Transition Element Quiz-14

Transition Element Quiz-14

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry. .

Q1.  The sandstone in some iron ores is removed by:

•   Carbon filters
•   Compressed air
•   Limestone
•   Sulphuric acid

Solution

 Haematite conatins SiO₂ (acidic) non-fusible impurity and this basic flux CaCO₃ is used. 

Q2.  The tempering of steel makes it:

•   Hard
•   Soft
•   Heavy
•   Brittle

Solution
This is definition of tempering of steel. The product obtained is neither so hard nor so brittle. It is softer than steel.

Q3.  Which set represents an example of non typical transition elements?

•   Zn, Cd, Hg
•   Sc, Ti, V
•   Cu, Ag, Au
•   Cr, Fe, Mn

Solution
The differentiating electrons enter the ns-orbital but they have configuration(n-1) d¹⁰ ns².

Q4.  Which metal sulphide is not black?

•   NiS
•   CoS
•   CuS
•   ZnS

Solution
ZnS is white. (Follow II gp. qualitative analysis).

Q5. Auric chloride on reaction with ferrous sulphate changes to:

•   Au
•   AuCl
•   Au₂ SO₄
•   Au₃ (SO₄)₂

Solution
  AuCl₃+3FeSO₄⟶Au+Fe₂ (SO₄)₃+FeCl₃

Q6.  Which chromium compound is widely used in tanning of leather?

•   Cr₂ O₃
•   CrO₂ Cl₂
• CrCl₃
•   K₂ SO₄.Cr₂ (SO₄)₃.24H₂ O

Solution
It is a use of chrome alum.

Q7. Which of the following weights less when weighted in magnetic field?

•   ScCl₃
•   FeCl₃
•   TiCl₃
•   VCl₃

Solution

Q8. Which statement is not correct?

•   Fe(CO)₅ reacts with Br₂ Cl₄
•   Carbonyl complexes are usually formed with transition metals
•   All transition metals form mono metallic carbonyls
•   The decomposition of Ni(CO)₄ to give Ni is used in the extraction of Ni by Mond’s process

Solution
Polymetallic carbonyls are also known for transition metals, .g., Co₂ (CO)₃.

Q9. Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as

•   Case hardening
•   Tempering
•   Sheradizing
•   Annealing

Solution
The process of hardening the surface of wrought iron by depositing a surface layer of steel on it is called case-hardening. It is done by heating wrought iron in contact with potassium ferricyanide
Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it in a suitable oil

Q10.  The purest zinc is made by

•   Electrolytic refining
•   Zone refining
•   The van- Arkel method
• The Mond process

Solution
Purest zinc is made by zone refining method.