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Biology; Chemistry; Physics: Post your doubts here!

jj1234

jj1234

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Bhaijan said:
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
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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..:)
 
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Gohar Awais

Gohar Awais

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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

jj1234

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Gohar Awais said:
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?
Click to expand...
CaO because if we use CaCO3 carbondioxide gas will be broduced...:)
 
Metanoia

Metanoia

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Gohar Awais said:
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?
Click to expand...
jj1234 said:
CaO because if we use CaCO3 carbondioxide gas will be broduced...:)
Click to expand...

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.
 
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