Download App

The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements3 Marks
Question
Identify the metal and justify your answer.
  1. Carbonyl M (CO)5
  2. MO3F
✓

Answer

It is = 0

x = +7M is in +7 oxidation state so that the given compound is MnO3F

  1. Fe(CO)5 by EAN rule

EAN = x + 2 × 5 = 36 (Kr is the nearest inert gas)

x = 26 (atomic no. of the metal) so the metal is iron.

  1.  MO3F is MnO3F

In MO3F let us assume M = x

x + 3 × (-2) + (-1)

x = +7

M is in + 7 osidation state so that the given compound is MnO3F

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from The d & f Block Elements→The d & f Block Elements — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Although chlorine is an electron withdrawing group, yet it is ortho, para directing in electrophilic aromatic substitution reaction, Explain.
→
Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?
→
The conductivity of sodium chloride at 298 K has been determined at different concentrations and the results are given below:
Concentration/M 0.001 0.010 0.020 0.050 0.100
102× k/S m-1 1.237 11.85 23.15 55.53 106.74
Calculate $\wedge_\text{m}$ for all concentrations and draw a plot between $\wedge_\text{m}$ and $\text{C}^\frac{1}{2}.$ Find the value of $\wedge^\circ_\text{m}.$
→
Write the chemical equation for the following conversion (not more than 2 steps):
Ethyl benzene to benzene.
→
A first order reaction has a rate constant of 0.0051 min–1. If we begin with 0.10 M concentration of the reactant, what concentration of reactant will remain in solution after 3 hours?
→
Explain the preparation of ethers with mech- anism by dehydration of alcohols.
→
  1. What type of isomerism is shown by the complex [Co(NH3)5 (SCN)]2+?
  2. Why is [NiCl4]2- paramagnetic while [Ni(CN)4]2- is diamagnetic? (Atomic number of Ni = 28)
  3. Why are low spin tetrahedral complexes rarely observed?
→
The molar conductivity of 0.025 mol L–1 methanoic acid is 46.1 S cm2 mol–1. Calculate its degree of dissociation and dissociation constant. Given λ0 (H+) = 349.6 S cm2 mol–1 and λ0 (HCOO–) = 54.6 S cm2 mol-1.
→
Give reason:
(i) Transition elements exhibit higher enthalpies of atomisation.
(ii) In aqueous solution, $Cr ^{2+}$ is stronger reducting agent than $Fe ^{2+}$.
(iii) The second ionisation enthalpy of Cu is higher then $Z n$.
→
Describe the trends in the following properties of the first series of the transition elements:
  1. Oxidation states.
  2. Atomic sizes.
  3. Magnetic behaviour of dipositive gaseous ions (M2+).
→