Define catenation. (1)
2. How does valency of an element vary across a period? (1)
3. What is the nature of the image formed at the retina of human eye? (1)
4. Name the reaction responsible for large energy production in the sun. (1)
5. Calculate the number of electrons consisting one coulomb of charge. (1)
6. How many covalent bonds are there in a molecule of ethane, C2H4. (1)
7. When a cell reproduces, whathappens to its DNA? (1)
8. Write the molecular formula of the 2nd and the 3rd member of the homologous series whose first member
is methane (1)
9. Name the largest cell present in the human body. (1)
10. What is a gene? (1)
Answers
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Answer:
æ æ the answer is option c
Answered by
1
Answer:
- catenation is the bonding of atoms of the same element into a series, called a chain.
- the valency accross period increses
- real and inverted
- fusion
- 6,240,000,000,000,000,000
- six bonds
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