Lakshya Education MCQs

Question: In a complex, the highest co-ordination number is
Options:
A.6
B.12
C.4
D.8
Answer: Option A
: A

According to Werner theory

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Question 1. In which of the following complexes, nickel is in the highest oxidation state?
  1.    K4[Ni(CN)4]
  2.    [K2NiF6]
  3.    [Ni(CO)4]
  4.    [Ni(CN)4]2−
Answer: Option B
: B

Nickel has + 4 oxidation state.
Question 2. Which of the following metal ion is present in Ziegler-Natta catalyst?
  1.    Fe2+
  2.    Zr4+
  3.    Rh+1
  4.    Ti4+
Answer: Option D
: D

This catalyst is made up of TiCl3+Al(C2H5)2Cl
Question 3. The Oxidation no. of Cr in [Cr(NH3)6]Cl3
  1.    8
  2.    6
  3.    4
  4.    3
Answer: Option D
: D

x + 6 × (0) + 3(–1) = 0
x = + 3
Question 4. The ion which is not tetrahedral in shape is?
  1.    BF−4
  2.    NH+4
  3.    [Cu(NH3)4]2+
  4.    NiCl2−4
Answer: Option C
: C

[Cu(NH3)4]2+ is square planar
Hybridazation state of Cu+2 is dsp2

Question 5. In the complex Fe(CO)x, the value of x is
  1.    3
  2.    4
  3.    5
  4.    6
Answer: Option C
: C

EAN = 36 so, 26 + 2 × n = 36
n = 5
Question 6. Which of the following is not correct?

Organometallics can play an ever expanding role in the production of
  1.    Pharmaceuticals
  2.    Agrochemicals
  3.    Flavours
  4.    None of these
Answer: Option D
: D

Organometallics are used to make all of these.

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