Qualification > Queries

ANY DOUBTS HERE!!!

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sweetie:
hey,
i need help in these que's plz :-\

Q3, 11 and 17

nid404:
3)Al---Al+   +577 1st IE
Al+--Al2+   +1820 2nd I.E

so Al---Al2+        +2397kj/mol

Co--Co+  +757
Co+--Co2+  +1640

so Co--Co2+   + 2397 kj/mol

So A

sweetie:
got it , Thank You  ;)

nid404:
11)
         2HI(g)<-----> H2(g) + I2(g)

initial     b                   0         0
final      b-x                 x          x

total no of moles= 4
pressure = p
*pp=partial pressure
Kp= ppI2 XppH2/ pHI2
ppI2 and H2= x/4 Xp  ( moles/total no of moles X total pressure)
ppHI= b-x/4 Xp

Kp= (xp/4)X (xp/4)
       -------------
          ((b-x)p/4)2
=___x_2__
   4(b – x)2
D

nid404:
15) C

when a compound has no charge...

u equate the ox states to 0
 A NH4Cl  NH4 has ox state of +1 so Cl will be -1   ruled out
 B NH4ClO3  +1 + (3x-2)[oxygen has state -2) + cl=0
                 Cl= +5   rule out
C NH4ClO4   +1 + (4X-2) + Cl=0
                  Cl=-7   here we got it :)

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