Advertisements
Advertisements
प्रश्न
Lime water turns milky when ______ gas is passed through it.
विकल्प
H2
CO
CO2
SO2
Advertisements
उत्तर
Lime water turns milky when CO2 gas is passed through it.
Explanation:
This is because carbon dioxide reacts with calcium hydroxide in lime water to form insoluble calcium carbonate, which appears as a milky white precipitate.
APPEARS IN
संबंधित प्रश्न
Why does distilled water not conduct electricity whereas rain water does?
What colour does the following indicator turn when added to an acid (such as hydrochloric acid)?
Methyl orange
Acids produce ______ ions on dissolving in water.
What happens when dilute hydrochloric acid is added to sodium carbonate? Write a balanced chemical equation of the reaction involved.
Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate? How will you test for the presence of this gas?
Give the chemical equation of the neutralisation reaction which takes place.
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:
What is common in all the water soluble bases (or alkalis)?
Classify the following into strong bases and weak bases:
NH4OH, Ca(OH)2, NaOH, KOH, Mg(OH)2
What happens when carbon dioxide gas is passed through lime water for a considerable time?
Write the equation of the reaction involved.
Write the main difference between an acid and a base.
When a small amount of acid is added to water, the phenomena which occur are:
- Dilution
- Neutralisation
- Formation of H3O+ ions
- Salt formation
In the experimental set-up to show that "the germinating seeds give out carbon dioxide", answer the following questions:
(i) Why do we keep the conical flask airtight?
(ii) Name the substance kept in the small test tube inside the conical flask. Write its role.
(iii) Why does water rise in the delivery tube?
Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.
A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, It gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.
- A compound 'A' with a molecular formula of \[\ce{C2H4O2}\] reacts with a base to give salt and water. Identify 'A', state its nature and the name of the functional group it possesses. Write chemical equation for the reaction involved.
- When the above stated compound 'A' reacts with another compound 'B' having molecular formula \[\ce{C2H6O}\] in the presence of an acid, a sweet smelling compound is 'C' formed.
- Identify 'B' and 'C'.
- State the role of acid in this reaction.
- Write chemical equation for the reaction involved.
