Question

24 Give reasons :
(0) Why do ionic compounds have high melting points?
(ii) Why calcium starts floating when calcium reacts with water?​

Answer 1

Answer:

Ionic compounds are held together by electrostatic forces between the oppositely charged ions . As the ionic lattice contains such a large number of ions, a lot of energy is needed to overcome this ionic bonding so ionic compounds have high melting and boiling points.

Explanation:

आयनिक यौगिकों को इलेक्ट्रोस्टैटिक बलों द्वारा विरोधी आवेशित आयनों के बीच एक साथ रखा जाता है। ... चूंकि आयनिक जाली में इतनी बड़ी संख्या में आयन होते हैं, इस आयनिक बंधन को दूर करने के लिए बहुत अधिक ऊर्जा की आवश्यकता होती है इसलिए आयनिक यौगिकों में उच्च पिघलने और क्वथनांक होते हैं।

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Answer 2

Answer:

i) Ionic compounds are held together by electrostatic forces between the oppositely charged ions. As the ionic lattice contains such a large number of ions, a lot of energy is needed to overcome this ionic bonding so ionic compounds have high melting and boiling points.

ii) This is an exothermic reaction, i.e. heat is released. As the reaction proceeds, bubbles of H2 (g) and a white precipitate of Ca(OH)2are formed. The bubbles formed stick to the surface of calcium metal and make it lighter. Therefore, Calcium floats on water.

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