Tag: chemistry

Questions Related to chemistry

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

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

  1. 9

  2. 5

  3. 3

  4. 6

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Correct Option: B

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?

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

  1. $2$

  2. $3$

  3. $1$

  4. $0$

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Correct Option: A
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 $=2.$

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

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

  1. 3,3

  2. 3, 6

  3. 6, 3

  4. 4, 2

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Correct Option: B
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.

Which of the following is not correctly matched ? 

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

  1. $[Fe (CN) _6]^{3-} d^2 sp^3$, paramagnetic

  2. $[Ni (CO) _4] -sp^3$, diamagnetic

  3. $[Fe(en) _3]^{+3} - sp^3 d^2$, paramagnetic

  4. $[FeCl _2 (H _2O) _2] sp^3$, paramagnetic

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Correct Option: A

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.

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

  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

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Correct Option: A

The primary velency of the cemtral transition metal ion in comlex compounds $[Cr(NH _3) _4CI _2]CI$

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

  1. 3

  2. 2

  3. 1

  4. 0

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Correct Option: A

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

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

  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. $All\ of\ these$

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Correct Option: D

The primary valency of iron in ${{\text{K}} _{\text{4}}}\left[ {{\text{Fe}}{{\left( {{\text{CN}}} \right)} _{\text{6}}}} \right]$ is 

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

  1. 1

  2. 2

  3. 3

  4. 4

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Correct Option: B

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

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

  1. $mol^2L^{-2}$

  2. $mol^3L^{-3}$

  3. $mol L^{-1}$

  4. $mol L^{-2}$

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Correct Option: C
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.

In $CuSO _4.5H _2O$ how many molecules of water are indirectly connected to Cu? 

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

  1. $5$

  2. $4$

  3. $2$

  4. $1$

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Correct Option: D
Explanation:

Solution:- (D) $1$

In $CuSO _4.5H _2O$, Four water molecules form coordinate bond with $Cu _{2+}$ ion while one water molecule is associated with $H$- bond