The d- and f- Block Elements - Online Test

Q1. Which one of the following is an example of non – typical transition elements?
Answer : Option A
Explaination / Solution:

Zn, Cd and Hg are not considered as transition elements because they donot have incompletely filled d orbital in its ground state or stable oxidation state

Q2. Zr and Hf have almost equal atomic and ionic radii because
Answer : Option A
Explaination / Solution:

Due to presence of Lanthanide series in which electron enter f orbital which have poor shielding effect size of 5d series and 4d series doesnot change much . this is known as lanthanide contraction.

Q3. What is the shape of Fe(CO)5 molecule?
Answer : Option A
Explaination / Solution:

CN is 5.

Q4. Which of the following compound is amphoteric?
Answer : Option A
Explaination / Solution:

Cr(OH)3is amphroteric.
Q5. Which of the following sulphides is soluble in aqua regia?
Answer : Option C
Explaination / Solution:

HgS is only soluble in aqua regia

Q6. Silver is refined by cupellation process. The process removes the impurity of
Answer : Option D
Explaination / Solution:

Cupellation removes the impurity of Pb.

Q7. Mohr’s salt is a better volumetric agent then ferrous sulphate because
Answer : Option B
Explaination / Solution:

Mohr’s salt is a better volumetric agent then ferrous sulphate because it is less readily oxidised in the solid state. Also Mohr salt is more stable than FeSO4.
Q8. Red hot steel rods on suddenly immersing in water become
Answer : Option B
Explaination / Solution:

Red hot steel rods on suddenly immersing in water become hard and brittle.

Q9. Which of the following methods is based on distribution law?
Answer : Option B
Explaination / Solution:

Parkes process is a process for removing silver from Pb. It is an example of Liquid liquid extraction.s

Q10. Which of the following methods is based on distribution law?
Answer : Option B
Explaination / Solution:

Parkes process is a process for removing silver from Pb. It is an example of Liquid liquid extraction.s