- Messages
- 83
- Reaction score
- 114
- Points
- 43
Q3. we add the first and second ionisation energies of Al: 1820 + 577 = 2397 kJ/molI also have these questions as doubts-
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Thank you!!!
now we add the the ionisation energies of each element given and the one that add up to 2397 will be our answer!
so when we add the 1st and 2nd ionisation energy of Co we get: 1640 + 757 = 2397 kJ/mol so our ans is A
Q4. in this one we have to find the one that DOES NOT HAVE 126 NEUTRONS!
they have give us the total nucleon number so when looking at the periodic table, only take the proton number of the element!
Bi = 209 - 83 = 126
Pb = 208 - 82 = 126
Po = 210 - 84 = 126
Tl = 208 - 81 = 127
so D= T l will be our ans as it does not have the magic no. 126 nucleon!
Q7. im not sure about this one but i do know that since Phosphorus is in group 5 it will form bonding like ammonia and will have the bond angle of 107
since they havent given us 107 in our answer we have to chose and answer close to 107! so logically speacking 109 is closer to 107 but wa cant have that as the answer! out angle should be smaller them or equal to 107 so the next closest no. is 104, thus the answer 104!
Q18. again im not sure of this answer so please confirm this one with someone else!
hydrogen bond will be present! so our ans will narrow down to C and D!
since NH3 is basic it ionises the water and thus we will have ions in the solution!
thus our answer is D