CBSE 12TH CHEMISTRY - Online Test
Q1. Cellulose, starch, resins and rubber belong to one of the following category of polymers
Answer : Option D
Explaination / Solution:
They all are natural polymers.
Q2. The most common oxidation states of nitrogen are
Answer : Option C
Explaination / Solution:
N shows -3 in NH3 , +3 in HNO2 and +5 in HNO3 .
Q3. Which among the following statement is correct?
Answer : Option C
Explaination / Solution:
All ores are minerals but vice versa is not true. Because ores are the minerals from which metal can be profitably extracted.
Q4. The inner transition metals of 5 f series is known as
Answer : Option D
Explaination / Solution:
inner transition metals of 5 f series is known as Actinoids.
Q5. Give the name of the following compound:
Answer : Option C
Explaination / Solution:
This is vanillin.
Q6. Ligand en is an example of
Answer : Option D
Explaination / Solution:
Q7. Paul Ehrlich was awarded Nobel Prize in medicine in 1908 for discovering the medicine to treat
Answer : Option C
Explaination / Solution:
He is awarded Nobel Prize in medicine for discovering in Syphilis.
Q8. Electrolytic cell is a device for using electrical energy to carry
Answer : Option C
Explaination / Solution:
Electrolytic cell converts non spontaneous chemical reaction to electrical energy using electricity.
Q9. The reaction RX + 2Na + RX _______________? R – R + 2NaX is called.
Answer : Option A
Explaination / Solution:
This name reaction wurtz reaction.when 2 moles alkyl halide reacts with sodium then it is called wurtz reaction.
Q10. The following compound can be called as
Answer : Option B
Explaination / Solution:
It is dextrotatory , as second last hydroxy group is in right position.
