can u tell me this question plz guys
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21-2,22-4,23-2 this is options
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Q. 20 (1)
Q. 21 (4)
Q. 22 (2)
Step-by-step explanation:
Q. 20 (1)
Allotropes are different forms of same element. Different bonding arrangements between atoms result in different structures with different properties.
Ozone is an allotrope of oxygen
Q.21 (4)
1. Energy of massless particles
E = pc
2. ψψ* = a² + b²
3. Since the third one talks about numbers in column A, the only number in column B is Four
4. Mutual repulsion of atomic electron is related to Hund's Rule
Q.23 (2)
First organic compound that was synthesised in laboratory was Urea
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