CBSE Science Class 7
Acids, Bases and Salts
Acids, Bases and Salts - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: The substances used to test whether a substance is acidic or basic are known as ________
View Answer
Q2: Name the most commonly used indicator.
View Answer
Q3: Form where does we extract litmus to be used as indicator.
View Answer
Q4: In acidic solution, litmus paper turns into ------
View Answer
Q5: In basic solution, litmus paper turns into ------
View Answer
Q6: In distilled water , litmus paper turns into _________
View Answer
Q7: The reaction between an acid and a base is known as neutralisation.
View Answer
Ans:
The reaction between an acid and a base is known as neutralisation.
Q8: China rose indicator turns acidic solutions ------
- Dark pink
- Purple
- Blue
- None of these
View Answer
Q9: China rose indicator turns basic solutions to ------
- Dark pink
- Purple
- Blue
- Green
View Answer
Q10: Salt and water are produced in neutralisation process with the evolution of ____________
View Answer
Q11: Name the acid present in our stomach.
View Answer
Q12: What role does HCL present in our stomach plays?
View Answer
Ans:
It helps in digestion of food
Q13: Name the acid present in sting of an ant.
View Answer
Q14: State the nature of soap solution.
View Answer
Q15: State the nature of baking soda.
View Answer
Q16: State the nature of lemon juice.
View Answer
Q17: Why lemon juice and orange juice tastes sour?
View Answer
Ans:
Because they contain acids.
Q18: Why baking soda taste sour?
View Answer
Ans:
Because it is basic in nature.
Q19: State one property of acids.
View Answer
Ans:
Acids are sour in taste.
Q20: State one property of bases.
View Answer
Ans:
Bases are bitter in taste.
Q21: Tina rubs a solution between fingers and feels soapy, what is the nature of that solution?
View Answer
Q22: Complete the following reaction:
H C l + N a O H ----> ------- + H2O
View Answer
Q23: Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. its nature _______________
View Answer
Q24: The wastes of many factories contain____________
View Answer
Q25: Blue litmus paper is dipped in a solution. It remains blue, what is the nature of the solution?
View Answer
Q26: Name the acid that is present in fats in our body.
View Answer
Q27: Each cell in our body contains an acid, name that acid.
View Answer
Ans:
the deoxyribonucleic acid
Q28: Hydrogen ion is common to all acids. True/False
View Answer
Q29: Name a base that is also used in soda acid fire extinguishers.
View Answer
Q30: Which gas is liberated when an acid reacts with metals?
View Answer
Q31: The hydrogen ions combine with H2O to form ____________
View Answer
Ans:
hydronium ions (H3O+)
Q32: Aqueous solution of acid conduct electricity due to ______________ present in it.
View Answer
Q33: What is the common name of the compound CaOCl2?
View Answer
Q34: Name a universal indicator.
View Answer
Q35: Define pH.
View Answer
Ans:
pH is the measure of Acidity or Alkalinity of a solution. The term pH stands for negative log of hydrogen ion concentration.
Q36: The bases that dissolve in water are known as alkalies. True/ False.
View Answer
Q37: What is brine?
View Answer
Ans:
Aqueous solution of sodium chloride (NaCl) is known as brine.
Q38: Phenolphthalein becomes colourless in __________ and pink in_________.
View Answer
Ans:
Colourless in acid and pink in base.
Q39: What is the colour of methyl orange in acidic solution?
View Answer
Q40: Name the acid present in vinegar.
View Answer
Q41: Name the acid present in lemon.
View Answer
Q42: Nitric acid turns red litmus blue. True/ False.
View Answer
Q43: Tooth decay is caused by the presence of bases. True/ False.
View Answer
Q44: Change of colour in an acid or base depends on
- Type of indicator
- Acidic property of that substance
- Basis property of that substance
- None of these
View Answer
Q45: Name the acid present in curd.
View Answer
