GROUP 3A ELEMENTS
GROUP 3A ELEMENTS
Total Questions: 30
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1. Boron in the soil has been considered a micronutrient for...
Proper growth of plants
2. One special feature of Borosilicate glass is that it is...
Heat resistant
3. The metal which is used in the thermite process due to its reactivity is...
Aluminium
4. Aluminium oxide is a(n)...
Amphoteric oxide
5. One of the following shows inert pair effect
Tl
6. Which of the following electronic configuration is typical of a Group 3A element?
1s2 2s2 2p6 3s2 3p1
7. Tincal is a mineral of...
B
8. The process of Aluminium extraction is called...
Hall–Heroult process
9. If the temperature of Gallium arsenide was increased, then its conductivity will...
Increase
10. Aluminium does not react with HNO3 at any concentration, therefore, HNO3 is transported in Aluminium containers, this is due to formation of protective layer of...
Aluminium oxide
11. Which of these elements show maximum inert pair effect?
Tl
12. If a metal is protected by an oxide layer from further attack, the metal is said to be...
Passive
13. The octet rule is not followed by...
Boron in BCl3
14. One of the following is not metallic in nature
Boron
15. Hall's process is based on electrolysis of _
Alumina
16. In the commercial electrochemical process for Aluminium extraction, the electrolyte used is...
A molten mixture of Al2O3 and Na3AlF6
17. Aluminium is diagonally related to
Be
18. Which of these elements is unstable in air and is oxidized superficially?
Tl
19. Boron is a metalloid and semiconductor like...
Si
20. In P-block elements, the s-electrons of the outer shell of the heavier members fail to participate in bonding, this is because they...
Remain paired
21. Boron forms _ bonds in its compounds
Covalent
22. Aluminium liberates _ gas when it reacts with conc. H2SO4
SO2
23. The +1 oxidation state of which of these elements is the most stable?
Thallium
24. Boron burns with a _ flame when heated
Green
25. Which of these Boron compounds is almost as hard as diamond, used in bulletproof vests and as an abrasive?
Boron carbide
26. Boron oxide acts as...
Lewis acid
27. Despite the toxicity of group 3A elements, one is an important plant nutrient, which is...
Boron
28. Pyrex is a type of _ glass
Borosilicate glass
29. Aluminium burns with a _ flame when heated?
None
30. Gallium usually exists as...
Ga2
