Chemistry MCQ thread...

[abdullah181994]

PLZ PLZ ANSWER THE ABOVE QUESTION

 

[aleem420]

6 The density of ice is 1.00 g cm–3.
What is the volume of steam produced when 1.00 cm3 of ice is heated to 323 °C (596 K) at a
pressure of one atmosphere (101 kPa)?
[1 mol of a gas occupies 24.0 dm3 at 25 °C (298 K) and one atmosphere.]
A 0.267 dm3 B 1.33 dm3 C 2.67 dm3 D 48.0 dm\

plz help.............

 

[xHazeMx]

yeah, the answer is A

Oh, really annoying of me...I read the question as charge density of anion. Dammit. :bad:

make sure u sleep well before the exam, u know what, i never relied on the CIE endorsed book

 

[aleem420]

6 The density of ice is 1.00 g cm–3.
What is the volume of steam produced when 1.00 cm3 of ice is heated to 323 °C (596 K) at a
pressure of one atmosphere (101 kPa)?
[1 mol of a gas occupies 24.0 dm3 at 25 °C (298 K) and one atmosphere.]
A 0.267 dm3 B 1.33 dm3 C 2.67 dm3 D 48.0 dm\

plz help.............

 

[xHazeMx]

6 The density of ice is 1.00 g cm–3.
What is the volume of steam produced when 1.00 cm3 of ice is heated to 323 °C (596 K) at a
pressure of one atmosphere (101 kPa)?
[1 mol of a gas occupies 24.0 dm3 at 25 °C (298 K) and one atmosphere.]
A 0.267 dm3 B 1.33 dm3 C 2.67 dm3 D 48.0 dm\

plz help.............

find the number of moles by using the density ( d=m/v then n= m/Mr ) and then put the number of moles in the equation PV=nRT and find out the volume

 

[Zishi]

yeah, the answer is A

Oh, really annoying of me...I read the question as charge density of anion. Dammit. :bad:

make sure u sleep well before the exam, u know what, i never relied on the CIE endorsed book

Oh, well, I don't rely that much either. But the value of enthalpy change of formation of HI is correct in it.

PLZ PLZ PLZ PLZ PLZ ANSWER THIS

Can't open it. It's better to past the question Or take screenshot if you want replies.

 

[xHazeMx]

Oh, well, I don't rely that much either. But the value of enthalpy change of formation of HI is correct in it.

thats correct which can be explained as ( less exothermic than HCl )

 

[grumpy]

abdullah here is your ans.
mole ratio is 1:2 that is 2 moles of metal salt and 1 mole of sodium sufite. sufite changes to sulfate and gives away 2 electrons.since there are two molecules of metal salt so electrons are disributed between the the two molesules of metal salt hence oxidation state becomes +2.

and alleem
you cant have the exact answer.the examiner has written the actual values and we calculate the theoretical values.
since ther is low pressure yes 1 atm is considerd low pressure we have the low volume

 

[Zishi]

Oh, well, I don't rely that much either. But the value of enthalpy change of formation of HI is correct in it.

thats correct which can be explained as ( less exothermic than HCl )

Yes, yes. Now I'm not tired anymore.

 

[TITTIITT]

The answer is B so 1 and 2 are correct.
What properties does the *bond have and why is 3 incorrect?

 

[xHazeMx]

Oh, well, I don't rely that much either. But the value of enthalpy change of formation of HI is correct in it.

thats correct which can be explained as ( less exothermic than HCl )

Yes, yes. Now I'm not tired anymore.

then solve the brain storming question i asked u before

 

[xHazeMx]

The answer is B so 1 and 2 are correct.
What properties does the *bond have and why is 3 incorrect?

there is no aldehyde or ketone group in this structure thats why 3 is incorrect. C=C bond decoulorise aqueous bromine. sodium hydroxide reacts with the ester group shown to form an acid and an alcohol so 1 and 2 are correct

 

[grumpy]

yara this is not a ketone group.
for ketone you have to have carbon chains on both sides

 

[TITTIITT]

The answer is B so 1 and 2 are correct.
What properties does the *bond have and why is 3 incorrect?

there is no aldehyde or ketone group in this structure thats why 3 is incorrect. C=C bond decoulorise aqueous bromine. sodium hydroxide reacts with the ester group shown to form an acid and an alcohol so 1 and 2 are correct

Thanks! I treated the =O as a ketone...

 

[wahab305]

plz help me at this......................
help me find which transportable gas is poisonous

 

[abdullah181994]

http://www.xtremepapers.me/CIE/Internat ... 7_qp_1.pdf
please visit this link and explian Q9 and Q10

 

[xHazeMx]

plz help me at this......................
help me find which transportable gas is poisonous

its OXYGEN .. obviously oxygen cant burn IN OXYGEN ..

 

[rahultaneja2010]

Can someone help me find the shapes of the following :
1) alcl3
2) ch3+
3) ph3

Pls show how u worked it out thanks .... Inshallah

 

[workinghard]

Ph3 is trigonal pyramidal
Ch3+ is im not sure but trigonal planar n ALCL3 is trigonal planar 4 sure!
dere s a lone group on P which reduces da angle n givs it pyramidal appearance
do u still need 2 c da struc?

 

[xHazeMx]

Can someone help me find the shapes of the following :
1) alcl3
2) ch3+
3) ph3

Pls show how u worked it out thanks .... Inshallah

1 and 2 have trigonal planar shape ( 120 degrees between the bonds because there are no lone pairs on the Al and C atoms ). PH3, it has 1 lone pair so the angle should be 107 but i remember one question they showed the angle as 104, i heared that this question was removed but anyways these are the shapes and angles