CBSE 12TH CHEMISTRY - Online Test
Q1. Volume of unit cell occupied in face centered cubic arrangement is
Answer : Option D
Explaination / Solution:
Packing Fraction is 74%
Q2. Identify the type of polymer. —A—A—A—A—A—A—
Answer : Option A
Explaination / Solution:
Since only one monomer unit is present so it is Homopolymer.
Q3. How many carats are in 87.5% gold?
Answer : Option B
Explaination / Solution:
Karat = 24 × (MgMm)Mg= 87.5 and Mm= 100
Q4. One mole of a symmetrical alkane on ozonolysis gives two moles of an aldehyde having molecular mass of 44u. The alkene is.
Answer : Option A
Explaination / Solution:
2-butene on reductive ozonolysis will give CH3CHO which has molecular mass of 44u.
Q5. Lithiumtetrahydridoaluminate is represented as
Answer : Option A
Explaination / Solution:
Lithiumtetrahydridoaluminate is Li[AlH4]
Q6. A sample of water was found to contain ions. Which of these will be preferred for washing clothes?
Answer : Option D
Explaination / Solution:
Detergents
Q7. The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S . Calculate its molar conductivity.
Answer : Option C
Explaination / Solution:
Q8. Boron is unable to form BF6− ion.
Answer : Option D
Explaination / Solution:
Boron cannot expand its covalency due to absence of d orbitals.
Q9. The unit of rate constant for a first order reaction is
Answer : Option C
Explaination / Solution:
Unit of k = mol L−1s−1/ mol L−1
Q10. Which is correct in case of Vander waals adsorption?
Answer : Option B
Explaination / Solution:
Physiadsorption is favoured only at low temperature and high pressure.
