11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A
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TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A
Published on: 13/05/2022
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Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test1.
Why does lithium exhibit anomalous properties?
2.
Why are potassium and caesium, rather than lithium used in photochemical cells?
3.
Why is the density of potassium less than that of sodium?
4.
How does the alkali metals produce characteristic colour to the oxidising flame
5.
Lithium salts are more soluble than the salts of other metals of group 1. Justify.
1.
Reasons for anomalous behaviour of lithium,
(i) Extremely small in size
(ii) Greater polarizing power of ion
(iii) Least electropositive character
(iv) Non-availability of d-orbitals
2.
(i) Due to low ionisation energy K and Cs eject electrons when exposed to light.
(ii) Lithium which has highest ionisation enthalpy among alkali metals cannot be used in photoelectric cells because it does not release electrons when exposed to light
3.
In a group, the density increases with increase in atomic number. But the density of 19K is less than 11Na.
Reason:
Atomic volume ofK is nearly twice of Na, but its mass (39) is not exactly double of Na (23).
Since density is inversely related to volume, the greater volume K has lower density than Na
4.
The alkali metals and their salts impart characteristic colour to an oxidizing flame.
This is because the heat from the flame excites the valence electron to a higher energy level.
When the excited electron comes back to the ground state there is emission of radiation in the visible region
5.
The high solubility of lithium salts is due to strong solvation of small size Li+ ion
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
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NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
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