CBSE Questions for Class 7 Chemistry Acids Bases And Salts Quiz 3 - MCQExams.com

Which one of the following are the correct observations about acetic acid?
  • It turns blue litmus red and smells like vinegar
  • It turns blue litmus red and smells like burning sulphur
  • It turns red litmus blue and smells like vinegar
  • It turns red litmus blue and has a fruity smell
What do we observe on pouring acetic acid on red and blue litmus paper?
  • Red litmus remains red and blue litmus turns red.
  • Red litmus turns blue and blue litmus remains blue.
  • Red litmus turns blue and blue litmus turns red.
  • Red litmus becomes colourless and blue litmus remains blue.
An example of a solution which is not in equilibrium is:
  • chemical pH indicator
  • acid/base buffer
  • anhydrous solution
  • hypotonic solution
  • supersaturated solution
The acidic behaviour of lakes and oceans can be neutralized by:
  • $$NaOH$$
  • $$HCl$$
  • $$CaCO_3$$
  • $$Ca(OH)_2$$
Phenolpthalein is ____________ type of indicator.
  • Natural indicator
  • Universal indicator
  • Synthetic indicator
  • None of the above
When honeybee bites, which chemical enters in to our body?
  • Calcium formate
  • Melittin
  • Formic acid
  • Magnesium hydroxide
In which of the following, neutralisation reaction takes place?
  • Breakdown of glucose
  • Treatment of acidity
  • Photosynthesis
  • All of the above
From which plant is litmus paper or litmus solution obtained?
  • Moss
  • Rose
  • Hibiscus
  • Lichen
Remedies of which of the following are examples of neutralisation in everyday life?
  • Ant sting
  • Indigestion
  • Factory wastes
  • None of these
Which of the following is not a property of acid?
  • Acids are sour in taste
  • Acid turns blue litmus to red.
  • Acids change the colour of turmeric
  • None of these
Which of the following acid is present naturally in the spinach? 
  • Oxalic acid
  • Succinic acid
  • Tartaric acid
  • Citrus acid
Which of the following substance enters our body when a red ant bites us?
  • Melittin
  • Calcium Formate
  • Formic acid
  • Magnesium hydroxide
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colour would be observed ?
  • Yellow in both acid and base
  • Yellow in acid and red in base
  • Pink in acid and yellow in base
  • Red in acid and blue in base
Product of neutralization reactions are always :
  • an acid and a base.
  • an acid and a salt.
  • a salt and a base.
  • a salt and water.
Which of the following is acid-base indicator?
  • Ginger
  • Turmeric
  • Clove
  • None of these
China rose indicator turns acidic solution to:
  • magenta
  • light blue
  • green
  • yellow
Which of the following acid(s) is/are present in vinegar and lemon?
  • acetic acid
  • citric acid
  • both A and B
  • none of these
China rose is which type of indicator?
  • Olfactory indicator
  • Synthetic indicator
  • Natural indicator
  • None of the above
Why bee strings are treated by alkaline solutions?
  • Because it is basic in nature.
  • Because it is acidic in nature.
  • Because it is treatable by only alkaline solution.
  • None of these.
A solution changes the colour of turmeric paper from yellow to red. The solution is:
  • basic
  • acidic
  • neutral
  • either neutral or acidic
Honey bee stings and ant bites can be _________ using alkaline medicine such as baking powder.
  • Acidifies
  • Neutralize
  • Prevented
  • None of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Read the given statements and select the correct option:
Statement 1: To neutralise the effect of a bee sting, that portion of the body is rubbed with moist baking soda.
Statement 2: Baking soda contains sodium carbonate which neutralises the effect of acid injected by bee sting.
  • Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1
  • Both statements 1 and 2 are true and statement 2 is not the correct explanation of statement 1
  • Statement 1 is true and statement 2 is false
  • Both statements 1 and 2 are false
The given figure shows the colour changes in test tubes I, II and III, when China rose indicator is added to them. The respective solutions in test tubes I, II and III are
810717_37bca81e2b224087b2834fe4e63367ed.PNG
  • Sugar solution, Lime water, Baking powder
  • Sugar solution, Lemon juice, Vinegar
  • Lime water, Sugar solution, Lemon juice
  • Lemon juice, Sugar solution, Lime water
Read the given statements and select the correct option. 
Statement 1 : Calamine solution is applied on the skin when an ant bites.
Statement 2 : Ant injects ammonia into the skin which can be neutralised by rubbing with calamine solution.
  • Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
  • Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
  • Statement 1 is true and statement 2 is false.
  • Both statements 1 and 2 are false.
China rose turns acidic solution to ________ and basic solution to ________.
  • red, blue
  • light red, green
  • green, light red
  • dark pink, green
In the titration of ferrous ammonium sulphate and potassium dichromate, the external indicator used is:
  • $$KCNS$$
  • $$NH_{4}CNS$$
  • $$K_{3}[Fe(CN)_{6}]$$
  • $$K_{4}[Fe(CN)_{6}]$$
What happens to the colour of litmus paper when you put a drop of acid on it?
  • It gets destroyed
  • From red it turns blue
  • From blue it turns red
  • It is unaffected by acid
Using toothpaste in daily life is the example of _________.
  • acidic reaction
  • basic reaction
  • neutralization reaction
  • none of these
Phenolphthalein is a synthetic indicator and its color in acidic and basic solutions, respectively are: 
  • red and blue
  • blue and red
  • pink and colorless
  • colorless and pink
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