Biology; Chemistry; Physics: Post your doubts here!

[Bhaijan]

The question 5054_w11_qp_11, the answer is C.

 

[Bhaijan]

The question is from 5054_w09_qp_1, the answer is A.

 

[jj1234]

A question from Physics that's confusing.
The answer is C, but I am confused between the two choices C and D. Of course there is a concept involved here which at this point I haven't fully grasped
View attachment 46332

Q(11) ans is C because density of mercury is higher...so if the density is higher height will decrease.check if it is confusing by making h subject of the formula h=P/pgh..^_^
Q(10) ans is B cax we've to take the height f the liquid column above the liquid surface..

 

[Gohar Awais]

Can someone answer this
A farmer has used an ammonium fertiliser e.g. (NH4)2SO4 and his soil is acidic and the farmer has a choice to use calcium oxide (CaO) or calcium carbonate (CaCO3) to reduce the acidity.
Which choice is better and why is the other choice not suitable?

 

[jj1234]

Can someone answer this
A farmer has used an ammonium fertiliser e.g. (NH4)2SO4 and his soil is acidic and the farmer has a choice to use calcium oxide (CaO) or calcium carbonate (CaCO3) to reduce the acidity.
Which choice is better and why is the other choice not suitable?

CaO because if we use CaCO3 carbondioxide gas will be broduced...

 

[Metanoia]

Can someone answer this
A farmer has used an ammonium fertiliser e.g. (NH4)2SO4 and his soil is acidic and the farmer has a choice to use calcium oxide (CaO) or calcium carbonate (CaCO3) to reduce the acidity.
Which choice is better and why is the other choice not suitable?

CaO because if we use CaCO3 carbondioxide gas will be broduced...

Actually, I would disagree.

CaO would react with the ammonium fertilizer

base + ammonium salt --> salt + water + NH3
The above equation is the concept being tested in this question

So using CaO would result in nitrogen nutrient being lost in the form of NH3.

It is thus better to use CaCO3. There would be CO2 released, which isn't a problem as it simply means the acidity in the soil is being neutralized.

 

[Metanoia]

NH3 gas'll b produced if CaOH is used nt CaO ^-^ ....

Both Ca(OH)2 and CaO are bases. They will react with ammonium salt to produce NH3

CaO + (NH4)2SO4 --> CaSO4 + H2O + 2NH3

Ca(OH)2 + (NH4)2SO4 --> CaSO4 + 2H2O + 2NH3

 

[jj1234]

Both Ca(OH)2 and CaO are bases. They will react with ammonium salt to produce NH3

CaO + (NH4)2SO4 --> CaSO4 + H2O + 2NH3

Ca(OH)2 + (NH4)2SO4 --> CaSO4 + 2H2O + 2NH3

Yh ur right..actually it was m ans, had t trust 1 of my teacher tho
Gohar Awais srryyy #wnt-happen-again

 

[♣♠ Magnanimous ♣♠]

The question 5054_w11_qp_11, the answer is C.
View attachment 47127

More cells and only one lamp so It will glow BRIGHTER and of course for long time
Thought blocker Am I right?

 

[jj1234]

More cells and only one lamp so It will glow BRIGHTER and of course for long time
Thought blocker Am I right?

correct also they r in parallel

 

[jj1234]

The question is from 5054_w09_qp_1, the answer is A.
View attachment 47128

because evaporation depends on surface area nt depth as surface decreases evaporation decreases

 

[♣♠ Magnanimous ♣♠]

correct also they r in parallel

Hmm!

 

[Thought blocker]

More cells and only one lamp so It will glow BRIGHTER and of course for long time
Thought blocker Am I right?

Should I introduce a new concept to you guys of A level here? xD

 

[Thought blocker]

because evaporation depends on surface area nt depth as surface decreases evaporation decreases

 

[♣♠ Magnanimous ♣♠]

Should I introduce a new concept to you guys of A level here? xD

Kehdo

 

[Thought blocker]

Kehdo

Dar jayega baka..

 

[♣♠ Magnanimous ♣♠]

Waise wo hai kya?
Muje bhi nahi pata

Dar jayega baka..

 

[Thought blocker]

Waise wo hai kya?
Muje bhi nahi pata

Parallel wala

 

[♣♠ Magnanimous ♣♠]

Parallel wala

You are late
jj1234 told that

 

[Thought blocker]

You are late
jj1234 told that

Okay, so what happens if cell are parallel tell me. :/