From Which Plant is Litmus Paper Or Litmus Solution Obtained? - Science and Technology 1


From which plant is litmus paper or litmus solution obtained?

  1. Moss
  2. Rose
  3. Hibiscus
  4. Lichen


(d) Lichen.

Litmus is a water soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria.

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2013-2014 (March)


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Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
(d) Na2CO3

  Column A   Column B
i eosin 1 losing hydrogen
ii oxidation 2 synthetic indicator
    3 losing oxygen
    4 natural indicator


When phenolphthalein is added to NaOH, the colour of the solution will become _________.

  1. colourless
  2. red
  3. pink
  4. yellow

While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be:

The litmus paper or the litmus solution is obtained from ________ plant

(A) Moss

(B) Lichen

(C) Rose

(D) Hibiscus

Name one natural source of  the following acids:
 Lactic acid

What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

What ions are present in the solutions of following substances? (write the symbols only)
Hydrochloric acid

State two uses each of the following compounds:

 Sodium hydroxide

What are esters? How are esters prepared? Write the chemical equation for the reaction involved. What happens when an ester reacts with sodium hydroxide? Write the chemical equation for the reaction and also state the name and use of this reaction.

Phenolphthalein is a synthetic type of indicator.

Choose the correct alternative and rewrite the following sentence.

Phenolphthalein is ___________ type of indicator. 

When _______________ is passed through fresh lime water, it turns milky.

Answer the following question:
What is the universal indicator? Does Mg (OH)2 react with sodium hydroxide? If not, why?

Magnesium hydroxides are used for treating _______

Acids turn blue litmus paper to ______.

What is a neutralization reaction? Give an example.

If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

Common salt besides being used in kitchen can also be used as the raw material for making

  1. washing soda
  2.  bleaching powder
  3.  baking soda
  4.  slaked lime

Vinegar is ______ in taste.

A salt may be ______.

Solutions of acids conduct ______.

______ change the colour of the indicators.

Which acid is present in milk?

Can we taste acids and bases to identify them?

Are all acids corrosive in nature? Name a few acids which are non-corrosive and may be part of our food.

Copper or brass cooking vessels are coated with tin metal. Why?

Take a clean test tube with a holder and pour some dilute hydrochloric acid. Add a few pieces of magnesium ribbon pieces slowly. What do you observe? Now show a burning match stick near the mouth of the test tube. Do you hear any sound? The gas burns with a pop sound. From this, it is observed that hydrogen gas has been formed due to the reaction between acid and metal.

What is the correct procedure for mixing acid and water? Why?

“All acids contain one or more hydrogen atoms, but not all substances containing hydrogen are acids.” Support this statement with examples.

______ & ______ metals do not react with HCl or HNO3.

The formula of bleaching powder is  ______.

The taste of acid is ______.

Write notes on the properties of acids.

Consider the following salt:


What would be the pH of the solution if, in YCl, Y is sodium? Give a reason for your answer.

The metal that will not produce hydrogen gas when reacted with dilute acids.


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