It only contains molecules in solid state.

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 first one should be D, in solid state they dearth mobile ions to conduct electricity, second is B

Optimist1998:
340 all things being equal

I only hope we won't be marked down this year. And for Jamb to announce 250 put you on merit I'm still curious.

07066195821

Optimist1998:
Chemistry Which of the following is seperated by fractional crystallization A. HNO3 and NaCL B. KNO3 and NaOH C. CaCl2 and HNO3 D. CaSO4 and NaNO3 E. KNO3 and NaCl
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
Which of the following can be extracted using Thermit process A. Al B. Na C. Fe D. Ca E. Sn

Please


The first one should be option E, they are both salt; and soluble.

Nuel25846:

The answer is B....sound wave needs s medium to propagate,so it travels faster in a dense medium(cold air) than a less dense medium(hot air).
Speed=wavelenght * frequency

No this is not about density, it's temperature.

Optimist1998:
Did you take note of the negative sign in the first triangle?

Then my answer is 1.5m. What did you get?

Donpre:
If a sound wave goes from a cold air region to a hot air region, its wavelength will

A. increase
B. decrease
C. decrease then increase
D. remain constant

Give reason

What i can remember, stand to be corrected speed of sound is directly proportional to square root of temperature. Therefore the velocity of sound increases with temperature.
Velocity is also directly proportional to wavelength in V=F x wavelength. So the wavelength increases, option A.

Donpre, do you understand the concept behind progressive waves equation now?

I also suggest we bring more questions on other subjects, physics should NOT stop

Optimist1998:

You're dealing with triangles within the stipulated 2s to 5s time frame

Oh thanks, but got option E as my answer. What did you get?

SamanN:



Please How is the answer option D, i can only see a trapezium for t=2 & triangle for t=5.

Please any reply on this?

Nuel25846:
The instrument used for securing a
large number of similar charges by induction is called
A. electrophorus
B. capacitor
C. proof-plane
D. electroscope

I'm picking with no thinking, A.

Temilola21:

Hi,I...um...think the answer to the first and second question is D

The 2nd should be B

Optimist1998:
Basic velocity Time graph from SS1
Calculate the displacement between t = 2s and t = 5s of an object that moves along an axis and has the speed characterized below.

Please How is the answer option D, i can only see a trapezium for t=2 & triangle for t=5.

Optimist1998:
Comman see Moment questions

---

A man holds a 100 N load stationary in his hand. The combined weight of the forearm and hand is
20 N. The forearm is held horizontal, as shown


What is the vertical force F needed in the biceps?{cambridge may/june 2014 p11 ques 12}
A 750 N
B 800 N
C 850 N
D 900 N



A uniform plank AB of length 5.0 m and weight 200 N is placed across a stream, as shown below


A man of weight 880 N stands a distance x from end A. The ground exerts a vertical force FA on the plank at end A and a vertical force FB on the plank at end B.
As the man moves along the plank, the plank is always in equilibrium.The man stands a distance x = 0.50 m from end A. Use the principle of moments to
calculate the magnitude of FB.
{cambridge may/jun 2014 p21 q3}


Source: servantboy.com

Couldn't get the answer to the first one

Optimist1998:
Chemistry
Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.
The relative abundance of the isotope of mass number 37 is?

Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator

A. l and lll only
B. ll and lll only
C. l and ll only
D. l, ll and lll


The metal that liberates hydrogen from cold water in bubbles only is
A. Na
B. K
C. Ca
D. Al


What is the molar mass of an alkyne with the formula CxH14 ? (H = 1, C = 12)
A. 86g
B. 92g
C. 98g
D. 110g
E. 112g


Which of the following pairs of salts undergo hydrolysis?A. AlCI 3 and NH4 CI
B. AICI3 and NaCI
C. FeCI3 and KCI
D. Na2SO4 and K2SO4

*Inorder for this to make any meaning try as much as possible to explain your answers; this will held us all to identify our strengths/weaknesses*

Stand to be corrected, i think the first one is 3/4 or 0.75. I guess the second is I & II. The third should be Na, fourth should be 92. Still scrutinizing the 5th

pabostt:
Two long parallel wires X and Y carry currents 3A and 5A respectively. If the force experienced per unit length by X is 5 x 10-5N, the force per unit length experienced by wire Y is{UTME 2007}
A. 3 x 10-5N B. 3 x 10-6N C. 5 x 10-4N D. 5 x 10-5N

Hint to answer
Following the above formula and supporting it with Newton’s third law that states the if object X exert a force on object y, object y will exert the same force on X but in opposite direction.

For two parallel current carrying conductor, regardles of their current, they will exert the same force on each other but in opposite direction

You can visit for solution to some of past UTME questions: http://servantboy.com/category/physics-for-a-level-&-utme/

All I can recollect is F=Bil, force per unit length would be (F/l)

Mature minds please, no need to swear for them.

What a shame! The person above did not access the site before dropping comment.

Thanks lemme check.

I was watching the movie in a friend's house, but couldn't get it in stores. Decided to check online, i saw it, downloaded it only to see it's not subtitled on YouTube. The subtitled ones are few. I checked a whole lot of sites, some permits to watch only but i want to download. I saw a site to download but It's 505 MB. Long story short, the purpose of this rant is i need a site to download at cheaper size. It's a chinese movie "DECODED". Please help me with this, Regards.

Hello jumoke, I've donated Emerald since Friday. It's way past 50 hours now. Please help me look into it. Username is Ajoms.