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

done Acids, Bases and Salts Total Questions - 40

• question_answer1)
  A base used in baking bread is:
  A)
  \[NaHC{{O}_{3}}\]       done clear
  B)
         \[CaC{{O}_{3}}\] done clear
  C)
  \[N{{H}_{4}}OH\]                    done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer2)
  A synthetic indicator used to test an acid or base is:
  A)
  China rose                     done clear
  B)
  Methyl orange done clear
  C)
  Turmeric                        done clear
  D)
  Litmus done clear
  E)
  None of these done clear
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• question_answer3)
  An element X reacts with oxygen to form Y which turns red litmus to blue then, which of the following is correct?
  A)
  X is a metal and Y is acidic oxide. done clear
  B)
  X is a non-metal and Y is basic oxide. done clear
  C)
  X is a metal and Y is basic oxide. done clear
  D)
  X is a non-metal and Y is acidic oxide. done clear
  E)
  None of these done clear
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• question_answer4)
  Choose the incorrect statement about acid.

  (i) Acids have a sour taste.

  (ii) Acids turn blue litmus red.

  (iii) Acids have a soapy feel.

  (iv) Acids are non-corrosive in nature.

  A)
  (i) and (iv)                      done clear
  B)
  (ii) and (iii) done clear
  C)
  (i) and (ii)                       done clear
  D)
  (iii) and (iv) done clear
  E)
  None of these done clear
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• question_answer5)
  Which of the following indicators gives Magenta or dark pink colour in acidic solutions?
  A)
  Turmeric                        done clear
  B)
  Phenolphthalein done clear
  C)
  China rose         done clear
  D)
  Litmus paper done clear
  E)
  None of these done clear
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• question_answer6)
  Which of the following is a weak acid?
  A)
  \[HN{{O}_{3}}\]                       done clear
  B)
  \[HCl\] done clear
  C)
  \[C{{H}_{3}}COOH\] done clear
  D)
  \[{{H}_{2}}S{{O}_{4}}\] done clear
  E)
  None of these done clear
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• question_answer7)
  A neutralization reaction shows a reaction between;
  A)
  Acid and acid     done clear
  B)
  Base and base done clear
  C)
  Acid and base done clear
  D)
         Acid and water done clear
  E)
  None of these done clear
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• question_answer8)
  An indicator which is obtained from the association of fungus and algae:
  A)
  China rose                     done clear
  B)
  Turmeric done clear
  C)
  Phenolphthalein done clear
  D)
         Litmus done clear
  E)
  None of these done clear
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• question_answer9)
  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)                       done clear
  B)
  (ii) and (iv)  done clear
  C)
  (ii) and (iii)                     done clear
  D)
  (iii) and (iv) done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer10)
  Substances whose solutions do not change the colour of any indicator in any way are called:
  A)
  Basic substances done clear
  B)
  Acidic substances done clear
  C)
  Neutral substances          done clear
  D)
  Substances done clear
  E)
  None of these done clear
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• question_answer11)
  Which of the following is an organic acid?
  A)
  Acetic acid                     done clear
  B)
  Tartaric acid done clear
  C)
  Oxalic acid                    done clear
  D)
  All the above done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer12)
  Which one of the following can neutralize acids
  A)
  \[Mg{{(OH)}_{2}}\]                   done clear
  B)
  \[NaHC{{O}_{3}}\] done clear
  C)
  \[HCl\]               done clear
  D)
         Both [a] and [b] done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer13)
  A base contained in calamine solution which neutralises the acidic liquid of the ant is:
  A)
  \[Mg{{(OH)}_{2}}\]                   done clear
  B)
  \[ZnC{{O}_{3}}\]    done clear
  C)
  \[HN{{O}_{3}}\]                       done clear
  D)
  \[NaHC{{O}_{3}}\] done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer14)
  To make the soil fertile what a farmer should add to the soil?
  A)
  Slaked lime                    done clear
  B)
  Quick lime done clear
  C)
  Sulphuric acid done clear
  D)
         Manure done clear
  E)
  None of these done clear
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• question_answer15)
  Sodium hydroxide combines with hydrochloric acid to form:
  A)
  Sodium hydrogencarbonate done clear
  B)
  Sodium chloride done clear
  C)
  Sodium hydrogenchloride done clear
  D)
  Water only done clear
  E)
  None of these done clear
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• question_answer16)
  Strong acid among the following is:
  A)
  Magnesium hydroxide done clear
  B)
  Sodium hydrogencarbonate done clear
  C)
  Potassium hydroxide done clear
  D)
  Sodium hydroxide done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer17)
  Acid produced by some ants:
  A)
  Oxalic acid                    done clear
  B)
  Tartaric acid done clear
  C)
  Formic acid                    done clear
  D)
  Ascorbic acid done clear
  E)
  None of these done clear
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• question_answer18)
  Ammonium hydroxide and magnesium hydroxide tastes ___ because they are ___ in nature.
  A)
  Sour, acidic                    done clear
  B)
  Bitter, basic done clear
  C)
  Salty salty                     done clear
  D)
  Bitter, acidic done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer19)
  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) done clear
  B)
  (i - D), (ii - A), (iii - B), (iv - C) done clear
  C)
  (i - C), (ii - D), (iii - B), (iv - A) done clear
  D)
  (i - D), (ii - C) (iii - B), (iv - A) done clear
  E)
  None of these done clear
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• question_answer20)
  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)                       done clear
  B)
  (ii) and (iii)  done clear
  C)
  (i) and (iv)          done clear
  D)
  (iii) and (iv) done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer21)
  Strong base among the following is:
  A)
  Calcium hydroxide          done clear
  B)
  Sodium hydroxide done clear
  C)
  Sodium hydrogencarbonate done clear
  D)
  Ammonium hydroxide done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer22)
  Which of the following statements is correct?
  A)
  A basic compound will turn all indicators blue. done clear
  B)
  All substances are either acidic or basic. done clear
  C)
  Distilled water in which common salt is dissolved turns blue litmus red. done clear
  D)
  Calamine solution can be used to treat ant's sting. done clear
  E)
  None of these done clear
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• question_answer23)
  Special type of substances used to test whether a substance is acidic/basic are known as:
  A)
  Indicators           done clear
  B)
  Acids       done clear
  C)
  Bases                done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer24)
  Which two acids combine to form aqua regia and in what ratio?
  A)
  3 parts of sulphuric acid and 1 part of Nitric acid. done clear
  B)
  2 parts of Nitric acid and 2 parts of hydrochloric acid. done clear
  C)
  4 parts of Nitric and 2 parts of Hydrochloric acid. done clear
  D)
  3 parts of hydrochloric acid and 1 part of nitric acid. done clear
  E)
  None of these done clear
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• question_answer25)
  When Vedika washed a stain of vegetable curry on her suit with a cloth washing bar then it turned brownish-red, then it shows that the:
  A)
  Stain was of turmeric and the cloth washing bar was basic. done clear
  B)
  Stain was of turmeric and the cloth washing bar was acidic. done clear
  C)
  Stain was of ice-cream and the cloth washing bar was acidic. done clear
  D)
  Stain was of yellow paint and the cloth washing bar was acidic. done clear
  E)
  None of these done clear
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• question_answer26)
  Which of the following is a neutral substance?
  A)
  Distilled water     done clear
  B)
  Common salt done clear
  C)
  Sugar                done clear
  D)
  All the above done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer27)
  Which of the following is a mineral acid?
  A)
  Oxalic acid                    done clear
  B)
  Formic acid done clear
  C)
  Nitric acid          done clear
  D)
  Ascorbic acid done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer28)
  Which of the following acids is used to prepare explosives such as TNT?
  A)
  Sulphuric acid done clear
  B)
  Oxalic acid done clear
  C)
  Lactic acid done clear
  D)
  Ammonium hydroxide done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer29)
  ____ is a compound formed by replacing the hydrogen of an acid by a metal.
  A)
  Base                             done clear
  B)
  Acid done clear
  C)
  Salt                   done clear
  D)
  Non-metal done clear
  E)
  None of these done clear
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• question_answer30)
  Which of the following statements is correct about salts?
  A)
  Most salts are solids. done clear
  B)
  Most of the salts have high melting and boiling points. done clear
  C)
  Salt solutions in water are good conductors of electricity. done clear
  D)
  All the above done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer31)
  _____salt is used in developing films in photography.
  A)
  \[NaCl\]             done clear
  B)
  \[NaHC{{O}_{3}}\] done clear
  C)
  \[AgN{{O}_{3}}\]          done clear
  D)
  \[CuS{{O}_{4}}\] done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer32)
  Which of the following contains oxalic acid?
  A)
  Lemon              done clear
  B)
  Vinegar done clear
  C)
  Spinach done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer33)
  Which of the following are corrosive and can burn the skin?

  (i) Copper hydroxide

  (ii) Ammonium hydroxide

  (iii) Sodium hydroxide

  (iv) Potassium hydroxide

  A)
  (ii) and (ii)                      done clear
  B)
  (iii) and (iv) done clear
  C)
  (ii) and (iii)                     done clear
  D)
  (i) and (iv) done clear
  E)
  None of these done clear
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• question_answer34)
  Which of the following is a basic salt?
  A)
  \[NaHC{{O}_{3}}\]       done clear
  B)
  \[N{{H}_{4}}Cl\] done clear
  C)
  \[N{{a}_{2}}S{{O}_{4}}\]                    done clear
  D)
  All the above done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer35)
  Sodium Chloride will turn:
  A)
  Turmeric brownish-red done clear
  B)
  China rose green done clear
  C)
  Litmus blue to red done clear
  D)
  All the above done clear
  E)
  None of these done clear
  View Solution play_arrow

• question_answer36)
  Oil of vitriol is historic name of ___.
  A)
  Nitric acid                      done clear
  B)
  Sulphuric acid done clear
  C)
  Hydronium ions done clear
  D)
         Acetic acid done clear
  E)
  None of these done clear
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• question_answer37)
  Properties of an acid is due to the presence of:
  A)
  Ammonium ions done clear
  B)
  Oxide ions done clear
  C)
  Hydrogen ions done clear
  D)
         Hydride ions done clear
  E)
  None of these done clear
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• question_answer38)
  Salt formed by strong acid and weak base is:
  A)
  Basic                 done clear
  B)
  Acidic      done clear
  C)
  Neutral              done clear
  D)
  Volatile done clear
  E)
  None of these done clear
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• question_answer39)
  Borax turns litmus paper
  A)
  Blue                  done clear
  B)
  Red done clear
  C)
  Pink                              done clear
  D)
  Purple done clear
  E)
  None of these done clear
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• question_answer40)
  Complete the given reaction: \[2Al{{(OH)}_{3}}+3{{H}_{2}}S{{O}_{4}}\to \]
  A)
  \[A{{l}_{2}}S{{O}_{4}}+{{H}_{2}}+{{O}_{2}}\] done clear
  B)
  \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+6{{H}_{2}}O\] done clear
  C)
  \[A{{l}_{2}}(S{{O}_{4}})+3{{O}_{2}}+6{{H}_{2}}\] done clear
  D)
  \[A{{l}_{2}}S{{O}_{2}}+{{H}_{2}}O+S{{O}_{2}}\] done clear
  E)
  None of these done clear
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