REVISION EXERCISE FOR TEST 1
CHAPTER 1 - PRINCIPLE OF CHEMISTRY
Q1.
[Sept 2012]
[Ans: 17 protons; Cl⁻]
Q2.
[Apr 2014]
[ Br = 51 %; Br = 49 %]
79
81
Q3.
[Sept 2013]
[Ans: 121.756 a.m.u. ; Antimony, Sb]
Q4.
[Sept 2012]
[Ans: (i) P = 24.24 %, Q = 75.76 %]
[Ans: (ii) 35.45 a.m.u.]
REVISION EXERCISE FOR TEST 1
Q5.
[Apr 2014]
[Ans: 265.38 g]
Q6.
[Sept 2013]
[Ans: 1.346 × 1025 atoms]
Q7.
[Sept 2014]
[Ans: C3H4O3]
CHAPTER 2 – CHEMICAL BONDING
Q1.
[Sept 2014]
I
Ans:
F.C. = 0
I
N
I
Q2.
[Apr 2014]
Ans: O
N
O
F.C. = +1
REVISION EXERCISE FOR TEST 1
Q3.
[Sept 2013]
3-
O
Ans:
O
B
O
F.C. = -3
Q4.
[Apr 2013]
[Ans: (i) Bond order, C2H2 = 3, bond order, C2H4 = 2, bond order, C2H6 = 1]
[Ans: (ii) Order of bond length: C2H2 < C2H4 < C2H6]
[Bond order increases, bond length increases.]
Q5.
Arrange the compounds below in order of decreasing bond length and explain.
S – F, S – Br, S – Cl
[Ans: Bond length: S – Br > S – Cl > S – F]
Atomic size increases down the group (F,Cl,Br).
Thus, bond length increases & bond strength decreases.
Q6.
Arrange the compounds below in order of decreasing bond strength.
C = O, C – O, C ≡ O
[Ans: Bond strength: C ≡ O > C = O > C – O]
Bond length becomes shorter as bond order increases.
Q7.
State the type of bonding and briefly explain their physical properties.
(a) CsF(s)
(b) N2(g)
(c) Na(s)
[Ans: (a) ionic bond, (b) covalent bond, (c) metallic bond]
REVISION EXERCISE FOR TEST 1
CHAPTER 3 – STOICHIOMETRY & SOLUTION CONCENTRATION
Q1.
[Apr 2013]
[Ans: 0.25 m]
Q2.
[Apr 2014]
[Ans: (i) Al4C3]
[Ans: (ii) 77.75 %]
Q3.
[Apr 2013]
[Ans: (i) nFe = 0.0269 mole, nH2SO4 = 0.10 mole]
[Ans: (ii) Limiting reactant = Fe, excess reactant = H2SO4]
[Ans: 7.17 g]