Biology; Chemistry; Physics: Post your doubts here!

[princess Anu]

B, C.

That's just basic concepts of Chemistry Haven't you read that in the book?

It doesnt react with any metal.

 

[Dark Destination]

It doesnt react with any metal.

Oh, yeah the less reactive ones.
I have forgotten chemistry

 

[kirann]

d,c?

yeah

 

[princess Anu]

Ops! it's C

and the reason you told for 1 is also not correct as i suppose. :/
Zinc sulphate is a crystal already we just have to separate it from zinc powder for which we are adding water so that it forms Zin hydroxide and can be filtered off.

 

[kirann]

d,c?

its b,c
yeah maybe i did, i forget things very easily.

 

[FLRNAB]

A lot of people think that, the entire world thinks that.
But it's a different story for every person. Everyone has a different philosophy.

One can solve a million past papers, read a million books, but in the end what Allah wants will happen.
That just proves how we have no control of our lives. It's all up to Him.

All we can do is, Hope for the best. (Y)

But everyone has a different opinion. xD

Meri kal wali baat aaj samaj aaye hai xD

 

[princess Anu]

Oh, yeah the less reactive ones.
I have forgotten chemistry

No you are right.
becaus Hcl is a oxidising acid so can react with any metal .
but why not d :S

 

[princess Anu]

Why cant Hcl react with ANY base to form salt?? :SSS

 

[Maganius]

4 (d) All acids react with a base to give a salt and a water.

5( b) I'm not sure about this though .

View attachment 41616
plz explain asap plz

 

[Dark Destination]

Meri kal wali baat aaj samaj aaye hai xD

What is HYDROCHLORIC ACID?

It's a solution of H+ ions and Chloride ions.

Now, the reactivity series. It has many metals above hydrogen, and many below it.
If you add one of the metals that are above hydrogen, it will react with HCL, and form a chloride.

If COPPER, or SILVER is added, it won't react, as it is below HYDROGEN and can't displace it from its solution.

 

[kirann]

this one as welll........... :/

 

[Dark Destination]

Meri kal wali baat aaj samaj aaye hai xD

I already knew.

 

[princess Anu]

View attachment 41617
this one as welll........... :/

which year was that HCL question from?

 

[Maganius]

Why cant Hcl react with ANY base to form salt?? :SSS

Acis react with bases to produce salt + water.

 

[princess Anu]

View attachment 41617
this one as welll........... :/

A

 

[princess Anu]

Acis react with bases to produce salt + water.

I know that. But Im asking Why was D not the answer to that Question.

 

[kirann]

4 (d) All acids react with a base to give a salt and a water.

5( b) I'm not sure about this though .

y not 4(b) ?

 

[FLRNAB]

View attachment 41617
this one as welll........... :/

A
B - Carbonate + Acid --> COz like in beverage
C - Metal + Acid --> Salt + Hydrogen
D - Alcohol + Acid = Ester

Deduction by cancellation. It asked for incorrect one.

 

[Dark Destination]

I know that. But Im asking Why was D not the answer to that Question.

It was.

 

[kirann]

A

dear i know its answer but i need someone to explain this .... y its A?