Choose the correct option
(i) In lemon juice
(a) H+
ions are more, OH–
ions are less
(b) H+
ions are less, OH–
ions are more
(c) H+
ions and OH–
ions are equal
(d) Only H+
ions are present
(ii) When an acid reacts with a metal carbonate then we get-
(a) Salt and water
(b) Salt and water and carbon dioxide
(c) Salt and sulphur dioxide
(d) Salt and hydrochloric acid are
(iii) Which among the following is not a strong acid
(a) HCl (b) HNO3
(c) CH3COOH (d) H2SO4
(iv) The pH of a neutral solution is
(a) 1 (b) 0
(c) 14 (d) 7
(v) Sakina has a burning sensation in her stomach due to acidity; she needs
(a) A strong acid (b) A strong base
(c) A weak base (d) A weak acid
(vi) The cause of tooth decay is pH of saliva
(a) Being less than 6.5 (b) Becoming 7
(c) Being less than 5.5 (d) Being more than 6.5
(vii) Which of the following salts is acidic in nature
(a) NaCl (b) Na2SO4
(c) NH4Cl (d) KNO3
(i) In lemon juice
(a) H+
ions are more, OH–
ions are less
(b) H+
ions are less, OH–
ions are more
(c) H+
ions and OH–
ions are equal
(d) Only H+
ions are present
(ii) When an acid reacts with a metal carbonate then we get-
(a) Salt and water
(b) Salt and water and carbon dioxide
(c) Salt and sulphur dioxide
(d) Salt and hydrochloric acid are
(iii) Which among the following is not a strong acid
(a) HCl (b) HNO3
(c) CH3COOH (d) H2SO4
(iv) The pH of a neutral solution is
(a) 1 (b) 0
(c) 14 (d) 7
(v) Sakina has a burning sensation in her stomach due to acidity; she needs
(a) A strong acid (b) A strong base
(c) A weak base (d) A weak acid
(vi) The cause of tooth decay is pH of saliva
(a) Being less than 6.5 (b) Becoming 7
(c) Being less than 5.5 (d) Being more than 6.5
(vii) Which of the following salts is acidic in nature
(a) NaCl (b) Na2SO4
(c) NH4Cl (d) KNO3
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Answers & Comments
(i) in lemon juice, H⁺ ions are more, OH⁻ ions are less.
option (a) is correct.
(ii) when an acid reacts with a metal carbonate, then we get salt + water + CO₂
eg:- Na₂CO₃ + 2HCl → 2NaCl + CO₂ + H₂O
option (b) is correct.
(iii) CH₃COOH is not a strong acid. it is a weak acid.
option (c) is correct.
(iv) pH of a neutral acid is 7.
option (d) is correct.
(v) she needs a strong base. eg:- Mg(OH)₂.
option (b) is correct.
(vi) pH of saliva being less than 5.5.
option (c) is correct.
(vii) NH₄Cl is acidic in nature.
option (c) is correct.
hope it helps..
Verified answer
1) should be A as lemon juice is majorly acid and may have traces of water, its more H+ and lesser OH-.2) should be B . Example : HCl + Na2CO3 --> NaCl + CO2 + H2O
3) should be C. Organic acids are generally very weak relative to mineral acids.
4) should be D. pH of neutral solution on normal scale is 7 which is balanced H+ and OH- ion concentration.
5) should be B. Strong bases like Mg(OH)2 - milk of magnesia helps for relief.
6) should be C. Mostly factual info.
7) should be C. It is a combination of a weak base and strong acid .