Chemistry Paper 12 and 22!

[Farhan Saeed]

There is this question about which element is in excess. I just did all the working correctly, but at the end, wrote that copper is in excess (Silly I know). The question was of 3 marks. My whole working shows that iron is in excess. How much will it be marked?

 

[hassan50306]

well i guess you'll be able to score 2 out of 3 cuz atleast you did the working which showed that iron was in excess

 

[Saad Hassan]

There is this question about which element is in excess. I just did all the working correctly, but at the end, wrote that copper is in excess (Silly I know). The question was of 3 marks. My whole working shows that iron is in excess. How much will it be marked?

1 mark is for calculating Mr 2nd for number of moles and stating that there is 1:1 third for stating...

 

[Saad Hassan]

what were two ions and gas z liberated on decomposition of Ammonium Vanadate??

 

[Muaztsu]

N+ ans H+

what were two ions and gas z liberated on decomposition of Ammonium Vanadate??

 

[Muaztsu]

ammonia gas

N+ ans H+

 

[hassan50306]

ammonia gas

N+ ions?
i guess they dont even exist xD

 

[Farhan Saeed]

NH3 is the covalent compound. Theres no ions in it. Btw I don't see anyother option there so I wrote N+3 and H-1.

 

[Saad Hassan]

i wrote NH4 1+ and VO3- and nitrogen dioxide i dont think tha N+ ion or H+ ions were in the compound ammonia was released on heating but without adding aluminium foil so cation was NH4 1+

 

[Muaztsu]

oye hoyeeeeeee

 

[Ammarfasih]

N+ ans H+

it was NH4 and VO3

 

[Saad Hassan]

it was NH4 and VO3

i wrote the same but dont you think there must be some anion in it

 

[fjmskt]

.144g of Al compound X reacts with an excess of water, to produce a gas. This gas burns in O2 to form H2O and 72cm3 of CO2 only. The volume of CO2 was measured at room temp & pressure.
what could be the formula of X?
[C=12, Al=27; 1 mol of any gas occupies 24dm3 at room temp & pressure]