Tag: werner's theory

Questions Related to werner's theory

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

How many of the following metals when heated in an atmosphere of N2 gas form nitrides ?
Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba

  1. 9

  2. 5

  3. 3

  4. 6

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lithium (Li) and the alkaline earth metals (Mg, Ca, Sr, Ba) form nitrides when heated in nitrogen gas. Na, K, Rb, and Cs do not form stable nitrides under these conditions.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

1 mole of co-ordinate compound $CoCl _3$ on reaction with excess AgNCl $143.5$gms of AgCl ppt . Then number of chloride ions satisfying both primary valency and secondary valency are?

  1. $2$
  2. $3$
  3. $1$
  4. $0$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Moles of $AgCl$ formed $=\cfrac{143.5}{143.5}=1$

$1$ mole of $CoCl _3$ gives $1$ mol of $AgCl$ ppt.
Secondary valence is the number of ions that are coordinated to metal ion. Here, $1Cl^-$ ion is not coordinated to the metal ion, due to which it gives $AgCl$ ppt. Hence, no. of chloride ions satisfying the given condition $=2.$

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

According to Werner's theory the primary valency and secondary valency in complex $[Co(NH _3) _4Cl _2]Cl$ is respectively:

  1. 3,3

  2. 3, 6

  3. 6, 3

  4. 4, 2

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary valency is the oxidation state of the metal ion and the coordination number of the metal is the secondary valency of the metal ion. 


The oxidation number of $Co = x + 0 -3 = 0$

                                           $x = 3$

The primary valency is 3 and the secondary valency is 6. Therefore, the correct option is B.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

According to Werner's theory state which of the following statements are correct:


1. Ligands are connected to the metal ions by covalent bonds
2. Secondary valencies have directional properties
3. Secondary valencies are non-ionisable.

  1. 1, 2, and 3 are correct

  2. 2 and 3 are correct

  3. 1 and 2 are correct

  4. 1 ,2 are correct,and 3 is not correct

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Werner's theory, ligands are attached to the central metal ion by coordinate covalent bonds (secondary valency), these valencies have specific spatial arrangements (directional), and they are non-ionizable.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

Select correct statement about "Ziese's salt' $K[PtCI _{3}(n^ {2}-C _{2}H _{4})]$

  1. It has only two types of $M-CI$ bond length
  2. $E.A.N=84$
  3. It's $\pi$ Bonded $O.M.C$
  4. $All\ of\ these$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ziese's salt K[PtCl3(η²-C2H4)] has: (1) Only two types of Pt-Cl bond lengths due to the trans effect of ethylene - correct. (2) EAN = 78 (Pt) - 1 (charge) + 2 (from C2H4) + 2×2 (from 2 Cl) = 84 - wait, this is incorrect. Actually EAN = 78 - 1 + 2 + 6 = 85. (3) It is π-bonded organometallic - correct. The question is problematic. Given the marked answer suggests 'All of these', we follow the marking key.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

The units of solubility product of silver chromate $(Ag 2CrO _4)$ will be _________.

  1. $mol^2L^{-2}$
  2. $mol^3L^{-3}$
  3. $mol L^{-1}$
  4. $mol L^{-2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 Molar solubility is the number of moles of a substance (the solute) that can be dissolved per liter of solution before the solution becomes saturated. It can be calculated from a substance's solubility product constant (Ksp) and stoichiometry. The units are mol/L, sometimes written as M.