Chapter wise -SAMPLE PAPER FOR COORDINATION COMPOUNDS

 

SUBJECT: CHEMISTRY          SAMPLE PAPER FOR  COORDINATION COMPOUNDS

TIME:   3 HOURS            MM:70 General Instructions: Read the following instructions carefully. a) There are 35 questions in this question paper with internal choice. b) SECTION A consists of 18 multiple-choice questions carrying 1 mark each. c) SECTION B consists of 7 very short answer questions carrying 2 marks each. d) SECTION C consists of 5 short answer questions carrying 3 marks each. e) SECTION D consists of 2 case- based questions carrying 4 marks each. f) SECTION E consists of 3 long answer questions carrying 5 marks each. g) All questions are compulsory. h) Use of log tables and calculators is not allowed SECTION A ( MCQs) 1. Which of the following compounds has tetrahedral geometry? (a) [Ni(CN)4]2- (b) [Pd(CN)4]2- (c [PdCl4]2- (d) [NiCl4]2- 1 2. K2[Fe(CN)6] is a/an (a) double salt (b) complex salt (c) acid (d) base 1 3. The number of possible isomers for the complex |Co(C2O4)2 (NH3)2| (a) 1 (b) 2 (c) 3 (d) 4 1 4. According to Werner’s theory of coordination compounds (a) Primary valency is ionisable (b) Secondary valency is ionisable (c) Primary and secondary valencies are lonisable (d) Neither primary nor secondary valency is ionisable 1 5. The ligand N(CH2CH2NH2)3 is (a) bidentate (b) tridentate (c) tetradentate (d) pentadentate 1 6. Among the following which are ambidentate ligands? (i) SCN– (ii) NO−3 (iii) NO−2 (iv) C2O2−4 (a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv) 1 7. Among the following ions which one has the highest paramagnetism ? (a)[Cr(H2O)6] 3+ (b) [Fe(H2O)6] 2+ (c) [Cu(H2O)6] 2+ (d) [Zn(H2O)6] 2+ 1 8. The complex ion which has no d-electrons in the central metal atom is (a) [MnO4]– (b) [Co(NH3)6]3- (c) [Fe(CN)6]3- (d) [Cr(H2O)6]3+ 1 9. The correct IUPAC name of the coordination compound K3|Fe(CN)5NO| is (a) Potassium pentacyanonitrosylferrate (II) (b) Potassium pentacyanonitroferrate (II) (c) Potassium nitritopentacyanoferrate (IV) (d) Potassium nitritepentacynanoiron (II) 1 10. Correct formulae of tetraaminechloronitroplatinum (IV) sulphate can be written as (a) [Pt(NH3)4 (ONO) Cl]SO4 (b) [Pt(NH3)4Cl2NO2]2 (c) [Pt(NH3)4 (NO2) Cl]SO4 (d) [PtCl(ONO)NH3(SO4)] 1 11. |Pt(NH3)4| |CuCl4| and |Cu(NH3)4||PtCl4| are known as (a) hybridization isomers. (b) coordination isomers (c) linkage isomers (d) polymerization isomers 1 12. The name of the linkage isomer of |C0(NH3)5NO2|Cl2 will be (a) pentaammonotrocobalt (II) chloride (b) pentaaminenitrochloridecobaltate (III) (c) pentaamminenitritocobalt (III) chloride (d) pentanitrosoamminechlorocobaltate(III) 1 13. Which of the following complex species is not expected to exhibit optical isomerism? (a) [Co(en) (NH3)2Cl2]+ (b) [Co(en)3]3+ (c)[Co(en)2Cl2] (d) [Co(NH3)3Cl3] 1 14. EDTA is used for the estimation of (a) Na+ and K+ ions (b) Cl– and Br– ions (c) Cu2+ and Cs+ ions (d) Ca2+ and Mg2+ ions 1 (A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. (B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion (C) Assertion is correct but Reason is incorrect (D) Assertion is incorrect but Reason is correct 1 15 Assertion : [Ti(H2O)6]3+ is coloured while [Sc(H2O)6]3+ is colourless. Reason : d-d transition is not possible in [Sc(H2O)6]3 as it has no unpaired electron. 1 16 Assertion : [Fe(CN)6]3– is weakly paramagnetic while [Fe(CN)6]4– is diamagnetic. Reason : [Fe(CN)6]3– has +3 oxidation state while [Fe(CN)6]4– has +2 oxidation state. 1 17 Assertion: Chelates are less stable than ordinary coordination compounds. Reason: Chelates can be formed by bidentate ligands. 1 18 1.      Assertion : Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason : Ambidentate ligand has two different donor atoms donating simultaneously. 1 SECTION : B 19 On the basis of crystal field theory,write the electronic configuration for d4 ion if Δo >P.Explain 2 20 When a coordination compound CrCl3.6H2O is mixed with AgNO3 ,2 moles of AgCl are precipitated per mole of the compound. Write structural formula & IUPAC name of the complex. OR Discuss the nature of Bonding in metal carbonyls. 2 21 What is meant by stability of a coordination compound in solution? State the factors which govern stability of complexes. Or Giving a suitable example for each, explain the following : (i) Linkage isomerism (ii) Ambidentate ligand 2     1+1 22. The formula Co(NH3) 5CO3Cl could represent a carbonate or chloride. Write structures and names of possible isomers. 2 23. [Co (NH3)6] +3 is an inner orbital complex whereas [Ni(NH3)6] +2 is an outer complex. 2 24. What is crystal field splitting energy? What are the various factors affecting CFSE. 2 25. What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand. 2 SECTION :C 26 a.Which complex ion is formed when undecomposed AgBr is washed with hypo solution in photography?Give reaction. b. Why only transition metals are known to form pi complexes? 1+2 27 A complex is prepared by mixing CoCl2 and NH3 In the molar ratio of 1:4, 0.1M solution of this complex was found to freeze at -0.372°c. what is the formula of the complex ? Given that molal depression constant of water (kf)=1.86c/m 3 28. a.Calculate the over all complex dissociation equilibrium constant for the[ cu(NH3)4]2+ ion , given that β for this complex is 2.1 x(10)13? b. Predict the number of unpaired electrons in the square planar [Pt(CN)4] 2- ion. 2+1 29. a. CuSO4.5H2O is blue in colour while CuSO4 is colouress. Why ? b. Magnetic moment of [MnCl4] 2- is 5.92BM. Explain giving reason . 2+1 30 a.Explain Coordination isomerism with example. b. Write down the applications of coordination compound Or a) Describe the shape and magnetic behaviour of following complexes : (i) [CO(NH3)6]3+ (ii) [Ni(CN)4]2-                  (At. No. Co = 27, Ni = 28) 1+2   1.5+1.5 SECTION :D 31 Read the given passage and answer the questions that follows. Negative ion or Neutral molecule which bound to the metal ion by secondary valency is called as ligand. In complex , metal ion acts as Lewis acid and ligand act as Lewis base. Ligands are classified according to number of electron pair in them. The ligand which can donates one e pair to the metal atom is called Unidentate ligand . The ligand which can donate two electron pair to the Metal ion is called didentate ligand. The ligand in which two or more coordination sites are there is called polydentate ligand. 75 Polydentate ligand forms cyclic structure with metal ion and form Chelate. i)   Give an example of unidentate neutral ligand. ii)   What are lewis acids and lewis bases. iii)  How didentate and Ambidentate ligands are different ? Give example. 1+1+2 32 Read the passage given below and answer the following questions: Coordination compounds are formulated and named according to the IUPAC system. Few rules for naming coordination compounds are: (I) In ionic complex, the cation is named first and then the anion. (II) In the coordination entity, the ligands are named first and then the central metal ion. (III) When more than one type of ligands are present, they are named in alphabetical order of preference with any consideration of charge.   ANSWER THE FOLLOWING QUESTIONS: -   (i) The IUPAC name of [Ni(CO)4] is (ii) The IUPAC name of the complex [Pt(NH3)3Br(NO2)Cl]Cl is (iii) As per IUPAC nomenclature, the name of the complex [Co(H2O)4(NH3)2]Cl3 is (iv) Which of the following represents correct formula of dichloridobis(ethane-1,2-diamine)cobalt(III) ion? 1+1+1+1 SECTION :E 33 (a) Account for the different magnetic behavior of hexacyanoferrate (III) and hexafluoroferrate (III). (b) (i) What type of isomerism is shown by the complex                 [Cr (H2O)6]Cl3 ? (ii) On the basis of CFT , write the electronic configuration for d4 ion if Δ0 > P . (iii) Write the hybridization and shape of [CoF6] 3- . Or a.(i) Write down the IUPAC name of the following complex : [Cr(NH3)2CI3(en)]Cl (en = ethylenediamine) (ii) Write the formula for the following complex : Pentaamminenitrito-o-Cobalt (III) b.Define the following terms; (a) Homoleptic complex ( b) Hetroleptic complex ( c) Coordination sphere 2+3         2+3 34 a. Which of the following is more stable complex and why? [Co(NH3)6]3+ and [Co(en)3]3+ b. Why are low spin tetrahedral complexes not formed? c. Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionization isomers? OR a. Compare the following complexes with respect to their shape, magnetic behaviour and the hybrid orbitals involved : (i) [CoF4]2- (ii) [Cr(H2O)2(C2O4)2]– (iii) [Ni(CO)4] (Atomic number : Co = 27, Cr = 24, Ni = 28) 1+2+2         1.5+2+1.5 35 For the complex [Fe(en)2Cl2], Cl, (en = ethylene diamine), identify (i) the oxidation number of iron, (ii) the hybrid orbitals and the shape of the complex, (iii) the magnetic behaviour of the complex, (iv) the number of geometrical isomers, (v) whether there is an optical isomer also, show and (vi) name of the complex. (At. no. of Fe = 26) OR a. With proper diagram explain crystal field splitting for octahedral complexes. b. What are t2g and eg orbitals ? Explain. ½+1+ 1/2+1+1+1       3+2

 

 

Hydrocarbons Saturated and Unsaturated hydrocarbon

 Hydrocarbons Saturated and Unsaturated  hydrocarbon

Hydrocarbons
01.	What are hydrocarbons ? Give examples.
02.	What are hydrocarbons ?				2024
03.	a.What is hydrocarbon ? Give its one example. b.Give structural difference between saturated and unsaturated hydrocarbons with two example each.				2019
04.	What are hydrocarbons ? Write the general formula of (i) saturated hydrocarbons, and (ii) unsaturated hydrocarbon and draw the structure of one hydrocarbon of each type. OR How can an unsaturated hydrocarbon be made saturated ?				2017 2013
Saturated Compounds (Alknaes)
1.	Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.
02	List two differences between saturated and unsaturated hydrocarbon.			2020
03.	a)     Name the simplest saturated hydrocarbon. Draw its electron dot structure. Which type of bonds exist in this compound ? b)    Name any two mixture of the carbon compound used as a fuel in daily life, of which the above mentioned compound is an important component. c)     In which homologous series of Carbon compound can this compound be placed ? Write the general formula of the series. d)    Which type of flame is produced on burning it ?			2023
04.	Butane had both Carbon – Carbon bonds as well as Carbon – Hydrogen bonds. Draw its structural formula and state the number of (1) C –H bonds and (2) C – C bonds in it.			2023
05.	Write the name and formula of simplest saturated hydrocarbon. Write the general formula of the homologous series of carbon compounds in which this compounds can be placed. Using this formula, find the 2nd member of this series. Write chemical equation for the reaction when this simplest hydrocarbon burns in air.			2023
06.	(i)   Why are carbon compounds exceptionally stable ?			2023

		(ii)    Differentiate between saturated and unsaturated compounds. Give structures of both the types of compounds having three carbon atom in their molecules.
07.		a)     Write the name and draw the structure of a saturated hydrocarbon with four carbon atoms. b)    Write the number of single covalent bonds present in this compound.		2022
08.		What is methane ? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds (i)   Poor conductors of electricity ? and (ii)  Have low melting and boiling points ? What happens when this compounds burn in oxygen ?		2019
09.		Why are most carbon compounds poor conductor of electricity ?		2018
10.		What is a saturated hydrocarbon ? Write the formula of any one saturated hydrocarbon.		2017
Unsaturated Compounds(Alkenes, Alkynes)
01.	Draw the electron dot structure of ethyne and also draw its structural formula.
02.	Differentiate between saturated and unsaturated carbon compounds on the basis of their general formula.			2023
03.	Write two points of difference between saturated and unsaturated hydrocarbons giving one example of each. Write the general formula of alkyne series. Wrtie the name and structure of second member of this series.			2017
04.	Give a chemical test to distinguish between saturated and unsaturated hydrocarbons.			2013
05.	Why is the melting and boiling points of C4H8 higher than that of C3H6 or C2H4 ?			2024
06.	Consider the carbon compounds having following molecular formula :  i)    C3H6         (ii) C3H8 (iii) C4H6 (iv) C6H6                 (v) C6H12 a) State the number of double covalent bonds present in C3H6. b) Write the formula of first member of the homologous series to which the carbon compounds of C4H8 belongs. c) Which one of the above compounds forms ring structure of carbon atoms ? d) Identify, Which of the above compounds, is a member of alkane series.			2022
07.	Unsaturated hydrocarbons contain multiple bonds between two carbon atoms and these compounds show addition reactions. Out of saturated and			2019

	unsaturated carbon compounds, which compounds are more reactive ? Write a test to distinguish ethane from ethene.
08.	Which compounds are called (i) alkanes (ii) alkenes and (iii) alkynes ? C4H10 belongs to which of these ? Draw structural isomers of this compound.			2019
09.	The general formula of the organic compounds ‘A’, ‘B’ and ‘C’ is CnH2n. Their boiling points are -162 oC, -42.2 oC, and –0.5oC respectively. Based on this information answer the following : a)     Which types of compound ‘A, ‘B’ and ‘C’ are and why ? b)    Which of these has maximum number of carbon atoms in the molecule and why ? c)        Write the name and structural formula of the second member of this series.			2017
10.	Give reasons for the following : a)     Unsaturated hydrocarbons show addition reaction but not saturated hydrocarbons b)    Carbon forms only covalent bonds.			2011
11.	The cap of plastic bottle shown in the figure is made up of polypropene and the bottle is made of polyethene. a)     Why are polyethene and polypropene is not ecofriendly with us ? b)    Differentiate between ethane and ethene and write the one important uses of ethane.			2014
12.	a)     Differentiate between alkanes and alkenes. Name and draw the structure of one member of each. b)    Alkanes generally burn with clean flame. Why ?			2013
Rings
01.	Write the structure of benzene.		2023
02.	Write the structural formula of benzene, C6H6.		2019
03.	Write the name and structure of a saturated compound in which the carbon atoms are arranged in a ring. Give the number of single bond present in this Compound.		2018
04.	Draw the structure of the molecule of cyclohexane.		2024& 2020
05.	a)    Write the molecular formula of benzene and draw its structure.		2022

	b)    Write the number of single and double covalent bonds present in a molecule of benzene. c)     Which compound are called alkynes ?
06.	Name a cyclic unsaturated carbon compound.	2020
07.	Write the molecular formula of benzene and draw its structure. List in tabular form the two properties in which covalent compounds differ from ionic compounds.	2017
08.	Compare the structure of benzene and cyclohexane by drawing them.	2017