alleryStart learning →Blue litmus paper dipped in lemon juice turns:
- red
- yellow
- blue
- green
Show answer and solution
Correct answer: A. red
Lemon juice contains citric acid.
Acids turn blue litmus red.
Uttarakhand Board Class 10 Acids Bases Salts — practice questions
Explore 31 free Acids Bases Salts questions in Uttarakhand Board Class 10 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
Practise Acids Bases Salts with Quill →Acids Bases Salts questions and exercises with answers
Showing questions 1–30 of 31.
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 →When dilute hydrochloric acid is poured on zinc granules, which gas is evolved?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 →Which ion concentration *increases* when an acid dissolves in water?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 →Which of the following salts does not contain water of crystallisation?Read the answer and worked solution →Sodium carbonate is a basic salt because it is a salt ofRead the answer and worked solution →Calcium phosphate is present in tooth enamel. Its nature isRead the answer and worked solution →Which of the following gives the correct increasing order of acidic strength?Read the answer and worked solution →One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent isRead the answer and worked solution →To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used isRead the answer and worked solution →The pH of the gastric juices released during digestion isRead the answer and worked solution →Which one of the following can be used as an acid-base indicator by a visually impaired student?Read the answer and worked solution →Which of the following substance will not give carbon dioxide on treatment with dilute acid?Read the answer and worked solution →Which of the following is used for dissolution of gold?Read the answer and worked solution →Which of the following is not a mineral acid?Read the answer and worked solution →Which among the following is not a base?Read the answer and worked solution →Which of the following are present in a dilute aqueous solution of hydrochloric acid?Read the answer and worked solution →Sort each pH by what it meansRead the answer and worked solution →Tap every solution that is acidicRead the answer and worked solution →Which solution has the higher pH?Read the answer and worked solution →Match each indicator to its resultRead the answer and worked solution →
Worked practice questions
Phenolphthalein in a sodium hydroxide solution is:
- colourless
- red
- pink
- yellow
Show answer and solution
Correct answer: C. pink
NaOH is a strong base.
Phenolphthalein is colourless in acid and pink in base — so it turns pink.
Onion juice loses its smell in a:
- neutral solution
- basic solution
- acidic solution
- sugar solution
Show answer and solution
Correct answer: B. basic solution
Onion is an olfactory indicator.
Its sharp smell weakens in a basic solution (loss of smell signals base).
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