Biology; Chemistry; Physics: Post your doubts here!

[DaniyalK]

ANSWER IS A View attachment 43336

A is correct because they can be inorganic (e.g Iron) or organic ( e.g enzymes)
B is wrong because catalysts do take part in a reaction (but are unchanged at the end)
C is wrong because it can speed up both forward and backward
D is wrong because it does not provide the activation energy, only lowers it.

 

[kirann]

B

 

[FLRNAB]

What are the conditions which favor forward reaction in equilibrium and what are the conditions which favour backward reaction?

 

[DaniyalK]

B

View attachment 43339

Calcium sulfate is insoluble. To prepare an insoluble salt, both reactants must be soluble and that's only the case in B.

 

[DaniyalK]

What are the conditions which favor forward reaction in equilibrium and what are the conditions which favour backward reaction?

Temperature Increase: Forward in endothermic. Backward in exothermic.
Pressure: Increase will shift equilibrium towards less moles. Decrease will shift it towards more moles.
When you add more reactant or increase the conc. of reactants, it will move forward and opposite when you do the same for products.
When you remove a reactant, reaction will move backwards and when you remove a product, reaction will shift forwards.

 

[Uchiha-Sasuke]

What are the conditions which favor forward reaction in equilibrium and what are the conditions which favour backward reaction?

Pressure:
Count the total moles on reactant and on product side.
increasing pressure shifts it to lower mole side
and v.versa

Temp:
check whether endo or exo:
increase temp in ENDO shifts ro right .
and V.versa

Conc:
Increasing concentration of reactant (left) shifts to product (right)
and v.versa

B

View attachment 43339

in question like these for their reactions and (cross compound forming of salts) both reactants must be water soluble

 

[kirann]

Calcium sulfate is insoluble. To prepare an insoluble salt, both reactants must be soluble and that's only the case in B.

and to prepare a soluble salt?

 

[DaniyalK]

and to prepare a soluble salt?

You do one of the four reactions:
1) Metal + acid
2) Metal oxide + acid
3) Metal carbonate + acid
4) Metal hydroxide + acid (titration)
depending on the salt you want.

 

[kirann]

A

 

[kirann]

Calcium sulfate is insoluble. To prepare an insoluble salt, both reactants must be soluble and that's only the case in B.

this is precipitation right?

 

[FLRNAB]

AView attachment 43342

Aluminium is extracted by electrolysis so it is most reactive.
Iron is extracted by reducing with coke (Carbon) so it is least reactive.
Carbon comes in between.

 

[DaniyalK]

AView attachment 43342

This is just a recall question regarding reactivity series. Or you can get the answer from the fact that iron is reduced by carbon while aluminium is not.

this is precipitation right?

Yeah.

 

[peacce]

mujhe kal ka bohot dar lagrahaaaaaaaaaaaa haaaaaaaaaaaaai

 

[spacemaster960]

what was the voltage in physics last question(theory)??
and also question's b part and its answer??
and does anyone remember the 4 mcq??
also what was the conductor and insulator??

 

[Ram97]

mujhe kal ka bohot dar lagrahaaaaaaaaaaaa haaaaaaaaaaaaai

Dar kay aagay jeet hai

 

[peacce]

Dar kay aagay jeet hai

HOpefUlly -_-

 

[Ram97]

what was the voltage in physics last question(theory)??
and also question's b part and its answer??
and does anyone remember the 4 mcq??
also what was the conductor and insulator??

Conductor: Aluminium Insulator:Rubber
What was the 4th mcq??

 

[spacemaster960]

why not copper conductor??
and idk remember that's why i am asking

 

[Ram97]

why not copper conductor??
and idk remember that's why i am asking

cuz it said aluminium as an insulator with copper so it was wrong

 

[spacemaster960]

oh