alleryAcids turn blue litmus paper:
- colourless
- red
- blue
- green
Show answer and solution
Correct answer: B. red
Acids turn blue litmus red.
Tamil Nadu SSLC (Class 10) Calorimetry — practice questions
Explore 35 free Calorimetry questions in Tamil Nadu SSLC (Class 10) Science. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 35.
Acids turn blue litmus paper:Read the answer and worked solution →Bases turn red litmus paper:Read the answer and worked solution →Litmus, extracted from lichens, is an example of a:Read the answer and worked solution →Which of the following is a synthetic indicator used to test acids and bases?Read the answer and worked solution →The reaction between an acid and a base, producing salt and water, is called:Read the answer and worked solution →On the pH scale, a neutral solution (such as pure water) has a pH of:Read the answer and worked solution →A solution with a pH less than 7 is:Read the answer and worked solution →A solution with a pH greater than 7 is:Read the answer and worked solution →Acids produce which ion when dissolved in water?Read the answer and worked solution →Bases produce which ion when dissolved in water?Read the answer and worked solution →Baking soda, often used to relieve acidity, is chemically:Read the answer and worked solution →A curry stain turns reddish-brown on a soap-washed cloth and yellow again on rinsing because soap is:Read the answer and worked solution →Blue litmus paper dipped in lemon juice turns:Read the answer and worked solution →Phenolphthalein in a sodium hydroxide solution is:Read the answer and worked solution →Onion juice loses its smell in a:Read the answer and worked solution →The gas evolved when an acid reacts with a carbonate turns lime water:Read the answer and worked solution →Neutralisation of an acid by a base produces:Read the answer and worked solution →CuO + 2 HCl → CuCl₂ + H₂O shows that a metallic oxide behaves like a:Read the answer and worked solution →A solution turns red litmus blue and has pH = 11. The solution is:Read the answer and worked solution →Hydrochloric acid and acetic acid of the same concentration are compared. Which is the stronger acid?Read the answer and worked solution →Plaster of Paris is chemically:Read the answer and worked solution →Baking soda (NaHCO₃) is used in antacid tablets mainly because it:Read the answer and worked solution →Farmers add slaked lime, Ca(OH)₂, to soil that is too:Read the answer and worked solution →pH less than 7 indicates a solution that is:Read the answer and worked solution →Litmus paper turns blue when dipped in a/an:Read the answer and worked solution →Acid + active metal gives:Read the answer and worked solution →NaOH + HCl → NaCl + H₂O is a:Read the answer and worked solution →Match each indicator to its colour in acidic solution.Read the answer and worked solution →CLASS10 · Chemistry · Acid or BaseRead the answer and worked solution →Which of the following salts does not contain water of crystallisation?Read the answer and worked solution →
Worked practice questions
Bases turn red litmus paper:
- colourless
- yellow
- red
- blue
Show answer and solution
Correct answer: D. blue
Bases turn red litmus blue.
Litmus, extracted from lichens, is an example of a:
- neutral salt
- strong acid
- natural indicator
- synthetic indicator
Show answer and solution
Correct answer: C. natural indicator
Litmus is a natural indicator (from lichens); turmeric is another.
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