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Coordination Compounds Test - 9

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Coordination Compounds Test - 9
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  • Question 1
    4 / -1

     

    A filter paper moistened with ammoniacal sodium nitroprusside solution turns violet on contact with a drop of alkaline Na2S solution .The violet colour is due to the formation of

    Solution

     

    Na2S + Na2[Fe(CN)5NO] →

     

  • Question 2
    4 / -1

    Wilkinson’s catalyst is

    Solution

    Wilkinson’s catalyst is a rhodium complex [(Ph3P)3RhCI] and it is used as a catalyst for hydrogenation of alkenes reactions.

  • Question 3
    4 / -1

    Tollen’s reagent contains

    Solution

    Tollen's reagent (ammonical silver nitrate solution) which is a colorless, basic, aqueous solution containing silver ions coordinated to ammonia; [Ag(NH3)2]+.

  • Question 4
    4 / -1

    The compound formed by dissolving gold and platinum in aqua-regia is

    Solution

  • Question 5
    4 / -1

    Among the following, which is not the n-bonded organometallic compound?

    Solution

    (CH3)4 Sn is a σ-bonded organometaiiic compound.

  • Question 6
    4 / -1

    Which of the following biomolecules contain a non-transition metal ion?

    Solution

    The pigment responsible for photosynthesis, i.e. chlorophyll is a coordination compound of magnesium.

  • Question 7
    4 / -1

    In black and white photography, the developed film is fixed by washing with hypo solution which dissolves the undecomposed AgBr to form a complex ion formed is

    Solution

    2Na2S2O3 + AgBr → Na3[Ag(S2O3)2]+ NaBr

  • Question 8
    4 / -1

    In the estimation of hardness of water, the reagent used is

    Solution

    The quantity of Ca, Mg salts in water is estimated by using standard EDTA solution using erichrome black T as an indicator.

  • Question 9
    4 / -1

    Which of the following is powerful cr-donor and n-acceptor ligand?

    Solution

    CO as ligand is sigma donor and pi acceptor ligand.This is called pi-acid.

  • Question 10
    4 / -1

    Fe2+ and Fe3+ can be distinguished by

    Solution


  • Question 11
    4 / -1

     

    Primary and secondary valency of Pt in [Pt(en)2CI2] are

    Solution

     

    In [Pt(en)2CI2] the charge on the complex ion is +2 and coordination number is 6. Hence, the primary and secondary valency are +2 and 6 respectively.

  • Question 12
    4 / -1

     

    Which is the incorrect ?

    Solution

     

    Mohr's salt is a doub le salt and it will give test for Fe2+ ion. It dissociates into simple substances or ions completely when dissolved in water.

  • Question 13
    4 / -1

     

    Complexes in which the oxidation number of a metal is zero is/are

    Solution

     

    In [Ni(CO)4]
    Let the oxidation state of Ni is x.
    x + 4 x (0) = 0 (Carbonyl (CO) is a neutral ligand and have zero charge.)
    x = 0
    Hence, Ni have zero oxidation state.

  • Question 14
    4 / -1

     

    An example for bidentate and negatively charged ligand is

    Solution

     

    CH3COCH2COCH3

  • Question 15
    4 / -1

    How many of the following combinations in an aqueous medium will give a blue colour or precipitate?

    Solution


  • Question 16
    4 / -1

    Comprehension Type

    Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Coordination compounds play a vital role in our lives. The importance of these compounds can be realised from the fact that life would not have been possible without the existence of chlorophyll in plants and haemoglobin in the blood of the animals. The field of such compounds has expanded very fast in recent years and coordination compounds are playing important roles in analytical chemistry, polymerisation reactions, metallurgy and refining of metals, etc.

    Q. 

    The reagent used for identifying nickel ion is

    Solution

  • Question 17
    4 / -1

    Coordination compounds play a vital role in our lives. The importance of these compounds can be realised from the fact that life would not have been possible without the existence of chlorophyll in plants and haemoglobin in the blood of the animals. The field of such compounds has expanded very fast in recent years and coordination compounds are playing important roles in analytical chemistry, polymerisation reactions, metallurgy and refining of metals, etc.

    Q. 

    Which is used in cancer chemotherapy?

    Solution

    cis-dia m m inedichlo roplatin um (II), [cis[Pt(NH3)2CI2] is used in cancer chemotherapy.
    The mechanism of cis-platin is based on Pt-DNA interaction. Platinum binds with N7 of two intrastrand adjacent guanine bases of DNA.
    Their binding changes the active conformation of DNA leading to inhibiting of DNA replication or cell division.
    cis -Pt(NH3)2CI2 + H2O .......cis - [Pt(NH3)2(OH)2CI]+ + Cl- 
    The hydrolysis reaction of cis-platin is an important aspect of the biological activity.
    DNA coordinated trans complex begin to decrease after six hour whereas the cis-isomer is then accumulated in the cell nucleus.

  • Question 18
    4 / -1

    Matching List Type

    Direction (Q. Nos. 18 and 19) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d) out of which one is correct.

    Q. 

    Match the Column I with Column II and mark the correct option from the codes given below.

    Solution

    (i) → (r), (ii) → (q), (iii) → (s), (iv) → (p)

  • Question 19
    4 / -1

    Match the Column I with Column II and mark the correct option from the codes given below.

    Solution

    (i) → (p,r), (ii) → (s), (iii) → (q), (iv) → (t)

  • Question 20
    4 / -1

     

    Direction (Q. Nos. 20-24) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. The number of terminal carbonyl groups present in Fe2(CO)9 are

     

    Solution

     


    Fe2(CO)9 contains 3 bridging CO groups placed symmetrically around the (Fe—Fe) bond and 6 terminal carbonyl groups.

     

  • Question 21
    4 / -1

     

    In Fe2(CO)9, the number of CO present between iron atoms ......

     

    Solution

     

    Fe2(CO)9 has three bridging CO groups.

     

  • Question 22
    4 / -1

     

    In [Co2(CO)8], the number of CO molecules lying between the metal atoms are

     

    Solution

     


    Each cobalt atom is bonded to three terminal CO group and share two CO ligands as bridging groups.

     

  • Question 23
    4 / -1

     

    The number of M—M bonds in [Ir4(CO)12] are

     

    Solution

     

    Each Ir bonded to three iridium atoms and three CO molecules. The number of Ir— Ir bonds are 6.

     

  • Question 24
    4 / -1

     

    In Mn2(CO)10, the number of CO molecules in between the metal atoms are

     

    Solution

     

    Mn(CO)5 is radical with 17-electron configuration. Therefore, it undergoes dimerisation through the formation of M—M single bonds and complex their valence shells to avoid ligand-ligand repulsion the Mn(CO)5 units acquire staggered configuration.

     

  • Question 25
    4 / -1

    Statement Type

    Direction (Q. No. 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Statement I : Mn(π— C3H5)(CO)4, obey effective atomic number rule.

    Statement II : π-allyl ligand act as a 3e- donor.

    Solution

    In Mn(π -C3H5) (CO)4
    Mn= 25
    π-C3H5 = 3
    4 (CO) = 8
    Hence, EAN = 36
    Hence, π-C3H5 ligand acts as a 3-electron donor and complex obey effective atomic number rule.

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