Chemistry: Post your doubts here!

[princess Anu]

It will not necessarily have structural isomers.

How? If I use Ch3CHFCl lets say, I can make structural isomers like Ch2FCh2Cl ?

 

[Mathemagical]

The answer is B.
When heated strongly, both carbonates will decompose into their respective oxides and carbon dioxide.

Option 1: Magnesium oxide is a well-known refractory material. This is correct.
Option 2: Both oxides are basic, so they will react with acidic impurities. This is correct.
Option 3: Metallic oxides do not react with each other in redox reactions. The cations present are Ca2+ and Mg2+. To reduce others these cations must get oxidised. There are no such cations asCa3+ or Ca4+, so these cations cannot be oxidised. This is incorrect.

Therefore, the answer is B.

 

[Mathemagical]

How? If I use Ch3CHFCl lets say, I can make structural isomers like Ch2FCh2Cl ?

That is true, but that is not always the case. Take, for example, CFClBr. This molecule has 4 different groups on a single carbon but no structural isomers.

 

[Metanoia]

But removing H atom at the blue dot gives us option C too ;/ How do we know which C ( red Or blue) shud lose H?

Nope. Removing from blue dot gives us this.

 

[nehaoscar]

How to do this?

 

[nehaoscar]

I know that the answer is A
But i was wondering what would the product of this reaction in C be??

 

[nehaoscar]

Why is 3 wrong?

 

[nehaoscar]

Why would the rate decrease after some time (C)??

 

[Mathemagical]

View attachment 54546
I know that the answer is A
But i was wondering what would the product of this reaction in C be??

C is an ester. It will not react with HCN.

 

[qwertypoiu]

View attachment 54548
Why would the rate decrease after some time (C)??

How else would the reaction stop?

 

[shazmina]

View attachment 54547
Why is 3 wrong?

3 is a neutral salt but it doesnt make the water neutral....
inorder to make the acidic water neutral a basic substance have to be added to neutralise it .. therefore only 1 and 2 are right

 

[qwertypoiu]

View attachment 54547
Why is 3 wrong?

The first two options will neutralize the acid. How will potassium nitrate, a salt, react with the acid? It wouldn't.

 

[Mathemagical]

View attachment 54548
Why would the rate decrease after some time (C)??

The reactants will be used up and the rate decreases.

 

[qwertypoiu]

View attachment 54545
How to do this?

PV = nRT
R and T are constant. So we can write:
PV = kn, where k is just a constant.
n = PV/k
Moles of gas in flask X = 2*1/k = 2/k
Moles of gas in flask Y = 1*2/k = 2/k
Total moles = 4/k
New volume together = 1+2=3
New pressure = kn/V = k * (4/k) / 3 = 4/3Pa

 

[nehaoscar]

I thought D... but it's C
Can someone summarize the 2 reactions with equations please?

 

[nehaoscar]

How is 3 also correct?
V3+ = 20 electrons = 1s2 2s2 2p6 3s2 3p6 4s2 ... so it doesn't have unpaired electrons :/

 

[nehaoscar]

How else would the reaction stop?

But the products are catalysing the reaction... so why would it need to stop?
example : A + B = C
C keeps on catalysing the reaction A + B right?

 

[Metanoia]

why is it A ?:s why are other options wrong?

 

[qwertypoiu]

But the products are catalysing the reaction... so why would it need to stop?
example : A + B = C
C keeps on catalysing the reaction A + B right?

But A and B will run out at some point

 

[Mathemagical]

View attachment 54550
I thought D... but it's C
Can someone summarize the 2 reactions with equations please?

SO2 + Ca(OH)2 ---> CaSO3 + H2O