Very Short Q & A :
Q1: The substances used to test whether a substance is acidic or basic are known as ________
Ans : Indicators
Q2: Name the most commonly used indicator.
Ans : Litmus paper
Litmus Paper
Q3: Form where does we extract litmus to be used as indicator.
Ans : Lichens
Q4: In acidic solution, litmus paper turns into ------
Ans : Red
Q5: In basic solution, litmus paper turns into ------
Ans : Blue
Q6: In distilled water , litmus paper turns into _________
Ans : purple
Q7: The reaction between an acid and a base is known as neutralisation.
Ans : The reaction between an acid and a base is known as neutralisation.
Q8: China rose indicator turns acidic solutions ------
Ans : Dark pink
Q9: China rose indicator turns basic solutions to ------
Ans : Green
Q10: Salt and water are produced in neutralisation process with the evolution of ____________
Ans : Heat
Q11: Name the acid present in our stomach.
Ans : HCL
Q12: What role does HCL present in our stomach plays?
Ans : It helps in digestion of food
Q13: Name the acid present in sting of an ant.
Ans : Formic acid
Q14: State the nature of soap solution.
Ans : Basic
Q15: State the nature of baking soda.
Ans : Basic
Q16: State the nature of lemon juice.
Ans : Acidic
Q17: Why lemon juice and orange juice tastes sour?
Ans : Because they contain acids.
Q18: Why baking soda taste sour?
Ans : Because it is basic in nature.
Q19: State one property of acids.
Ans : Acids are sour in taste.
Q20: State one property of bases.
Ans : Bases are bitter in taste.
Q21: Tina rubs a solution between fingers and feels soapy, what is the nature of that solution?
Ans : Basic
Q22: Complete the following reaction:
H C l + N a O H ----> ------- + H2O
Ans : NaCl
Q23: Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. its nature _______________
Ans : Basic
Q24: The wastes of many factories contain____________
Ans : Acids
Q25: Blue litmus paper is dipped in a solution. It remains blue, what is the nature of the solution?
Ans : Basic
Q26: Name the acid that is present in fats in our body.
Ans : Fatty acid
Q27: Each cell in our body contains an acid, name that acid.
Ans : the deoxyribonucleic acid
Q28: Hydrogen ion is common to all acids. True/False
Ans : True
Q29: Name a base that is also used in soda acid fire extinguishers.
Ans : Baking soda.
Q30: Which gas is liberated when an acid reacts with metals?
Ans : Hydrogen gas
Q31: The hydrogen ions combine with H2O to form ____________
Ans : hydronium ions (H3O+)
Q32: Aqueous solution of acid conduct electricity due to ______________ present in it.
Ans : ion
Q33: What is the common name of the compound CaOCl2?
Ans : Bleaching powder
Q34: Name a universal indicator.
Ans : pH Scale
Q35: Define pH.
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.
Ans : True
Q37: What is brine?
Ans : Aqueous solution of sodium chloride (NaCl) is known as brine.
Q38: Phenolphthalein becomes colourless in __________ and pink in_________.
Ans : Colourless in acid and pink in base.
Q39: What is the colour of methyl orange in acidic solution?
Ans : Pink
Q40: Name the acid present in vinegar.
Ans : Acetic acid
Q41: Name the acid present in lemon.
Ans : citric acid
Q42: Nitric acid turns red litmus blue. True/ False.
Ans : False
Q43: Tooth decay is caused by the presence of bases. True/ False.
Ans : False
Q44: Change of colour in an acid or base depends on
Ans : Type of indicator
Q45: Name the acid present in curd.
Ans : Lactic acid
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