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Thank you so much proving my thoughts right 👌👌

Ans. (d) When the electrons are trapped in anion vacancy, then the defect is called F-centres. This defect is observed in LiCl, NaCl, KCl, etc.

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💖💖 A single moment of misunderstanding can erase the beauty of a hundred loving moments in an instant This true but also no one can understand you completely they only think in their point of view ....💖💖

💖💖 Mujhe lagta hai ki hum kisiko chale jao bolte two cases me 1. Ki hame unke rahne na rahne se farak nahi padta 2. Hume 200% trust hota hai ki wo kabhi hamari life se nahi jayenge , ye Jo hamara trust hai n un par kabhi nahi todenge wo And these are special for us Isn't it right ?? 💖💖

Primary metabolites are compounds that are directly involved in the growth and development of a plant like amino acids and sugars (glucose). Primary metabolites prominently function growth, development and reproduction of cell. Secondary metabolites are compounds produced in other metabolic pathways that, although important, are not essential for the functioning of the plant

3 Rd Ozone is produced by action of ultraviolet and other high energy radiations on oxygen resulting in splitting and interaction of oxygen molecules3O2 →2O3 . This ozone forms a layer that is also called protective umbrella at 23 km from earth surface.

Second question ans:- Polyblend has proved to be a good material for the constructions of roads. It is a fine powder of recycled plastic and it is mixed with bitumen to lay roads. The first polyblend road was laid in Bangaluru by the effort of Ahmed Khan.

In 1973, the Chipko Movement (Chipko means to hug or stick to the trunk of the tree) was launched by Chandi Prashad Bhatt and Sunder Lal Bahuguna against large scale falling of trees by timber contractors in the Uttarakhand hills. The starting point was Chamboli district of Garhwal region in Uttarakhand.

The elements of second and third transition series resembles more in properties than the elements of first and second transition series. It is due to lanthanide contraction. So, due to lanthanide contraction Zr and Hf have the same radius and also known as twins.

Zinda ho 🧐🧐