List of top Questions asked in Bihar Board Class XII

Going down of inorganic water soluble nutrients into the soil nutrients is called as
According to Robert May, how much is the global species diversity?
Biodiversity of India is what percentage of the total global species diversity?
What was the reason for extinction of more than 200 species of Cichlid fish in Lake Victoria?
Explain the following with examples: (i) Aldol condensation (ii) Cannizzaro's reaction
Write IUPAC names of the following compounds:
(i) CH₃-CH₂-COOH (ii) CH₂=COOH (iii) ClCH₂-COOH (iv) CH₃-CH=CH-COOH (v) CH₃-CO-CH₂-COOH
What is the use of alpha-1-antitrypsin?
Which of the following methods is used for the amplification of nucleic acid?
At what pH insecticidal protein synthesized by Bacillus thuringiensis becomes active?
RNA interference is utilized to prevent nematode infestation in tobacco plants. By which vector are nematode specific genes introduced?
How many varieties of Basmati rice are grown in India?
Which of the following organizations makes decision regarding the validity of GM research and the safety of introducing GM organisms?
Which is Rosenmund reduction?
How is a polypeptide bond formed?
Write the IUPAC names of the following compounds:
(i) \( \text{CH}_3\text{CH}_2\text{OH} \)
(ii) \( \text{CH}_3\text{CH}_2\text{CH}_2\text{OH} \)
What do you understand by rate of a reaction? What factors affect the rate of a reaction? Discuss.
What is soap? How does it act in the cleansing of clothes?
Write the principle of manufacture of ammonia by Haber’s process. How does it react with CuSO\(_4\) solution?
How would you distinguish among primary, secondary, and tertiary alcohols?
What is Schottky defect? Explain with example.
Why do transition elements form complex compounds?
Explain effective atomic number (EAN).
Write the names and formulae of two ores of iron.
Why is cryolite ore used during the extraction of Al metal?
Arrange F₂, Cl₂, Br₂, and I₂ in the increasing order of electron affinities.