How many structural isomers can be drawn for the non-cyclic alkanol with molecular formula C4H10O?

A. 1


B. 2


C. 3


D. 4



View Explanation

Question No:1022

An example of aromatic compound is?

A. C6H13OH


B. C6H13CI


C. C6H5OH


D. C6H14



View Explanation

Question No:1023

An example of aromatic compound is?

A. C6H13OH


B. C6H13CI


C. C6H5OH


D. C6H14



View Explanation

Question No:1024

Terylene is synthesized from ethane- 1, 2-diol and benzene - 1, 4-dicarboxylic acid by?

A. addition reaction


B. condensation reaction


C. elimination reaction


D. substitution reaction



View Explanation

Question No:1025

Which of the following is true concerning the properties of benzene and hexane?

A. Both undergo substitution reaction


B. Both undergo addition reaction


C. Both are solids


D. Both can decolourized bromine water

Osamuyipeace:
pls explain ur ansa to question 2

pressure =FORCE/AREA

but Boyles law =PV
i.e. force/area × volume
note. Area is m"2 while volume is m"3
cancel out the area it remains m
=force × meter
=force ×distance
force is in Newton while distance in Meter
ie Nm
but Nm= joule

joules is the unit of work or energy.


hope it's clear enough.

McHenry99:
When a yellow card is observed through a blue glass, the card would appear as a. black b. green c. red d. white e. Purple


The product PV Where P is pressure and V is volumes has. the same unit as
a. Force b. power c. energy d. acceleration e. none of the above.


A household refrigerator is rated 200Watts. if electricity costs 5K per KWh what is the cost of operating it for 20days?
a. N4.80 B. N48.00 C. N480.00 D. N4800.00 E. N240.00

A
C
A(REMEMBER TO CONVERT TO NAIRA
(the first question explanation)
Yellow is a secondary colour...which is made of red and green...since blue is not in its components...It will absorb the blue and reflect no colour. Ie the card will appear black.)

Osamuyipeace:
AEC

1/3

Pukka36:
ACC

2/3

Princecalm:
B B C

1/3

RobinHez:

1. green
2. C
3. C

1/3

When a yellow card is observed through a blue glass, the card would appear as a. black b. green c. red d. white e. Purple


The product PV Where P is pressure and V is volumes has. the same unit as
a. Force b. power c. energy d. acceleration e. none of the above.


A household refrigerator is rated 200Watts. if electricity costs 5K per KWh what is the cost of operating it for 20days?
a. N4.80 B. N48.00 C. N480.00 D. N4800.00 E. N240.00

medwhite0:

mole of H2SO4= 4.9/98= 0.05mole

mole of H+= 2x 0.05

= 0.10mole

number of ions= 6.02*10"23 * 0.1

=6.02*10"22 ions.

Correct

SwagkingDope:
Uncle McHenry pls is number of ions the same as number of moles

note.
if you're to find the number of ions,molecules, atoms... you use Avagadro's number which is 6.23×10"23.
but 1mole =6.023×10"23

Medwhite...has done justice to the question.



I'm not an uncle...McHenry is okay.

What is the number of hydrogen ions present in a solution containing 4.9g of tetraoxosulphate (vi) acid (H=1 S=32 O=16)

SwagkingDope:
Which of these will be neutral to litmus?

A.NaCl
B.FeCl2
C.NH4Cl
D.CaSO4

A
post the questions at once...pls.

SwagkingDope:
The chemicals produced by ants for communication are

A.Vitamins
B.Pheromones
C.Enzymes
D.Hormones

B

SwagkingDope:
Which of these is the smallest?

A.DNA
B.Chromatin
C.Gene
D.Chromosome

DNA

d1ckdharay:

ogini..
Hw many tymx u wan wrong mi...

Lol sorry bro...I tot I post it once.

SwagkingDope:
Albinos lack what pigment in their skin?


A.Carotine
B.Rhesin
C.Elamin
D.NOTA

C. melanin

SwagkingDope:
Another one

What is the ratio of hydrogen to oxygen in H2O?

A.1:8
B.1:2
C.2:1
D.1:3

well it's for mole it's 2:1
for mass it's 1:8

McHenry99:
An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?

A. water


B. moist SO2


C. acidified KMnO4 and water


D. water, acidified KMnO4 and oxygen

SO2 + H2S-----> H20 + S

d1ckdharay:

D

wrong

clintonopah:
c

Wrong

medwhite0:

hmm. B

Correct

d1ckdharay:

D

wrong

An eruption pollution an environment with gas suspected to be H2S, a poisonous gas. A residue team should spray the environment with?

A. water


B. moist SO2


C. acidified KMnO4 and water


D. water, acidified KMnO4 and oxygen

clintonopah:
okay please.. What of the second question

that should be +1

clintonopah:
okay please.. What of the second question

He has explained it...oxidation no of hydrogen is +1

clintonopah:
O is -2 ...explain please

Oxygen is -2...yea....but in hydrogenperoxide it is -1 and not -2.

RobinHez:

how u take do am?

I av posted the workings.

RobinHez:
If the velocity of light in air is 3.0x10^8 ms-1, find the velocity of light in a medium whose refractive index is 1.5 ?
A. 5*10^8
B. 5.0x10^7
C. 2.0x10^8
D. 2.5x10^7

refractive index=velocity of light in air/velocity of light a medium

1.5=3×10"8/V
V=2×10"8mls C

McHenry99:
Gunpowder is made from charcoal, sulphur and potassium trioxonitrate (V). The salt in the mixture performs the function of?

A. an oxidant
B. a reductant
C. a solvent
D. a catalyst

View Explanation
Question No:1252
Which of the following reactions is (are) feasible?
(i)Br2(I) + 2Cl(aq) 2Br(aq) + Cl2(g)
(ii) 2l(aq) + Br2(I) 2Br(aq) + I2(s)
(iii) 2F(aq) + Cl2(g) 2Cl(aq) + F2(g)
(iv)2F(aq) + Br2(I) 2Br(aq) + F2(g).

A. i
B. ii
C. i and iii
D. iii and iv

View Explanation
Question No:1253
Bleaching powder, CaOCl2.H2O, deteriorates on exposure to air because?

A. it loses its water of crystallization
B. atomspheric nitrogen displaces chlorine from it
C. carbon (IV) oxide of the atmosphere displaces chlorine from it
D. bleaching agents should be stored in solution

View Explanation
Question No:1254
The products of the thermal decomposition of ammonium trioxonitrate (V) are?

A. N2O and oxygen
B. NH3 and oxygen
C. nitrogen and water
D. N2O and water

View Explanation
Question No:1255
The scale of a chemical balance is made of iron plate and coated with copper electrolytically because?

A. iron is less susceptible to corrosion than copper
B. copper is twice as susceptible to corrosion as iron
C. copper is less susceptible to corrosion than iron
D. copper and iron are equally susceptible to corosion

THE CORRECT ANS.
A
B (no halogen can displace fluorine...but III and IV says otherwise...ii is the only FEASIBLE reaction there
C
D
C

Pukka36:
CBBDC

3/5

DoctorAB:
ADADC

3/5

medwhite0:

CBCCC

3/5