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```1.
EXERCISE â IV
PREVIOUS YEARS
L EVEL â I
JEE MAIN
The weight of 2.01 Ã 1023 molecules of CO is [AIEEE-2002]
(A) 9.3 gm
(C) 1.2 gm
Sol.
(B) 7.2 gm
(D) 3 gm
Sol.
5.
2.
In an organic compound of molar mass 108 gm
molâ1 C, H and N atoms are present in 9 : 1 : 3.5
by weight. Molecular formula can be â
[AIEEE-2002]
(A) C6H8N 2
(C) C5H6N 3
How many mol es of magnesium phosphate,
Mg3(PO 4) 2 will contain 0.25 mole of oxygen atoms ?
[AIEEE 2006]
(A) 3.125 Ã 10 â2
(B) 1.25 Ã 10 â2
(C) 2.5 Ã 10 â2
(D) 0.02
Sol.
(B) C7H10N
(D) C4H18N3
Sol.
6.
3.
Number of atoms in 560 gm of Fe (atomic mass
56 g molâ1) is â
[AIEEE-2003]
(A) is twice that of 70 gm N
(B) is half that of 20 gm H
(C) both are correct
(D) None is correct
(C) 67.2 L H 2(g) at STP is produced for every
mole Al that reacts
(D) 11.2 L H 2(g) at STP is produced for every
mole HCl (aq) consumed
Sol.
6.02 Ã1020 molecules of urea are present in
100 ml of its solution. The concentration of urea
solution is [AIEEE-2004]
(A) 0.001 M
(B) 0.01 M
(C) 0.02 M
(D) 0.1 M
(Avogadro constant, N A = 6.02 Ã10 23 mol â1)
[AIEEE 2007]
2Al (s)+6HCl(aq) 2Al3+ (aq)+6Cl (aq)+3H2(g) ,
(A) 6L HCl (aq) is consumed for every 3L H2(g)
produced
(B) 33.6 L H 2(g) is produced regardless of
temperature and pressure for every mole Al
that reacts
Sol.
4.
In the reaction,
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