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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
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
Fill in the blank in the following sentences:
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?
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 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.
Choose the correct option from given alternative:
When a small amount of acid is added to water, the phenomena which occur are:
(A) Dilution
(B) Neutralization
(C) Formation of H3O+ ions
(D) Salt formation
Answer the following question.
Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
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?
In which of the following setups would the bulb glow?
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
Identify the correct representation of reaction occurring during chloralkali process
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.
