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Q. No.Which loses weight on exposure to the atmosphere ?
1. Concentrated H2SO4
2. Solid NaOH
3. A saturated solution of CO2
4. Anhydrous sodium carbonate
Difficulty Level:
Which of the following compound is weakest Lewis acid ?
(1) BF3
(2) BCl3
(3) BBr3
(4) BI3
Difficulty Level:
The element among the following does not show inert pair effect is-
1. Al
2. Sn
3. Pb
4. Thallium
Difficulty Level:
Pick the correct statement :
(1) Borax is white crystalline solid containing [B4O5(OH)4]2- units
(2) Aqueous solution of borax is acidic in nature.
(3) Cobalt gives green colour in borax bead test.
(4) All are incorrect.
Difficulty Level:
An amphoteric oxide among the following is-
1. CO2
2. CO
3. SnO2
4. CaO
Difficulty Level:
In B2H6
(1) there is direct boron-boron bond
(2) the structure is similar to that of C2H6
(3) the boron atoms are linked through hydrogen bridges
(4) all the atoms are in one plane
Difficulty Level:
From the B2H6 all the following can be prepared except:
(1) H3BO3
(2) [BH2(NH3)2]+ [BH4]-
(3) B2(CH3)6
(4) NaBH4
Difficulty Level:
Which of the following shows correct Lewis acidic strength order of trihalides of boron ?
(1) BCl3 > BBr3 > BF3 > BI3
(2) BF3 < BBr3 < BCl3 < BI3
(3) BF3 < BCl3 < BBr3 < BI3
(4) BF3 >BCl3 > BBr3 > BI3
Difficulty Level:
The correct order of ease of hydrolysis is
1. CCl4 < SiCl4 < PCl5 < AlCl3
2. AlCl3 < CCl4 < PCl5 < SiCl4
3. CCl4 < AlCl3 < PCl5 < SiCl4
4. CCl4 < AlCl3 < SiCl4 < PCl5
Difficulty Level:
The number of carbon atoms per unit cell of diamond unit cell is:-
1. 4
2. 8
3. 6
4. 1
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