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-
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