Transition Element Quiz-19

Transition Element Quiz-19

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.  Which one of the following is a diamagnetic ion?

•   Co²⁺
•   Cu²⁺
•   Mn²⁺
•   Sc³⁺

Solution

Q2.  Transition metals in their compounds show:

•   Ionic bonds
•   Covalent bonds
•   Ionic and covalent bonds
•   Ionic and coordinate bonds

Solution
Transition elements show covalency as well as ionic valency, e.g., Mn²⁺ionic,Mn⁷⁺covalent.

Q3.  Silver is extracted from argentiferous lead by:

•   Mond’s process
•   Parkes process
•   Haber’s process
•   Bergius process

Solution
Parke’s process for desilverisation of lead involves extraction of Ag from Ag-Pb mixture.

Q4.  Duraluminium is an alloy contains:

•   Mg + Al
•   Mg + Cu + Al + Mn + Si
•   Mg + Cu
•   Cu + Al

Solution
A light hard aluminium alloy containing 4% Cu and small amounts of Mg, Mn and Si.

Q5. From an aqueous solution of zinc sulphate, normal zinc carbonate may be precipitated by:

•   Passing CO₂
•   Warming with NaHCO₃
•   Adding Na₂CO₃
•   Boiling with CaCO₃

Solution
  ZnSO₄+2NaHCO₃⟶ZnCO₃+CO₂+H₂O+Na₂SO₄

Q6.  Gold is extracted by hydrometallurgical process, based on its property

•   Of being electropositive
•   Of being less reactive
• To form complexes which are water soluble
•   To form salts which are water soluble

Solution
Hydrometallurgy is the process of dissolving the metal or its ore by the action of a suitable chemical reagent followed by recovery of the metal either by electrolysis or by the use of a suitable precipitating agent.
4Au+8KCN+2H₂O+O₂⟶4K[Au(CN)₂]+ 4KOH

                            air
2K[Au(CN)₂+Zn⟶2Au+K₂[Zn(CN)₄]

Q7. Among the following the coloured compound is

•   CuCl
•   K₃[Cu(CN)₄]
•   CuF₂
•   [Cu(CH₃CN)₄]BF₄

Solution
In CuF₂,Cu²⁺ion exist, having d⁹ configuration. Unpaired electron causes colour (d-d transition). In the crystalline form, CuF₂ is blue coloured.

Q8. Steel resistant to acid is:

•   Carbon steel
•   Molybdenum steel
•   Stainless steel
•   Nickel steel

Solution
Molybdenum steel is resistant to acid.

Q9. Transition elements are good conductors of current because:

•   They are metals
•   They are all solids
•   They have free electrons in outer energy orbits
•    All of the above

Solution
These are reasons for the given fact.

Q10.  Which metal gives hydrogen gas on heating with hot concentrated alkali?

•   Ag
•   Ni
•   Zn
•   Cu

Solution
Zn+2NaOH⟶ Na₂ ZnO₂+H₂
∴ Zn liberates hydrogen with hot conc. alkali.