Biology; Chemistry; Physics: Post your doubts here!

[MustafaMotani]

WHY DOES THE QUESTION SAYS THAT THE REACTION DOES NOT TAKE PLACE AT ROOM TEMP

Because it has protective coating around it
I beleive

 

[snowbrood]

They depend upon element's Electronic Configuration!

U ARE WRONG CHEMICAL PROPERTIES DEPEND UPON ELECTRONIC CONFIG

 

[MustafaMotani]

WHY DOES THE QUESTION SAYS THAT THE REACTION DOES NOT TAKE PLACE AT ROOM TEMP

which year mcq.. ??

 

[Dukeofwin]

27a and 12c. duke displacement reaction requires no heat you know.

Yeah! Thanks!
Wasn't sure thats why kept it to a guess!

 

[Dukeofwin]

U ARE WRONG CHEMICAL PROPERTIES DEPEND UPON ELECTRONIC CONFIG

I read it on a website!
http://www.citycollegiate.com/periodictableIX.htm

 

[MustafaMotani]

its 27 a I confirmed from google

 

[snowbrood]

which year mcq.. ??

J10 P12

 

[Dukeofwin]

I

Because it has protective coating around it
I beleive

Its exhothermic, as told by A star

 

[MustafaMotani]

chemical properties is largely influenced by electronic configuration

 

[MustafaMotani]

I
Its exhothermic, as told by A star

really??

 

[MustafaMotani]

I
Its exhothermic, as told by A star

Its A I checked in the marking scheme ..

 

[Dukeofwin]

really??

Beg your pardon!
A star said its A

27a and 12c. duke displacement reaction requires no heat you know.

 

[malay]

Which equation describes the most suitable reaction for making lead sulphate?
A Pb + H2SO4 → PbSO4 + H2
B PbCO3 + H2SO4 → PbSO4 + CO2 + H2O
C Pb(NO3)2 + H2SO4 → PbSO4 + 2HNO3
D Pb(OH)2 + H2SO4 → PbSO4 + 2H2O
ms says its C buh why not D??

 

[SilverCrest]

Which equation describes the most suitable reaction for making lead sulphate?
A Pb + H2SO4 → PbSO4 + H2
B PbCO3 + H2SO4 → PbSO4 + CO2 + H2O
C Pb(NO3)2 + H2SO4 → PbSO4 + 2HNO3
D Pb(OH)2 + H2SO4 → PbSO4 + 2H2O
ms says its C buh why not D??

lead sulphate is an insoluble salt
so it has to be prepared by ionic precipitation of soluble salts
in D Lead hydroxide is insoluble(only Group 1 and 2 Metal Hydroxides are soluble)

 

[ISFSAT]

View attachment 11038View attachment 11039

27. A
12. C

 

[malay]

lead sulphate is an insoluble salt
so it has to be prepared by ionic precipitation of soluble salts
in D Lead hydroxide is insoluble(only Group 1 and 2 Metal Hydroxides are soluble)

thankyou...

 

[Dukeofwin]

Reactivity series !
Please (K) send (Na) cats (Ca) monkeys (Mg) and (Al) Zebras (Zn) In (Fe) large (Pb) huge (H) cage (Cu) . Make (Hg) sure(Ag) packed/padlocked (Pt)

Hope it helps, it did help me

Appreciated , but you are a bit too late brother!
4-5 Mnemonics have already been shared while Chemistry ATP was discussed!
P.S this one was included in that too!

 

[A star]

Appreciated , but you are a bit too late brother!
4-5 Mnemonics have already been shared while Chemistry ATP was discussed!
P.S this one was included in that too!

it was done by me

 

[kitecrystal]

why KNO3 can not be chosen as a reagent for preparing potassium chloride salt?

 

[Dukeofwin]

it was done by me

You mean, you made that mnemonic?