THE D-AND F-BLOCK ELEMENTS Quiz-9

D and F block elements Quiz-9

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything. .

Q1. MnO₄^2- (1 mol) in neutral aqueous medium disproportionate to

•  2/3 mol of MnO₄^- and 1/3 mol of MnO₂
•  1/3 mol of MnO₄^- and 2/3 mol of MnO₂
•  1/3 mol of Mn₂O₇ and 1/7 mol of MnO₂
•  2/3 mol of Mn₂O₇ and 1/3 mol of MnO₂

Solution
a

<

Q2.Some of the following reagents are used as primary standard I: KMnO₄; II: NaOH; III: K₂Cr₂O₇; IV: FeSO₄∙(NH₄)₂SO₄∙6H₂ O V: H₂C₂O₄∙2H₂O Select the primary standard

•  All except II, IV
•  All except I, II
•  All except I, II, III
•  Only IV

Solution
b

Q3.   Select the correct order of sizes of different species

•  Zr=Hf;Nb=Ta;Fe=Co=Ni
•  Zr⁴⁺3+ 3+,Fe³⁺2+
•  Zr⁴⁺=Hf⁴⁺;Nb³⁺=Ta³⁺;Fe
•  Zr⁴⁺4+,Nb³⁺=Ta³⁺,Ni

Solution
a

Q4. Stainless steel does not rust because

•   Chromium and nickel combine with iron
•   Chromium forms an oxide layer and protects iron from rusting
•   Nickel present in it, does not rust
•   Iron forms a hard chemical compound with chromium present in it

Solution
b

class="question"

Q5. AgCl and NaCl are colourless. NaBr and NaI are also colourless but AgBr and AgI are coloured. This is due to

•  Ag⁺ polarises Br^- and I^-
•  Ag⁺ has unpaired d-orbital
•  Ag⁺ depolarises Br^- and I^-
•  None of the above is correct

Solution
a

Q6.  Among K, Ca, Fe and Zn the element which can form more than one binary compound with chlorine is

•  Fe
•  Zn
• K
•  Ca

Solution
a

Q7. NH₄Cl is used to clear metal surface because

•  It dissociates into NH₃and HCl on heating
•  NH₃forms soluble complexes with the metal
•  HCl forms a volatile
•  None of the above

Solution
b

Q8.Stainless steel contains

•  Fe+Cr+Cu
•  Fe+C+Ni
•  Fe+Cr+Ni
•  Fe+Ni+Cu

Solution
c

Q9.Select the correct statement

•  Fe and Mo atoms are present in nitrogen fixing enzymes
•  A cobalt atom lies at the centre of the vitamin B₁₂ coenzyme
•  Fe atoms are involved in the ferrodoxins of photosynthetic process
•  All of the above are correct statements

Solution
d

Q10. Lanthanide and actinides resemble in

•  Electronic configuration
•  Oxidation state
•  Ionization energy
• face="Arial, Helvetica, sans-serif"> Formation of complexes

Solution
b

<!--script src="https://code.jquery.com/jquery-3.2.1.min.js" integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4=" crossorigin="anonymous">