Chemistry Question paper- Nagai District - Unit test English medium

                                                        NAGAI DISTRICT

                                            CHEMISTRY UNIT TEST 2020-21

                             Part-I                                                         TOTAL MARKS: 50

Write all the Questions                                                                                 10x1=10

1. Which of the following is strongest acid among all?

 a ) HI b) HF C) HBr d) HCl

2. Most easily liquefiable gas is

 a) Ar b) Ne c) He d)Kr

3. XeF6 on complete hydrolysis produces

 a)XeoF4 b) XeO2F2 c) XeO3 d) XeO2

4. The magnetic moment of Mn2+ ion is

 a) 5.92 B.M b) 2.80 B.M c) 8.95 B.M d) 3.90 B.M

5. The common oxidation state of actinoids is

 a)+2 b) +3 c) +4 d) +6

6. Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis

 Reason : Ce4+ has the tendency of attaining +3 oxidation state

a) Both assertion and reason are true and reason is the correct explanation of assertion

b) Both assertion and reason are true but reason is not the correct explanation of assertion.

c) Assertion is true but reason is false

d) Both assertion and reason are false

7. The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(ox)]cl is

a) 3 b) 6 c) -3 d) 9

8. IUPAC name of the complex k3[Al(C2O4)3] is

a) potassiumtrioxalatoaluminium(III)

b) potassiumtrioxalatoaluminate(II)

c) potassiumtrisoxalatoaluminate(III)d) potassiumtrioxalatoaluminate(III)

9) Oxidation state of Iron and charge on the ligand NO in [Fe(H2O)5NO]SO4 is

a) +2and 0 respectively b) +3 and 0 respectively c) +3 and -1 respectively d)+1and +1 respectively

10 which one of the following ions has the same number of unpaired electrons as present in V3+?

a)Ti3+

 b) Fe3+

 c) Ni2+

 d) Cr3+

 Part-II

Write any five of the following Questions                                                         5x2=10

11. Give the uses of argon

12. Write the valence shell electronic configuration of group -15 elements

13. which metal in the 3d series exhibits +1 oxidation state most frequently and why?

14. why do Zirconium and Hafnium exhibit similar properties?

15. Give the difference between double salts and coordination compounds

16. Classfiy the following ligands based on the number of donor atoms

 a) NH3 b) en c)OX2-

 d) pyridine

17) which one is strong reducing agent Cr2+ or Fe2+

                                                         Part-III

Write any five of the following                                                                         5x3=15

18) Write oxidation state of central metal ion, central metal ion,coordinationnumber, magnetic

property, nature of ligand and geometry for the complex K4[Fe(CN)6]

19. what are the limitations of VB theory?

20. out of Lu(OH)3 and La(OH)3which is more basic and why?

21. what are interstitial compounds?

22. Give the uses of helium

23. what is inert pair effect?

24. what are actinides? Give three example.

                                                 Part-III

Answer three of the followings                                             3x5=15

25. How will you prepare chlorine in the laboratory?

                                (or)

 Write the properties of Interhalogen compounds

26. compare lanthanides and actinides .

                                 (or)

 What is lanthanide contraction? Write the reason for it ,write the consequences of lanthanide

contraction

27. Write the postulates of Werner´s theory

                                         (or)

 On the basis of VB theory explain the nature of bonding (hybridisation)in [CO(C2O4)3]3-