
   Phenolphthalein is an indicator. done clear
  D)
   All bases are alkalis but all alkalis are not bases. done clear
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• question_answer35)
  A pH scale is given below. Which of the following mixtures can produce a neutral solution?
  A)
   P and Q                               done clear
  B)
   P and R                done clear
  C)
          R and S                done clear
  D)
          All of these done clear
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• question_answer36)
  Juice prepared from lemon is taken in a glass tumbler and water is added to it. Then a red litmus paper and a blue litmus paper were dipped into it. What changes were observed?
  A)
   Red litmus paper turns blue. done clear
  B)
   Blue litmus paper turns red. done clear
  C)
   Red litmus paper becomes white. done clear
  D)
   Blue litmus paper becomes white. done clear
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• question_answer37)
  In an accident at a factory, some nitric acid was spilled. Which substance, when added in excess would neutralize the acid without leaving an alkaline solution?
  A)
   Aqueous ammonia done clear
  B)
   Aqueous sodium hydroxide done clear
  C)
   Calcium carbonate done clear
  D)
   Water done clear
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• question_answer38)
  What do antacids contain?
  A)
   A weak acid       done clear
  B)
   A weak base     done clear
  C)
          A strong acid  done clear
  D)
          A strong base done clear
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• question_answer39)
  Which of the following substances react with each other to form salt and water only?
  A)
   Dilute sodium hydroxide and dilute hydrochloric acid done clear
  B)
   Magnesium and dilute hydrochloric acid done clear
  C)
   Copper sulphate and dilute sulphuric acid done clear
  D)
   Washing soda solution in water and dilute nitric acid done clear
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• question_answer40)
  Identify the only base which does not have a metal in its molecule.
  A)
   \[NaOH\] (Sodium hydroxide) done clear
  B)
  \[N{{H}_{4}}OH\](Ammonium hydroxide) done clear
  C)
  \[Mg{{(OH)}_{2}}\] (Magnesium hydroxide) done clear
  D)
  \[Ca{{(OH)}_{2}}\]  (Calcium hydroxide) done clear
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