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प्रश्न
The litmus paper or the litmus solution is obtained from ________ plant
(A) Moss
(B) Lichen
(C) Rose
(D) Hibiscus
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उत्तर
Lichen
APPEARS IN
संबंधित प्रश्न
What do we observe on pouring acetic acid on red and blue litmus papers?
(A) Red litmus remains red and blue litmus turns red.
(B) Red litmus turns blue and blue litmus remains blue.
(C) Red litmus turns blue and blue litmus turns red.
(D) Red litmus becomes colourless and blue litmus remains blue.
Complete and balance the following chemical equations:
NaOH (aq) HCI (aq)→
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)
Sulphuric acid
What ions are present in the solutions of following substances? (write the symbols only)
Magnesium hydroxide
Define an acid and a base. Give two examples of each.
Hydrochloric acid reacts with a metal X to form a gas Y which burns with a 'pop' sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.
Write the chemical equation of the reaction of metal X with (i) hydrochloric acid, and (ii) sodium hydroxide solution.
What would be the colour of litmus in a solution of sodium carbonate?
With which substance should chlorine be treated to get bleaching powder?
Name the product formed when Cl2 and H2 produced during the electrolysis of brine are made to combine.
Complete and balance the following chemical equations:
`Ca(OH)_2 + Cl_2 ->`
Explain why, sodium hydrogencarbonate is used as an antacid.
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.
If you take some distilled water in a test-tube, add an equal amount of acetic acid to it, shake the test-tube well and leave it undisturbed on the test-tube stand, then after about 5 minutes what would you observe?
(A) There is a layer of water over the layer of acetic acid.
(B) A precipitate is setting at the bottom of the test-tube.
(C) Bubbles of colourless gas are coming out of the test-tube.
(D) There is a clear, colourless transparent solutions in the test-tube.
Phenolphthalein is a synthetic type of indicator.
Answer the following question.
Identify the acid and base which form sodium hydrogen carbonate. Write the chemical equation in support of your answer. State whether this compound is acidic, basic, or neutral. Also, write its pH value.
Magnesium hydroxides are used for treating _______
Which of the following salts does not contain any water of crystallisation?
If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?
Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas?
