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प्रश्न
Lime water turns milky when ______ gas is passed through it.
पर्याय
H2
CO
CO2
SO2
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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.
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संबंधित प्रश्न
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)?
red cabbage extract
What colours do the following indicators turn when added to an acid (such as hydrochloric acid)?
methyl orange
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Acids produce.......................... ions on dissolving in water.
Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate?
What happens when carbon dioxide gas is passed through lime water for a short time?
Write equations of the reactions involved.
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 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.
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?
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
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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.
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- 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.
