NewStats: 3,264,681 , 8,184,402 topics. Date: Thursday, 12 June 2025 at 01:28 AM 66c5i

I respect my seniors here.

abeylysis92:


yeah
you are right
it is flooding
as a result of constant climatic changes
noted boss

That is why we humans are infallible. We are all here to learn. It is better we make those mistakes now than in the exam hall.

Eben331:
That is why we humans are infallible. We are all here to learn. It is better we make those mistakes now than in the exam hall.

yeah boss! only God is perfect
can I have your Number, please?

1. Calculate the volume of hydrogen that would be liberated by dissolving 2.40g of calcium in water at 27C and 100kNm^2

Ca + 2H2O --- Ca(OH)2 + H2..

2. Iron is produced from its pretty according to the equation :

2Fe2O3 + 3CO --- 4Fe + 3CO2
Calculate the percentage yield, if 500 tonnes of the one produced 145 tonnes of iron..

3. Glycine, an amino acid, has one nitrogen atom per molecule. If the percentage by mass of Nitrogen in glycine is 18.7%. Calculate the relative molecular mass of the amino acid

4. Why is Hydrogen fluoride a liquid at room temperature, unlike hydrogen chloride

5. Orbitals with the same energy are called what?

6. When Cao is heated to a very high temperature, it emits a light termed?

7. All the following properties are true of solids Except
A. cannot be compressed
B. Does not evaporate
C. Has a definite weight
D. Has a definite shape
E. Has a definite volume

8. Calculate the volume of CO2 released when 30dm^3 of air was ed over an excess of red hot coke. (All gas volumes measured at the same temperature and pressure. Air is about 20% oxygen by volume)

9. What is the colour of bromothyl blue in acidic solution

10. What is the general formula of a double salt?

Post with solutions..

No guts no glory

Gracy3535:
A consequence of global warming is..........(a)air pollution (b)water pollution (c)increased humidity (d)flooding

The answer is D
large excess of CO2
in the atmosphere is responsible for global warming. Global warming causes flooding & high temp-related disease e.g cancer

Gracy3535:
A consequence of global warming is..........(a)air pollution (b)water pollution (c)increased humidity (d)flooding

Someone help has re-ing of O'level ended on Ui portal?

well done bosses in the house . You guys need to prepare for that exam. How was those chemistry questions I gave you. Chemistry was one of my best subject in schools those days.

Medical student I can see you are brainstorming seriously. My cousin wants to study biochemistry and he had 267 in jamb pls is he good to go with that score.

abeylysis92:

yeah you are right it is flooding as a result of constant climatic changes noted boss

ok

Argon is used in gas-filled electric bulbs because it : A.is light B.gives coloured light C.prolongs the life of the filament D.catalyzes the burning of the filament ??

abeylysis92:

yeah boss! only God is perfect can I have your Number, please?

pm me thru Nairaland.

abeylysis92:
Someone help has re-ing of O'level ended on Ui portal?

No. You can make changes since your biodata is still there.

Bigboy289:
Argon is used in gas-filled electric bulbs because it : A.is light B.gives coloured light C.prolongs the life of the filament D.catalyzes the burning of the filament ??

[C] It prolongs the life of the filament, since it is inert and it's not easily oxidized.. I think

abeylysis92:


[C] It prolongs the life of the filament, since it is inert and it's not easily oxidized.. I think

i also have the same thought

Have been hearing about ing, are w to on Jamb or ui site?

10.X2SO4.Y2(SO4)3
X=monovalent
Y=trivalent
8.20-100
x-30
100x=600
x=6dm³
7.A
6.limelight
5.Degenerate orbital
4.HF is a liquid at room temperature due to the presence of hydrogen bond.
3.18.7%=14/x *100
18.7x=1400
x=74.866~75g

TeflonBlixx:
1. Calculate the volume of hydrogen that would be liberated by dissolving 2.40g of calcium in water at 27C and 100kNm^2

Ca + 2H2O --- Ca(OH)2 + H2..

2. Iron is produced from its pretty according to the equation :

2Fe2O3 + 3CO --- 4Fe + 3CO2
Calculate the percentage yield, if 500 tonnes of the one produced 145 tonnes of iron..

3. Glycine, an amino acid, has one nitrogen atom per molecule. If the percentage by mass of Nitrogen in glycine is 18.7%. Calculate the relative molecular mass of the amino acid

4. Why is Hydrogen fluoride a liquid at room temperature, unlike hydrogen chloride

5. Orbitals with the same energy are called what?

6. When Cao is heated to a very high temperature, it emits a light termed?

7. All the following properties are true of solids Except
A. cannot be compressed
B. Does not evaporate
C. Has a definite weight
D. Has a definite shape
E. Has a definite volume

8. Calculate the volume of CO2 released when 30dm^3 of air was ed over an excess of red hot coke. (All gas volumes measured at the same temperature and pressure. Air is about 20% oxygen by volume)

9. What is the colour of bromothyl blue in acidic solution

10. What is the general formula of a double salt?

An object gives a real image, magnified four times at 120cm from the second principal focus. Find the focal length of the lens (a) 30cm (b) 40cm (c) 60cm (d) 80cm PLS SHOW UR WORKINGS!!

Eben331:
An object gives a real image, magnified four times at 120cm from the second principal focus. Find the focal length of the lens (a) 30cm (b) 40cm (c) 60cm (d) 80cm PLS SHOW UR WORKINGS!!

60cm.. If it's correct, I'll drop solution..

TeflonBlixx:


60cm.. If it's correct, I'll drop solution..

I dnt even knw the ans, I saw the question somewhere. Show ur solution. You maybe right.

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Eben331:
An object gives a real image, magnified four times at 120cm from the second principal focus. Find the focal length of the lens (a) 30cm (b) 40cm (c) 60cm (d) 80cm PLS SHOW UR WORKINGS!!

I got 60cm(c)...
for the image to be at 2F, that mean the object is also from d extreme 2F1.
therefore U equals V
1/v+1/u equals 1/F
I/120+1/120 equals 1/F
2/120 equals 1/F
therefore, F equals 120/2
which is 60cm
I think the magnification is just there to cause confusion or so
I'm open to correction, bosses in the house

Please I need the PDF of
chemistry past question for ui

odumzy:
Please I need the PDF of
chemistry past question for ui

that's it
click on it to it,ma

abeylysis92:


that's it
click on it to it,ma

Thanks

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abeylysis92:



I got 60cm(c)...
for the image to be at 2F, that mean the object is also from d extreme 2F1.
therefore U equals V
1/v+1/u equals 1/F
I/120+1/20 equals 1/F
2/120 equals 1/F
therefore, F equals 120/2
which is 60cm
I think the magnification is just there to cause confusion or so
I'm open to correction, bosses in the house

I don't really get this sir
where did you get 20 for object

abeylysis92:


that's it
click on it to it,ma

u sent me a mail?

Please bosses here...

What is the lens formula for a concave or diverging lens ? ...Two textbooks I have are saying different things and I am confused..