Correct!nd thks 4 xplainin

joseboy199:
ans is c...upthrust is equal 2 d weight of object displace.
there.upthrust=3.7*10=37N

mayorall: Whats the percentage composition of oxygen in K2Cr2O7?
Cr =52
k = 39
0 = 16

A.14.20
B.26.53
C.38.09
D.35.37

Cr=52x2=104 , K=39x2=78 ,O=16x7=112 so Rmm=112+78+104=294 %comp.=mass of element / RMM of compound x 100 , 112x100/294=38.09g

t.boy007:
i guess the element which have variable oxidation number in halogen is astatine.
Reason:it belongs to the d-block orbital..

very true cos the only elements with variable oxidation states are the transition metals.

mayorall: Which of d folowin z a polysaccharide
a. glucose
b. fructose,
c.cellulose
d.maltose

2 wch of d 4loin posses mammary gland
a. Dogfish
b. Whale
c. Shark
d. Catfish

3.The function of ribosomes in cells is
a. Starch synthesis
b. Lipid storage
c. Transport materials
d. Protein synthesis

4.The functn of tricocytst in paramecium is
a movement
b defence
c excretion
d reproduction.

cellulose is a polysacharride, other 3 are mono

.

buzyguy: The orbitals dat overlapp in chlorine molecule are?a)s & p (b)p & p (c)s & s (d)none

b, p&p overlap.

buzyguy: It may nt b included in jmb syllabus bt am teln u ds z a simple questn evn ssce studnt cn xplain vry wel.itz jxt to knw da parts where our organs fall.do u mean duodenum z located at the upper area of our abdomen?i thk itz part of da bowel,we r all here to learn.

Not at all boss.....its wat I read in an advance anatomy test book....duodenum z also part of it boss.

buzyguy: Itz lewis base,i wonda o

What will happen if u dissolve SO2 in water....u will definitely get an acidic solution....or have u seein base of non metals before the organic ones...Boss it was predicted as lewis acid......

Isryl02: cellulose is a polysacharride, other 3 are mono

Not all is monosaccharride..maltose is a dissacharride...

What current in ampere will deposit 20g of aluminium in 2 hours?....
A.32
B.8
C.4
D.16

Al =27, F=96500mol

The POH of a solution of 0.25moldm^-3 of HCl is?.
A.12.40
B.13.40
C.14.40
D.14.60

How many moles of limestone will be required to produce 5.6g of CaO?
A. 0.56
B. 0.10
C. 0.20
D. 1.12

mayorall: How many moles of limestone will be required to produce 5.6g of CaO?
A. 0.56
B. 0.10
C. 0.20
D. 1.12

Limestone----CaCO3 , Eqn of rxn ----
CaCO3---->CaO+CO2 (decomposition rxn)
1mol of CaCO3 yields 56grms of CaO then 5.6grms of CaO=y moles of CaCO3 so, 56y=5.6g ,Y=0.10moles option (B)

mayorall: The POH of a solution of 0.25moldm^-3 of HCl is?.
A.12.40
B.13.40
C.14.40
D.14.60

PH=-log10(H+)
-log10(0.25)
=-(-0.6)
PH=+0.6
PH+POH=14
POH=14-0.6
POH=13.40 (B)

Tizzie:
PH=-log10(H+)
-log10(0.25)
=-(-0.6)
PH=+0.6
PH+POH=14
POH=14-0.6
POH=13.40 (B)

Nice one boss.
But remember you wont be able to press log on your jamb calculator...xo aw do we solve manually..

I dnt dispute that ur answer if i shld ansa it i wld go for lewis acid bt a young lecture proves it wrng!anywy dat mayb da advanc part of it,we r all here for jamb so we nid jamb tnz u r rite bro.ds remindz me of NH4CL which is believed to undergo sublimatn ,does nt wen it comes to advanc analysis

mayorall:

What will happen if u dissolve SO2 in water....u will definitely get an acidic solution....or have u seein base of non metals before the organic ones...Boss it was predicted as lewis acid......

Miz alot,apy sundae to all

Correct

Isryl02: b, p&p overlap.

i have missed a lot. Thumbs up all!

mayorall:

Nice one boss.
But remember you wont be able to press log on your jamb calculator...xo aw do we solve manually..

Lol,Boss ke?? I'm a girl abeg,about the Log thing I dunno any manual method,except 4-figure table or calc. If you know You can help.

In a cell, the genes are carried by
A. Nuclear membrane
B. Chromatin threads
C. Lysosomes
D. Mitochondria.

A lewis acid is joined to a lewis base via?
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. Coordinate covalent bond

The major source of oxides of nitrogen is from the burning of
A. Coal
B. Wood
C. Fuel
D. Chlorofluorocarbons

B

Simplefemo: In a cell, the genes are carried by
A. Nuclear membrane
B. Chromatin threads
C. Lysosomes
D. Mitochondria.

C

Simplefemo: The major source of oxides of nitrogen is from the burning of
A. Coal
B. Wood
C. Fuel
D. Chlorofluorocarbons

D

Simplefemo: A lewis acid is joined to a lewis base via?
A. Ionic bond
B. Covalent bond
C. Metallic bond
D. Coordinate covalent bond

Tizzie: Lol,Boss ke?? I'm a girl abeg,about the Log thing I dunno any manual method,except 4-figure table or calc. If you know You can help.

It doesnt matter...a gal cn also be boss

Tizzie: Limestone----CaCO3 , Eqn of rxn ----
CaCO3---->CaO+CO2 (decomposition rxn)
1mol of CaCO3 yields 56grms of CaO then 5.6grms of CaO=y moles of CaCO3 so, 56y=5.6g ,Y=0.10moles option (B)

Nice one....
FORMULA METHOD
CaCO3 ==> CaO + Co2
using

moles = mass given/molar mass

moles = 5.6/CaO (40 + 16)

moles = 5.6/56

moles = 0.10mol.....

Lucas reagent is used to test for
A. Alkanes
B. Alkanoic acid
C. Alkanols
D. Amines

Isryl02: cellulose is a polysacharride, other 3 are mono

except maltose which is disaccharide

Simplefemo: Lucas reagent is used to test for
A. Alkanes
B. Alkanoic acid
C. Alkanols
D. Amines

C
(alkanols)