Advertisements
Advertisements
Question
What happens when carbon dioxide gas is passed through lime water for a considerable time ?
Write equations of the reactions involved.
Solution
Lime water solution becomes clear.
`CaCO_3 (S) + CO_2 (g)+H_2O(I) → Ca(HCO_3)_2(aq)`
APPEARS IN
RELATED QUESTIONS
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
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?
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
Identify the correct representation of reaction occurring during chloralkali process
