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SECTION-A
1. The element that exhibits negative oxidation state in IIIA group elements is
(1) B
(2) Al
(3) Ga
(4) Tl
2. Boron halides are
(1) Electron efficient compounds
(2) Ionic compounds
(3) Lewis bases
(4) Used as refractory compounds
3. Inorganic graphite is
(1) (BN)n
(2) BF4
(3) B2H6
(4) B2N2H6
4. Which of the following is the correct formula of borax?
(1) Na2[B4O5(OH)4]. 2H2O
(2) Na2[B4O5(OH)4]. 4H2O
(3) Na2[B4O5(OH)4].6H2O
(4) Na2[B4O5(OH)4].8H2O
5. Borax glass is a mixture of
(1) NaBO2 + B2O3 (2) Na2B4O7+B2O3
(3) H2B4O7 + B2O3 (4) Na2B4O7.10H2O+B2O3
6. Boric acid is prepared from borax by the action of
(1) HCl
(2) NaOH
(3) CO2
(4) Na2CO3
7. Orthoboric acid (H3BO3) and metaboric acid (HBO2) differ in respect of:
(1) Basicity
(2) Structure
(3) Melting point (4) All the above
8. Number of simple covalent bonds (B-H) present in diborane
(1) 2
(2) 4
(3) 6
(4) 8
9. In diborane, banana bond is formed by
(1) 2 electrons, 3 atoms
(2) 2 electrons, 1 atom
(3) 2 electrons, 2 atoms
(4)1 electron, 2 atoms
10. The number of hydrogen atoms bridging the boron atoms in a diborance molecule is
(1) 1
(2) 2
(3) 3
(4) 6
11. In diborane, boron atoms undergo ——- type of hybridisation.
(1) sp
(2) sp2
(3) sp3
(4) sp3d
12. SiCl4 in presence of H2O give “X”, which in temperature 1000℃ give “Y”
in the above reaction, X and Y respectively are
(1) SiO2 and Si
(2) H4SiO4 and SiO2
(3) H2SiCl6 and SiO2
(4) H4SiO4 and Si
13. Aluminium is extracted from
(1) Magnetite
(2) Bauxite
(3) Aluminium
(4) Haematite
14. Assertion (A): SiO2 is used as an acidic flux in metallurgy
Reason (R): SiO2 removes basic impurities forming a slag
(1) Both A and R are true and R is correct explanation of A
(2) Both A and R are true and R is not correct explanation of A
(3) A is true but R is false
(4) A is false but R is true
15. Which of the following is the most stable oxidation state of aluminium (AFMC 99)
(1) -1
(2) +1
(3) +2
(4) + 3
16. Al and Ga have the same covalent radius because of
(1) Greater shielding of S – electrons of Ga atoms
(2) Poor shielding of S – electrons of Ga atoms
(3) Poor shielding of d – electrons of Ga atoms
(4) Greater shielding of d – electrons of Ga atoms
17. Assertion (A): Thallium compounds are stable in +1 oxidation state
– Reason (R): The 6s2 electrons in Tl show reluctanace in participating in bond formation
(1) Both A and R are true and R is correct explanation of A
(2) Both A and R are true and R is not correct explanation of A
(3) A is true but R is false
(4) A is false but R is true
18. Statements regarding the general characteristics of IIIA group elements
I) The decreasing order of E.N. of IIIA group elements is B > Tl > In > Ga > Al
II) The S.R.P. values decreases in the order Tl > In > Ga > B > Al
III) Ga has high melting point because of its polymeric structure
(1) I and II are correct
(2) II and III are correct
(3) Only II is correct
(4) I & III are correct
19. Assertion (A): Boron forms covalent compounds
Reason (R): Boron is an non metal
(1) Both A and R are true and R is correct explanation of A
(2) Both A and R are true and R is not correct explanation of A
(3) A is true but R is false
(4) A is false but R is true
20. Borax bead test is responded by:
(1) Divalent metals
(2) Heavy metals
(3) Light metal
(4) Metals which form coloured metaborates
21. BCl3 on hydrolysis gives
(1) B2O3 and HCl
(2) B2H6, HCl and O2
(3) H3BO3 and HCl
(4) B2O3, H2 and Cl2
22. Boric acid on heating yields
(1) B
(2) B2H6
(3) BO2
(4) B2O3
23. In diborane
(1) 4 bridged hydrogens and two terminal hydrogens are present
(2) 2 bridged hydrogens and four terminal hydrogens are present
(3) 3 bridged and three terminal hydrogens are present
(4) 1 bridged hydrogen and 5 terminal hydrogens
24. List -I List -2
A. Al2O3 1. Dimer
B. AlCl3 2. Non-metal
C. B 3. Acidic
D. B2O3 4. Amphoteric
The correct match is
A B C D
(1) 4 3 2 1
(2) 1 4 3 2
(3) 2 3 4 1
(4) 4 1 2 3
25. Which of the following elements has a limited Co-ordination number of four?
(1) Sn
(2) C
(3) Si
(4) Ge
26. Which of the following is solid at room temperature?
(1) CO
(2) CO2
(3) SiO2
(4) OF2
27. Assertion (A): Pb compounds are stable in +4 oxidation state
Reason (R): Pb exhibits inert pair effect
(1) Both A and R are true and R is correct explanation of A
(2) Both A and R are true and R is not correct explanation of A
(3) A is true but R is false
(4) A is false but R is true
28. Which of the following is an amphoteric oxide?
(1) CO2
(2) CO
(3) GeO2
(4) SiO2
29. Bond energy is highest for
(1) Sn-Sn
(2) Ge-Ge
(3) C-C
(4) Si-Si
30. The bond angle in diamond is
(1) 104.50
(2) 1070
(3) 1200
(4) 1090 28’
31. Which of the following is not an allotrope of carbon?
(1) Graphite
(2) Diamond
(3) Coke
(4) Carborundum
32. Hybridisation on carbon atoms in diamond is
(1) sp
(2) sp2
(3) sp3
(4) sp3d
33. List -I List -2
A. SiCl4 (1) SiO2
B. Tetrahedral (2) Acid-flux
C. Acheson’s process (3) Lewis Acid
D. SiO2 (4) Silicon
(5) Graphite
The correct match is
A B C D
(1) 1 2 4 3
(2) 5 1 2 4
(3) 3 1 5 2
(4) 3 2 4 1
34. Which of the following is true for diamond?
(1) It is a good conductor of electricity
(2) It is very soft
(3) It is a bad conductor of heat
(4) Diamond is made up of carbon, hydrogen and oxygen atoms
35. In complete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of
(1) CO + H2O
(2) CO
(3) NO2
(4) SO2
SECTION-B
ATTEMPT ANY 10 OF THE FOLLOWING SECTION
36. When oxalic acid is heated with concentrated H2SO4 it produces
(1) CO, CO2, H2O
(2) SO2, CO2, H2O
(3) CO, SO2, H2O
(4) SO2 , SO3, H2O
37. SiO2 is reacted with sodium carbonate. What is the gas liberated?
(1) CO
(2) O2
(3) CO2
(4) O3
38. Which is the anhydride of orthosilicic acid?
(1) Si
(2) SiO
(3) SiO2
(4) SiO3
39. Which oxide has three dimensional structures?
(1) CO2
(2) SO2
(3) CO
(4) SiO2
40. Which is used as an acidic flux in metallurgy?
(1) CO2
(2) Graphite
(3) Sand
(4) Gas carbon
41. Quartz is the form
(1) CO2
(2) SiO2
(3) SO2
(4) NO2
42. The structure of crystalline silica is similar to that of
(1) Diamond
(2) Graphite
(3) Silicates
(4) Silicic acid
43. Alkyl chloride when passed over silicon at 3000C in the presence of Cu catalyst gives
(1) R-S-Cl
(2) R2SiCl2
(3) R3SiCl
(4) R4Si
44. Which of the following bonds is present in silicone?
(1) Si-O-Si-O-Si
(2) Si-C-Si-O-Si
(3) Si-O-Si-C-Si
(4) Si-Si-Si-Si-Si
45. Silicones are used as.
(1) Conductors
(2) Insulators
(3) Semiconductors
(4) To prepare graphite
46. Silicones have the general formula
(1) SiO4-4
(2) Si2O76-
(3) (R2 SiO)n
(4) ( SiO3)n2n
47. The Si-O bonds in silicates are.
(1) Very strong
(2) Weak
(3) Very weak
(4) Moderate
48. In the softening of water when zeolites are exercised the following metal ion is replaced by Na+
(1) Ca+2
(2) Ba+2
(3) Be+2
(4) Zn+2
49. The order of the stability of dihalides of Si, Ge, Sn and Pb changes in sequence
(1) SiX2 << SnX2 << GeX2 << PbX2
(2) SiX2 << GeX2 << SnX2 << PbX2
(3) PbX2 << SnX2 << GeX2 << SiX
(4) GeX2 << SiX2 << SnX2 << PbX2
50. Assertion (A): Carbon forms a large number of compounds
Reason (R): Carbon has high catenation power.
(1) Both A and R are true and R is correct explanation of A
(2) Both A and R are true and R is not correct explanation of A
(3) A is true but R is false
(4) A is false but R is true
Answer key & solutions
