Prince adebayo: CHEMISTRY
1.Which of the following gases dissolve in water vapour to produce acid rain during rainfall
A.oxygen
B.carbon(ii)oxide
C.nitrogen
D.sulphur(iv)oxide
2.Which of the following substances is not a homogenous mixture?
A.filtered sea water
B.soft drink
C.flood water
D.writing ink
3.The nucleus of the isotope tritium contains
A.two neutrons with no protons
B.one neutron and one proton
C.two neutrons and one proton
D.two neutrons,one proton and one electron.
4.Which of these is an acid salt?
A.K2SO4Al2(SO4)3.24H20
B.CuCO3,Cu(OH)2
C.NaHS
D.CaOCl2
5.Alkanals can be differentiated from alkanones by reaction with
A.2,4 dinitrophynythydrazine
B.hydrogen cyanide
C.sodium hydrogen sulphite
D.tollen's reagent
6.The carbon atoms in ethene are
A.sp3 hybridized
B.sp hybridized
C.sp2 hybridized
D.not hybridized
7.Duralumin consist of aluminium,copper
A.zinc and gold
B.lead and manganese
C.nickel and silver
D.manganese and magnesium
8.Which of the following is not used as a raw material in solvay process
A.ammonia
B.sodium chloride
C.calcium trioxocarbonate(iv)
D.sodium trioxocarbonate(iv)
9.which of the following gases will rekindle a brightly glowing splint?
A.NO2
B.NO
C.N2O
D.Cl2
10.The major component of the slag from the production of iron is
A.an alloy of calcium and iron
B.coke
C.impure iron
D.calcium trioxosilicate(iv)
GOODLUCK!!!

1 D
2 D
3 D
4 C
5 C
6 A
7 D
8 A
9 C
10 C

Mcslize:
1 D
2 D
3 D
4 C
5 C
6 A
7 D
8 A
9 C
10 C

i hav already written d answers o,ar u a medical aspirant?

A rectangle,8cm by 6cm is covered by a frame 1/2cm wide. What is the area of the frame?

20cm

Daviyd: A rectangle,8cm by 5cm is covered by a frame 1/2cm wide. What is the area of the frame?

20cm

Kendzyma: 20cm

show all working

A substance has a half life of 3min. After 6min,the count rate was observed to be 600. What is its count rate at zero time?

Daviyd: A substance has a half life of 3min. After 6min,the count rate was observed to be 600. What is its count rate at zero time?

2400

Daviyd: A substance has a half life of 3min. After 6min,the count rate was observed to be 600. What is its count rate at zero time?

sinc da half life is 3m..it means alf of d atom will decompos every 3m..so in six minut..it remains 600..dat means in 3 minute..it was 1200....so in 0 minute.. It will b 2400

Daviyd: show all working

xinc d fram is half d width of da rectangle...dats 8/2...sinc area is l*b...so we av 4*5...=20

Kendzyma: sinc da half life is 3m..it means alf of d atom will decompos every 3m..so in six minut..it remains 600..dat means in 3 minute..it was 1200....so in 0 minute.. It will b 2400

Kendzyma: sinc da half life is 3m..it means alf of d atom will decompos every 3m..so in six minut..it remains 600..dat means in 3 minute..it was 1200....so in 0 minute.. It will b 2400

Thanks

Kendzyma: xinc d fram is half d width of da rectangle...dats 8/2...sinc area is l*b...so we av 4*5...=20

i modified the post. Check the question again. Thankr

Kendzyma: xinc d fram is half d width of da rectangle...dats 8/2...sinc area is l*b...so we av 4*5...=20

i modified the post. Check the question again. Thanks

I have missed a lot!

I dnt knw if any of u guys were able to see my last post b4 it was hiden, d best thing Nairaland moderatos could do was 2 suspend me claiming it was a spam. Never the less, am still gona re-post it and wait 4 dia worst.

Pls Vote for one of ur own.
Vote OBINNAU
https://www.nairaland.com/1320228/mr-nairaland-june-2013-elimination/1

I've got a question;
The property which makes alcohol soluble in water is (a) hydrogen bonding (b)boiling point.

I chose hydrogen bonding but they chose boiling point.

Also,
Farmlands affected by crude oil spillage can b decontaminated by (a) using aerobic bacteria (b) burning off d oil frm d area (c) adding acidic solutions

Samuel pls go and vote for me.

Samueldona: Also,
Farmlands affected by crude oil spillage can b decontaminated by (a) using aerobic bacteria (b) burning off d oil frm d area (c) adding acidic solutions

a

Samueldona: I've got a question;
The property which makes alcohol soluble in water is (a) hydrogen bonding (b)boiling point.

I chose hydrogen bonding but they chose boiling point.

A

Just for clarification, i nid 2 know if i'm right;
1) Ca(OH)2 is used 2 test 4 CO2
2) NaOH is used 2 absorb CO2
Am I right?

Samueldona: Just for clarification, i nid 2 know if i'm right;
1) Ca(OH)2 is used 2 test 4 CO2
2) NaOH is used 2 absorb CO2
Am I right?

yap

Thanks. Those two av bin confusing me esp when i see both as options. Now, dats clear.

Samueldona: Thanks. Those two av bin confusing me esp when i see both as options. Now, dats clear.

dats fyn,i hope jacking is going smoothly?

Prince adebayo: dats fyn,i hope jacking is going smoothly?

yes, we tank God.

Hi everyone, i've got a question.
Which is considered 2 be d 1st product of photosynthesis? (a) Hydroxyl ions (b) starch
On a normal day, i'll choose starch which is what they chose. But, going by the chemistry of photosynthesis, d chlorophyll absorb sunlight which led 2 photolysis of water 2 yield H+ and OH-. So, y is d above not regarded as the 1st product of photosynthesis?
Awaiting your opinion.

Samueldona: Hi everyone, i've got a question.
Which is considered 2 be d 1st product of photosynthesis? (a) Hydroxyl ions (b) starch
On a normal day, i'll choose starch which is what they chose. But, going by the chemistry of photosynthesis, d chlorophyll absorb sunlight which led 2 photolysis of water 2 yield H+ and OH-. So, y is d above not regarded as the 1st product of photosynthesis?
Awaiting your opinion.

starch is d answer coz hydroxyl ion is nt stable coz it later gives oxygen as by product and hydrogen usd in d dark phase,meaning hydroxyl ion is nt among d final products,d pdts ar glucose nd oxygen

Samueldona: Hi everyone, i've got a question.
Which is considered 2 be d 1st product of photosynthesis? (a) Hydroxyl ions (b) starch
On a normal day, i'll choose starch which is what they chose. But, going by the chemistry of photosynthesis, d chlorophyll absorb sunlight which led 2 photolysis of water 2 yield H+ and OH-. So, y is d above not regarded as the 1st product of photosynthesis?
Awaiting your opinion.

Photosynthesis consists of 2 stages.
1. PHOTOLYSIS OF WATER MOLECULES: it is d spliting of water dat yields d (H) and (OH) ions.
Note dat it futher reacts 2 yield water and Oxygen.
2. REDUCTION OF CARBON DIOXIDE MOL: this is brought about by d hydrogen components produced by d photolysis of water mol.
This 2 stages makes up d chemistry of photosynthesis which yields starch and oxygen.

Who can tell me the first step in photosynthesis and with little explanation of it if u like?

Prince adebayo: Who can tell me the first step in photosynthesis and with little explanation of it if u like?

Read chelcy's post

Kolade9:
Read chelcy's post

there is a step b4 photolysis of water