THE D-AND F-BLOCK ELEMENTS Quiz-19

D and F block elements Quiz-19

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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. A jeweler is selling 22-carat gold articles with 95% purity, it is approximately

•  Exact
•  3.5% higher
•  3.5% lower
•  5% lower

Solution
b

Q2.Cr²⁺ and Mn³⁺ both have d^4 configuration. Thus

•  Both are reducing agents
•  Both are oxidizing agents
•  Cr²⁺ is an oxidizing agent while Mn³⁺ is a reducing agent
•  Mn³⁺ is an oxidizing agent while Cr²⁺ is a reducing agent

Solution
d

Q3.  The oxidation number of Mn in the product of alkaline oxidative fusion of MnO₂ is

•  2

 3

 4

 6

Solution
d

Q4. Four successive members of the first row transition elements listed below with atomic numbers. Which one of them is expected to have the highest E°_{(M³⁺/M²⁺)} value?

•  Cr(Z=24)
•  Mn(Z=25)
•  Fe(Z=26)
•  Co(Z=27)

Solution
d

Q5.Stability of Cu⁺ and Ag⁺ halide complexes are in the order

•  I>r>Cl>F
•  F>Cl>Br>I
•  Cl>F>I>Br
•  Br>I>Cl>F

Solution
a Larger anion stabilizes to a greater extent

Q6. Based on the following equilibria

Select the correct statements

•  Iron in +2 state is more stable than in +3 state
•  Unstable ion can be stabilized by complexing it with a suitable ligand
• Both (a) and (b)
•  None of the above are correct statements

Solution
c

Q7. Which one of the following characteristics of the transition metals is associated with their catalytic activity?

•  Colour of hydrated ions

 Variable oxidation states

 High enthalpy of atomization

 Paramagnetic behavior

Solution
b

Q8.Non-stoichiometry is shown

•  Due to variable valency of transition elements
•  Due to defects in solid structures
•  Due to both (a) and (b)
 Due to none of the above

Solution
c

Q9.Silver nitrate solution is kept in brown bottles in the laboratory because

•  It reacts with ordinary bottles
•  Ordinary bottles catalyst the decomposition
•  The materials of brown bottles doo not react with it
•  Brown bottles cut the passage of light through it

Solution
d

Q10. Which of the following statements is not correct?

•  La(OH)₃ is less basic than Lu(OH)₃
•  In lanthanide series ionic radius of Ln³⁺ ion decreases
•  La is actually an element of transition series rather lanthanide
• Atomic radius of Zr and Hf are same because of lanthanide contraction

Solution
a