Advertisements
Advertisements
Question
Lime water turns milky when ______ gas is passed through it.
Options
H2
CO
CO2
SO2
Advertisements
Solution
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
RELATED QUESTIONS
While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.
Why do acids not show acidic behaviour in the absence of water?
What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
(a) methyl orange
What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?
red cabbage extract
What colours do the following indicators turn when added to an acid (such as hydrochloric acid)?
methyl orange
How will you test for the presence of this gas?
Explain with an example. Give the chemical equation of the 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:
(a) 4 mL
(b) 8 mL
(c) 12 mL
(d) 16 mL
What is common in all the water soluble bases (or alkalis)?
What is meant by strong bases and weak bases? 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 equations of the reactions involved.
Write the main difference between an acid and a base.
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?
Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What might be the reason for his observation?
- Soap is acidic in nature
- Soap is basic in nature
- Turmeric is a natural indicator which gives reddish tinge in bases
- Turmeric is a natural indicator which gives reddish tinge in acids
Which of the following phenomena occur when a small amount of acid is added to water?
- Ionisation
- Neutralisation
- Dilution
- Salt formation
Which of the following is(are) true when HCl (g) is passed through water?
- It does not ionise in the solution as it is a covalent compound.
- It ionises in the solution
- It gives both hydrogen and hydroxyl ions in the solution
- It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule
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.
