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CHEMISTRY MCQ PAPER 1 ...HELP!

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IGSTUDENT:
Someone please help!

Chemistry Paper1 MCQ : May 1995 Q.29 :
Properties of Auminium alloys:
1. low density
2. Good electricity
3.High strength

Which properties are required for making an aircraft:

A. 1 ONLY
B.2 ONLY
C. 1 AND 2 ONLY
D. 1 AND D ONLY.

As per me the answer should be D but Mark schemes says  "A".

As per our text book aluminium is strong ..a property needed to make an aircraft.

Pls explain!!!

aquarian93:
i think its high strength and low density

Q80BOY:
i agree with u,

i think it's answer D

IGSTUDENT:
Thanks !

IGSTUDENT:
MAY1995 Q35.. CAN SOMEONE PLS EXPLAIN THE DIAGRAM?ANSWER IS OK BUT THE QUESTION DIAGRAM IS CONFUSING.
CARBON DIOXIDE IS COLLECTED BY UPWARD DISPLACEMENT OF AIR (HIGHER DENSITY THAN AIR) WHEREAS THE DIAGRAM SHOWS A DOWNWARD DISPLACEMENT .

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