CBSE 12TH CHEMISTRY - Online Test
Q1. One of the statements below is not true for the classification of polymers can be classified on the basis of their
Answer : Option D
Explaination / Solution:
Polymer cannot be classified on the basis of their resistance to different agents.
Q2. Elements of which group are known as ore forming elements?
Answer : Option D
Explaination / Solution:
Maximum number of ores contain group16 elements (O, S etc). They are known as "chalcogens" which was derived from the Greek word chalcos , meaning "ore formers," since they all are be found in copper ores.
Q3. Pyrometallurgy is the process of
Answer : Option A
Explaination / Solution:
Pyro means heating. Pyrometallurgy is convertion of oxide to metal.
Q4. Which of the following ion has smallest radii?
Answer : Option A
Explaination / Solution:
In period when we move from left to right in a period atomic radii 1st decreases till nickel then starts increasing so Ni2+ has smallest radii.
Q5. Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.
Answer : Option A
Explaination / Solution:
Alcohols have higher boiling points than aldehydes.
Q6. The antibiotic effective against certain strains of cancer cells is
Answer : Option B
Explaination / Solution:
Dysidazin is effective against strains of cancer cell.
Q7. Effective atomic number of Fe in the complex K4[Fe(CN)6] is
Answer : Option B
Explaination / Solution:
26+2(6)-2=36
Q8. Charge on one mole of electrons - Faraday is approximately
Answer : Option B
Explaination / Solution:
Charge on one electron is 1.6 x C. 1 mole of electron 6.023x electrons. So charge on one electron is 1.6 x x 6.023 x = 96500 C
Q9. Which one of the following is not a chiral molecule?
Answer : Option C
Explaination / Solution:
.this
is not chiral molecule because functional group carbon that is carbon
having alchohal group has 2 same groups on either side and there is
symmentry about this carbon that is why this is not chiral.
.this
is not chiral molecule because functional group carbon that is carbon
having alchohal group has 2 same groups on either side and there is
symmentry about this carbon that is why this is not chiral.
Q10. The rate is independent of the concentration of the reactants in
Answer : Option A
Explaination / Solution:
−d[R]/dt = k[R]0
