benjijosh:
Nobody to answer my question on page 196.

Re-post

Seunvense:
Kudos to HORPEYEMMI66,OGOJNR,MATHEFARO et al for keeping this thread alive.

You guys should check this out:
Of course, we all saw the culprit---and hit the man on the head
(a)approached (b)approaching (c)approach (d)approaches

Its been God jare @Oluwaseun...sorry I missed this.

Seunvense:
Kudos to HORPEYEMMI66,OGOJNR,MATHEFARO et al for keeping this thread alive.

You guys should check this out:
Of course, we all saw the culprit---and hit the man on the head
(a)approached (b)approaching (c)approach (d)approaches

Its been God jare @Oluwaseun...sorry I missed this.

cassyrooy:
biko! stop whyning us

Hahaha Cassy, wush kin level be that one now?

*CHEMISTRY | ELECTROLYSIS 001

1. If the cost of electricity required to deposit 1g of aluminium is N4.00, how much would it cost to deposit 24g of copper?[Al=27, Cu=64]

A. ₦27.02

B. ₦37.02

C. ₦47.02

D. ₦57.02

2. A current of 0.50A flows for 16mins 5seconds and deposits 0.163g of a metal X during the eletrolysis of an aqueous solution of a salt of the metal. What is the charge on the metal ion?

A. ±4

B. ±3

C. ±2

D. ±1

3. What volume of Oxygen measured at STP would be liberated by passing a current of 10A into a Hoffman's voltameter containing acidified water for 965 seconds?

A. 5.60 dm3

B. 0.560 dm3

C. 11.2 dm3

D. 1.12 dm3

4. What mass of bromine would be produced during the electrolysis of molten lead(II) bromide in which 10.35g of lead was deposited?[Pb=207, Br=80]

A. 4.00g

B. 7.00g

C. 4.50g

D. 8.00g

I intentionally added options cos there is a high proclivity for people to mix things up...ending up with weird answers.

Just smash that...

u sure knw dat i cn do nothing witout GOD...tenks

horpeyemmi66:
*CHEMISTRY | ELECTROLYSIS 001

1. If the cost of electricity required to deposit 1g of aluminium is N4.00, how much would it cost to deposit 24g of copper?[Al=27, Cu=64]

A. ₦27.02

B. ₦37.02

C. ₦47.02

D. ₦57.02

2. A current of 0.50A flows for 16mins 5seconds and deposits 0.163g of a metal X during the eletrolysis of an aqueous solution of a salt of the metal. What is the charge on the metal ion?

A. ±4

B. ±3

C. ±2

D. ±1

3. What volume of Oxygen measured at STP would be liberated by passing a current of 10A into a Hoffman's voltameter containing acidified water for 965 seconds?

A. 5.60 dm3

B. 0.560 dm3

C. 11.2 dm3

D. 1.12 dm3

4. What mass of bromine would be produced during the electrolysis of molten lead(II) bromide in which 10.35g of lead was deposited?[Pb=207, Br=80]

A. 4.00g

B. 7.00g

C. 4.50g

D. 8.00g

I intentionally added options cos there is a high proclivity for people to mix things up...ending up with weird answers.

Just smash that...

A B D D.

horpeyemmi66:
*CHEMISTRY | ELECTROLYSIS 001

1. If the cost of electricity required to deposit 1g of aluminium is N4.00, how much would it cost to deposit 24g of copper?[Al=27, Cu=64]

A. ₦27.02

B. ₦37.02

C. ₦47.02

D. ₦57.02

2. A current of 0.50A flows for 16mins 5seconds and deposits 0.163g of a metal X during the eletrolysis of an aqueous solution of a salt of the metal. What is the charge on the metal ion?

A. ±4

B. ±3

C. ±2

D. ±1

3. What volume of Oxygen measured at STP would be liberated by passing a current of 10A into a Hoffman's voltameter containing acidified water for 965 seconds?

A. 5.60 dm3

B. 0.560 dm3

C. 11.2 dm3

D. 1.12 dm3

4. What mass of bromine would be produced during the electrolysis of molten lead(II) bromide in which 10.35g of lead was deposited?[Pb=207, Br=80]

A. 4.00g

B. 7.00g

C. 4.50g

D. 8.00g

I intentionally added options cos there is a high proclivity for people to mix things up...ending up with weird answers.

Just smash that...

Thank God 4 d options
1.A
2.B
3.B
4.D (its D not B)
good afternoon bosses......

horpeyemmi66:
*CHEMISTRY | ELECTROLYSIS 001

1. If the cost of electricity required to deposit 1g of aluminium is N4.00, how much would it cost to deposit 24g of copper?[Al=27, Cu=64]

A. ₦27.02

B. ₦37.02

C. ₦47.02

D. ₦57.02

Answer is #27. See workings in the picture below. To busy to type

horpeyemmi66:


4. What mass of bromine would be produced during the electrolysis of molten lead(II) bromide in which 10.35g of lead was deposited?[Pb=207, Br=80]

A. 4.00g

B. 7.00g

C. 4.50g

D. 8.00g

mass of Br2 produced = 8.0g

.

A,C,B,D

3.2o2----->o2 + 4e-...oxygen wil lose 4 electron to become neutral. 4f=22.4 0.1f=x x=22.4*0.1/4 x=0.56dm

Win N10,000 & an immediate paid internship with @BudgITng . View details -> http:///1dj6MLY #CompeteToIntern

A,C,B,D

1. Al^3+ + 3e- ↔ Al
....1mol of Al → 3F
.....(1/27) mol of Al → (1/27 x 3F)

From Aluminium we can deduce that

.......F/9 → ₦4.00

For Copper

.....Cu^2+ + 2e- ↔ Cu
.....1 mol of Cu → 2F
.....(24/64) mol of Cu → 24/64 x 2F
.......................................... → 3F/4

So we can just use proportion,

...........F/9 → ₦4.00
...........3F/4 → (3F/F) / 9
.....................→ (3F x 9)/ F
....................→ 27g

when you use 96500c instead of F, then you will get 27.02g aproximately.

2. So so sorry, I never gave you the RMM of X, its 65, now try again.

3......Q = It
.........Q = 10 x 9650C
.........Q= 9650C

therefore,
......................4F → 22.4dm3
................9650 → 0. 56dm3

Odilop, sorry but it was not the right answer, I've got two similar questions before me, this and another, whose answer was what you got.

4. Pb2+ + 2e- ↔ Pb
.....1 mol of Pb → 2F
(10.35/207)mol of Pb →0.05 x 96500
.............................................→9650C

For Bromine

.....2Br- - 2e- ↔ Br2
.....1 mol of Br → 2F
.....X mol of Br ←9650C
.......X= 9650/2F
.......X= 0.05mol

but, mol = mass/ molar mass

0.05mol = M/ (80 x2)

M= 0.05 x 80 x 2 = 8.00g

------------------------------------------------

Sorry for any inconvieniences.

This was the question I thought I posted

If 6.4g of copper is deposited in a copper calorimeter connected in series with a Hoffman Voltameter, the volume of Oxygen liberated at stp is?

A. 0.112 dm3

B. 11.2 dm3

C. 1.12 dm3

D. 22.4dm3

FrancisTony:

Where did you extract the question from?
I saw it on Jamb series and chose "C" but when I checked the answer, it was "A".

Invisible Teacher exam year-2001 question 81.

waw,i got all ur questn completely for d 4st tym...i used my feeble experience for d no.2 because i got 1 bt wen i inserted it,z=32 bt wen i tried 2 i got z=65.2 so i knew it wuld be 2 which is copper.the ansa to ur questn is 1.12dm cube

horpeyemmi66:
1. Al^3+ + 3e- ↔ Al
....1mol of Al → 3F
.....(1/27) mol of Al → (1/27 x 3F)

From Aluminium we can deduce that

.......F/9 → ₦4.00

For Copper

.....Cu^2+ + 2e- ↔ Cu
.....1 mol of Cu → 2F
.....(24/64) mol of Cu → 24/64 x 2F
.......................................... → 3F/4

So we can just use proportion,

...........F/9 → ₦4.00
...........3F/4 → (3F/F) / 9
.....................→ (3F x 9)/ F
....................→ 27g

when you use 96500c instead of F, then you will get 27.02g aproximately.

2. So so sorry, I never gave you the RMM of X, its 65, now try again.

3......Q = It
.........Q = 10 x 9650C
.........Q= 9650C

therefore,
......................4F → 22.4dm3
................9650 → 0. 56dm3

Odilop, sorry but it was not the right answer, I've got two similar questions before me, this and another, whose answer was what you got.

4. Pb2+ + 2e- ↔ Pb
.....1 mol of Pb → 2F
(10.35/207)mol of Pb →0.05 x 96500
.............................................→9650C

For Bromine

.....2Br- - 2e- ↔ Br2
.....1 mol of Br → 2F
.....X mol of Br ←9650C
.......X= 9650/2F
.......X= 0.05mol

but, mol = mass/ molar mass

0.05mol = M/ (80 x2)

M= 0.05 x 80 x 2 = 8.00g

------------------------------------------------

Sorry for any inconvieniences.

This was the question I thought I posted

If 6.4g of copper is deposited in a copper calorimeter connected in series with a Hoffman Voltameter, the volume of Oxygen liberated at stp is?

A. 0.112 dm3

B. 11.2 dm3

C. 1.12 dm3

D. 22.4dm3

2. 1.9 aproxx 2.

4.11.2

cassyrooy:
Economics

1. The delibrate increase in the general level in an economy is

A - Inflation
B - Deflation
C - Activities of hoarders
D - Reinflation


2. One of the advantages of Regressive Form of taxation is

A - It encourages hard work
B - It reduces the volume of money in circulation
C - It reduces the purchasing power of the taxpayer
D - All of the above

3. Export Promotion Strategy means

A - Good produced are mainly for export
B - To improve the standard and quality of locally manufactured goods
C - To curb dumping from foreign nationals
D - To encourage industrialization and boost the quantity and quality of locally manufactured goods for both the home and foreign market.

4. Public Corporations are incompetent and inefficient because of

A - The lack of specialized managerial experts
B - The incompetence to probe corruption
C - Constant interferance by Government
D - The activities of trade union

5. The main reasons for the Localization of Industeries are except

A - Nearness to raw material
B - Availability of manpower
C - To reduce urban polution
D - Proximity to credit facility

AADAC

i tink it shud be 1.12dm cube
4rm cu2+ + 2e-=cu
2f=64
xf=6.4
x=6.4*2/64
x=0.2f
x=19300 bt oxy loses 4 electrns to become neutral
4f=22.4
0.2f=x
x=22.4*0.2/4
x=1.12dm cube (reveiwed questn ansa)

horpeyemmi66:
*CHEMISTRY | ELECTROLYSIS 001

2. A current of 0.50A flows for 16mins 5seconds and deposits 0.163g of a metal X during the eletrolysis of an aqueous solution of a salt of the metal. What is the charge on the metal ion?

A. ±4
B. ±3
C. ±2
D. ±1

I = 0.5A, t = (16*60)+5 = 965s, m = 0.163g, M = 65, n = ?
From the relation
MQ = nFm
n = MIt/Fm
Therefore n = (65*0.5*965)/(96500*0.163)
n = 1.99, approximately +2

horpeyemmi66:
*CHEMISTRY | ELECTROLYSIS 001


3. What volume of Oxygen measured at STP would be liberated by passing a current of 10A into a Hoffman's voltameter containing acidified water for 965 seconds?

A. 5.60 dm3

B. 0.560 dm3

C. 11.2 dm3

D. 1.12 dm3

1 mole of O2 = 4F = 22.4dm3
I.e 4*96500 = 22.4dm3
10*965 = x
x = 224*965/4*96500
x = 224/400
x = 56/100= 0.56dm3

good evening bosses.....

becborn:
good evening bosses.....

evening bossress

thaotech:


2. 1.9 aproxx 2.

4.11.2

Check no 4 @thaotech, it should be 1.12

I hail all of you, you are doing a great Job, not only the Sciences also the humanities.

Today has been eventful on NL/UIThread.

Got to catch some sweet sleep as it is drizzling...wishing myself a sweet dream.

Till tommorrow...

Keep the candles burning ever brightly.

Seunvense:
Kudos to HORPEYEMMI66,OGOJNR,MATHEFARO et al for keeping this thread alive.

You guys should check this out:
Of course, we all saw the culprit---and hit the man on the head
(a)approached (b)approaching (c)approach (d)approaches

Approached

cassyrooy:
Economics

1. The delibrate increase in the general level in an economy is

A - Inflation
B - Deflation
C - Activities of hoarders
D - Reinflation


2. One of the advantages of Regressive Form of taxation is

A - It encourages hard work
B - It reduces the volume of money in circulation
C - It reduces the purchasing power of the taxpayer
D - All of the above

3. Export Promotion Strategy means

A - Good produced are mainly for export
B - To improve the standard and quality of locally manufactured goods
C - To curb dumping from foreign nationals
D - To encourage industrialization and boost the quantity and quality of locally manufactured goods for both the home and foreign market.

4. Public Corporations are incompetent and inefficient because of

A - The lack of specialized managerial experts
B - The incompetence to probe corruption
C - Constant interferance by Government
D - The activities of trade union

5. The main reasons for the Localization of Industeries are except

A - Nearness to raw material
B - Availability of manpower
C - To reduce urban polution
D - Proximity to credit facility

A C D A C

ENGLISH QUESTIONS

Choose the correct answer
1. The pastor boasted that no power on earth can........ him a) expel b)exile c) excommunicate d)extract e)extradite

2. The kidnapper, pretending to be a madman only uses a....... to come unnoticed near innocent targets. a)subterfuge b)camouflage c)ambush d)shelter e)undercover

3. She had just gone out of the office...... the inspectors came. a)as b)before c)since d)when e)until

4. His suggestion is completely ....... the point and cannot be accepted. a)to b)about c)beside d)on e)under

5. He went up quickly and returned ....... a)fastest b)fastly c)as fastly d)as fast e) in fastness

cassyrooy:
Economics

1. The delibrate increase in the general level in an economy is

A - Inflation
B - Deflation
C - Activities of hoarders
D - Reinflation


2. One of the advantages of Regressive Form of taxation is

A - It encourages hard work
B - It reduces the volume of money in circulation
C - It reduces the purchasing power of the taxpayer
D - All of the above

3. Export Promotion Strategy means

A - Good produced are mainly for export
B - To improve the standard and quality of locally manufactured goods
C - To curb dumping from foreign nationals
D - To encourage industrialization and boost the quantity and quality of locally manufactured goods for both the home and foreign market.

4. Public Corporations are incompetent and inefficient because of

A - The lack of specialized managerial experts
B - The incompetence to probe corruption
C - Constant interferance by Government
D - The activities of trade union

5. The main reasons for the Localization of Industeries are except

A - Nearness to raw material
B - Availability of manpower
C - To reduce urban polution
D - Proximity to credit facility

Question 1 and 4 was set to see how alert you guys were, some passed but all failed number 1.

The 'delibrate' increase not 'persistent' or 'continous' increase... It would be easier if any word goes along increase is termed 'inflation'.

Reinflation is an economy tool mainly used by the government to achieve certain goals in an economy.

Advantages of Inflation are numerous but one states clearly that,

'it encourages investment'

In an economy where the investment rate continues to fall the government might create artificial inflation(Reinflate prices) through an extimated period of time so as to attract both local and foreign investors into the economy.


In Question 4, A and C were correct but you need to thoroughly scrutinize your options before choosing them.

A - The lack of specialize managerial expert wont hurt but you'll walk away with just a half mark. These guys were trained for these jobs why call them unqualified, unless someone in a superior place calls the shot by interferring even to who is employed or sacked.

These people will be feared and everyone will kow-tow to their will-the will of the adminstration in power.

KenyAyan:

Fixed

Sunmax01:
ENGLISH QUESTIONS

Choose the correct answer
1. The pastor boasted that no power on earth can........ him a) expel b)exile c) excommunicate d)extract e)extradite

2. The kidnapper, pretending to be a madman only uses a....... to come unnoticed near innocent targets. a)subterfuge b)camouflage c)ambush d)shelter e)undercover

3. She had just gone out of the office...... the inspectors came. a)as b)before c)since d)when e)until

4. His suggestion is completely ....... the point and cannot be accepted. a)to b)about c)beside d)on e)under

5. He went up quickly and returned ....... a)fastest b)fastly c)as fastly d)as fast e) in fastness

1. C, 2.B, 3.D, 4.C, 5.D

When is unibadan post utme coming out