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Science True False[1 Marks ]

Acids, Bases and Salts · UP Board (UPMSP) STD 7 (UPMSP - English Medium). 15 questions.

Questions

True False[1 Marks ]

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15 questions · timed · auto-graded

Question 11 Mark
Tooth decay is caused by the presence of a base. $(T/F)$
  • True
  • False
Answer
Tooth decay is caused by the presence of a base. (F)
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Question 21 Mark
Indicator is a substance which shows different colours in acidic and basic solutions. $(T/F)$
  • True
  • False
Answer
Indicator is a substance which shows different colours in acidic and basic solutions. (T)
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Question 31 Mark
Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. $(T/F)$
  • Ture
  • False
Answer
Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T)
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Question 41 Mark
Sodium hydroxide turns blue litmus red. $(T/F)$
  • True
  • False
Answer
Sodium hydroxide turns blue litmus red. (F)
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Question 101 Mark
A compound if acidic will turn all indicators red. True/ False
Answer
False.
Explanation:
Acids do not turn all indicators red.
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Question 111 Mark
Common salt dissolved in water turns blue litmus red. True/ False
Answer
False. Explanation: It does not change the colour of litmus at all.
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Question 131 Mark
Fill in the Blank. Acetic acid is present in ________ while _________ is present in lemon.
Answer
Acetic acid is present in vinegar while citric acid is present in lemon.
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Question 151 Mark
Phenolphthalein is a natural indicator. True/ False
Answer
False. Explanation: It is a man-made indicator.
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