Hard Multiple choice A+ Chemistry
Questions and Answers 2024
In the compound [ICl2]^+ and [SbCl6]^- the oxidation number of chlorine is -1
What are the oxidation numbers of I and Sb in the compound?
I Sb
A +1 +5
B +1 +3
C +3 +5
D +3 +7 - ANS-C +3 +5
What is the Formula of Ammonuim Sulfide?
A NH4S
B NH4S04
C (NH4)2S
D (NH4)2S04 - ANS-C (NH4)2S
Explanation-
(NH4+)2 + (S^-)1
If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
0.48 s
Calcium Nitrate [Ca(NO3)2] , decomposes when heated ,as shown below.
Ca(NO3)2(s) > CaO (s) + 2NO2 (g) + 1/2 O2(g)
A student decomposes 0.005mol of Ca(NO3)2 and collects the gas that is produced.
Calculate the volume of gas that the student should expect to collect, measured at room
temperature and pressure.
A 60cm^s
B 120cm^3
C 240cm^3
D 300cm^3 - ANS-D 300cm^3
Working out
2.5x 0.005=0.0125mol
v=nx24000(cm^3)
=300
, What is the oxidation number of nitrogen in Mg(NO3)2?
A -3
B +2
C +5
D +6 - ANS-C +5
If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
3.12s
What is the shape around the carbon atom in graphene?
A linear
B pyramidal
C tetrahedral
D trigonal planar - ANS-D trigonal planar
Explanation carbon bonds with 3 carbon with 1 double bond and 2 single bonds make a
120-degree angle therefore the shape is a trigonal planar
How many orbitals are occupied in a silicon atom?
A5
B7
C8
D 9 - ANS-A 5
Explanation there is 1 orbital in the s-sub shell and 3 orbitals in the p-subshell 2
electrons fill each subshell however on 3s^2 electrons shaw an orbital each to maximise
stability. If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
3.55s
Which compund has non-polar molecules?
A E-1,2-dichlorobut-2-ene
B E-2,3 -dichlorobut-2-ene
C Z-2,3-dichlorobut-2-ene
D Z-1,4-dichlorobut-2-ene - ANS-B E-2,3-dichlorobut-2-ene
Check for a visual explanation
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
Questions and Answers 2024
In the compound [ICl2]^+ and [SbCl6]^- the oxidation number of chlorine is -1
What are the oxidation numbers of I and Sb in the compound?
I Sb
A +1 +5
B +1 +3
C +3 +5
D +3 +7 - ANS-C +3 +5
What is the Formula of Ammonuim Sulfide?
A NH4S
B NH4S04
C (NH4)2S
D (NH4)2S04 - ANS-C (NH4)2S
Explanation-
(NH4+)2 + (S^-)1
If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
0.48 s
Calcium Nitrate [Ca(NO3)2] , decomposes when heated ,as shown below.
Ca(NO3)2(s) > CaO (s) + 2NO2 (g) + 1/2 O2(g)
A student decomposes 0.005mol of Ca(NO3)2 and collects the gas that is produced.
Calculate the volume of gas that the student should expect to collect, measured at room
temperature and pressure.
A 60cm^s
B 120cm^3
C 240cm^3
D 300cm^3 - ANS-D 300cm^3
Working out
2.5x 0.005=0.0125mol
v=nx24000(cm^3)
=300
, What is the oxidation number of nitrogen in Mg(NO3)2?
A -3
B +2
C +5
D +6 - ANS-C +5
If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
3.12s
What is the shape around the carbon atom in graphene?
A linear
B pyramidal
C tetrahedral
D trigonal planar - ANS-D trigonal planar
Explanation carbon bonds with 3 carbon with 1 double bond and 2 single bonds make a
120-degree angle therefore the shape is a trigonal planar
How many orbitals are occupied in a silicon atom?
A5
B7
C8
D 9 - ANS-A 5
Explanation there is 1 orbital in the s-sub shell and 3 orbitals in the p-subshell 2
electrons fill each subshell however on 3s^2 electrons shaw an orbital each to maximise
stability. If you still don't understand see
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
yt @https://www.youtube.com/watch?v=BW0xZj9CVA8
3.55s
Which compund has non-polar molecules?
A E-1,2-dichlorobut-2-ene
B E-2,3 -dichlorobut-2-ene
C Z-2,3-dichlorobut-2-ene
D Z-1,4-dichlorobut-2-ene - ANS-B E-2,3-dichlorobut-2-ene
Check for a visual explanation
OCR AS Level Chemistry A Breadth in Chemistry May 2016 H032/01 Q1-20 on
