₦airaland Forum

Optimist1998:
Which of the following statements is correct about sodium chloride in the solid state?
A. it exists as aggregates of ions
B. it conducts electricity
C. its melting point is below 100oC
D. it exists as discrete molecules
E. its ions are linked by metallic bonds

Which of the following reactions is not feasible?
A. Cl2 + 2Kl → 2KCI + I2
B. Cl2 + 2NaF → 2NaCI + F2
C. Zn + CuCI2 ZnCl2 + Cu
D. Zn + 2AgNO3 → Zn(NO3)2 + 2Ag

The second should be B. No way on earth chlorine displace flourine
I need time for d first one

Optimist1998:
I don't think any school is innocent in Nigeria, it happens everywhere but 300 and still no admission....talk about corruption

Oya enough talk... Post questions here let me flex my head

Optimist1998:
Hehe why the hate?

are they not d one dat deny a guy with over 300 admission last year.... besides dat I know a guy who has been denied admission twice but still goes ahead and choose d place again.. who does dat?

Optimist1998:
I was in love with the school...

good for u it is 'was'

Optimist1998:
UI

crappy sch.... never really liked dat place

Optimist1998:
282

cool..... wat school

Optimist1998:
340 all things being equal

just curious.... wat did u score last yr

Optimist1998:
340 all things being equal

just curiou.... wat did u score last yr

Optimist1998:
UNN but it's still likely to change after jamb..
Depends on my performance.

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What are u aiming for as in what score.... I saw a certain score in my dream(lol) and have been obsessing about it since then

Am confused here
A blue solid,T which weighed 5.0g was placed on a table. After 8 hrs, the resulting pink solid was found to weigh 5.5g. It can be inferred dat substance T
A) is deliauescent B) is hygroscopic C)efflorescent
Last opt is nt important

Optimist1998:
C- K2SO4 Lilac flame = K cation White ppt with BaCL2 = SO4 anion

Correct

Optimist1998:
What happens when you pass CO2 into lime water?
You get a white ppt CaCO3
If you keep passing CO2 (excess) the milkiness dissappears due to the formation of CaHCO3.

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If u keep passing it into NaoH I think u are ryt.... But if u pass a certain amount and leave it in d sol den am ryt

Which of the ffg would give lilac flame colouration and a white precipitate with acidified barium chloride solution.
A)kcl B)NaNo3 C)K2So4 D)Caso4

Optimist1998:
Lol
I thought of B at first but then ===>SO2 "for a long time" (that's in excess) it should give an acidic salt.

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Past question chose B but I'm rooting for C

. I don't get.... Does for a 'long period of time' means so2 is in excess.... I think it means d final product.
Let me give u an example.... Like uhmm ethanol is passed into k2cr2o7 for a long period of time... Does dat means ethanol is in excess.. I don't think so

Optimist1998:
Phyiscs:
The time rate of change of momentum is
A. impulse
B. force
C. power
D. pressure

A force of 100N was used to kick a football of mass 0.8kg. Find the velocity with which the ball moves if it takes 0.8s to be kicked
A. 32ms¹
B. 10ms²
C. 64ms¹
D. 100ms¹

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First should be B I think...... F=mv-mu/t.
Time rate of change of momentum

Optimist1998:
Don't get it twisted; 1dm3 of 0.5 is thesame thing as 0.5Molar solution. Formula for molar solution M= n/V 0.5=n/1 n=0.5

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0.5M is simply 0.5 moles in 1000cm3 or 1dm3 solution.

. Maybe I shld modify this U said no of moles of H+. I.E H2S04>>>> 2H+ + SO4^2. n=0.5x2(2 mole of H+)= 1

This barca I support eh... Hmm

Optimist1998:
Chemistry:
««When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of
A. NaHSO4
B. Na2SO3
C. NaHSO3
D. Na2SO4
««What will happen if an aluminium spoon is used to stir a solution of iron (II) trioxonitrates (V)?
A. The spoon will be oxidized while the iron (II) ions will be reduced to the metal
B. The spoon will increase in size
C. The spoon will be reduced while the iron (II) ions will be oxidized
D. The spoon will be reduced
««In the purification of impure samples of ethyl ethanoate synthesized by esterification, concentrated sodium trioxocarbonate (IV) solution is used to remove
A. water
B. basic impurities
C. acidic impurities
D. ethoxyethane

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First one is a bit tricky but should be B.....
second one is should be A and d last one is certainly C.
So2+2NaOH>>>>>>Na2so3 + H2O

Optimist1998:
Don't get it twisted; 1dm3 of 0.5 is thesame thing as 0.5Molar solution. Formula for molar solution M= n/V 0.5=n/1 n=0.5

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0.5M is simply 0.5 moles in 1000cm3 or 1dm3 solution.

. Am not convinced yet but I will let it slide

IemFava:
dunno the first,recheck the second n d third is D

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I think d last is B 2 pairs

IemFava:
dunno the first,recheck the second n d third is D

The first one is C
2C2H5OH + 2Na >>>> 2C2H5ONA + H2.
H2 is d colourless gas

Optimist1998:
How many moles of [H+] are there in 1dm3 of 0.5 solution of H2SO4
A. 2.0mole
B. 1.0mole
C. 0.5mole
D. 0.2mole
Which of the following substances is not a homogeneous mixture?
A. Filtered sea water
B. Soft drink
C. Flood water
D. Writing ink

According to the kinetic theory an absence in temperature causes the kinetic energy of particles to
A. decrease
B. increase
C. remain constant
D. be zero

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Sol=mass/molar mass x 1000/vol
2H+= 0.5x2=1
1=n x 1dm3/1dm3= 1 ans should be B
Second one C.... Third one should be D

castrokiller:
check your options again and modify

Ha... Thank you I meant C... Dats always happen all d time... Have one ans in mind choose another..*sighs*

vikkeee:
what optical instrument can best be constructed with converging lenses of focal length 50cm and 5cm
a. compound telescope. b. terrestrial telescope. c. astronomical telescope. d. Galileo telescope

ans B.... Reason astronomical always have big objective lens focal length and small focal length for eyepiece

[quote author=Optimist1998 post=55315261][b]Chemistry

Group I elements are relatively soft due to their
A. Strong metallic bond
B. Strong covalent bond
C. Weak metallic bond
D. Weak vander waals force
E. Weak metallic bond
Ans should be E... Reason: they have only one free electron available for d bond

Optimist1998:
Chemistry
The equation PaVbTc= constant reduces to Charles Law if
A. a=1, b=1and c=0
B. a=1, b=0 and c=-1
C. a=0, b=1 and c=1
D. a=0, b=1 and c=-1

Physics
https://myschool.com.ng/classroom/photos/lthumbs/13127795721_19920002.jpg
In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
A. m1/m2
B. m1g/m2
C. m2/m1
D. m2g/m1

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The first one is D V/T=constant. The second is suppose to be D am not sure pls confirm and don't ask me to explain

Nuel25846:
why don't u open shop and do chemist like every other person??

I think doin dat with a certificate Is what separates us frm CHEMIST....

Nuel25846:
who has finished reading the novel(In dependence)??

I have.... I find d dates strange

Optimist1998:
Same here Which university did you pick

OOU pharmacy

Optimist1998:
Same here Which university did you pick

OOU

Optimist1998:
Med & surg
As for school, I haven't decided yet......more of unijos, maybe unn or even Delsu.

Haba!!! see whining @ your last statement
Thanks for the compliment........

Nice..... Hope we meet one day....... I would love to share ideas with someone like you