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NEET Chemistry MCQ
Halogen Family Mcq Neet Chemistry
Quiz 4
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Q.1
Chlorine gas is dried over [ CPMT 1980]
0%
a) CaO
0%
b) NaOH
0%
c) KOH
0%
d) Con H2SO4
Explanation
Conc H2SO4 being dehydrating agent absorbs moisture from chlorine gas but do not react with it Answer: (d)
Q.2
A 500gm toothpaste sample has 0.2gm fluoride concentration. What is the concentration of F- ions in terms of ppm level [ AIIMS 1992]
0%
a) 250
0%
b) 200
0%
c) 400
0%
d) 1000
Explanation
0.2 gm = 200 mg 1mg per kg is 1ppm Thus 200 mg in 500 gm = 400ppm Answer: (c)
Q.3
Chlorine gas is dried over [ CPMT 1980]
0%
a) CaO
0%
b) NaOH
0%
c) KOH
0%
d) Con H2SO4
Explanation
Conc H2SO4 being dehydrating agent absorbs moisture from chlorine gas but do not react with it Answer: (d)
Q.4
Which halogen is most electropositive [ MP PMT 1988]
0%
a) F
0%
b) Cl
0%
c) Br
0%
d) I
Explanation
Down the group ionization energy decreases metallic character increases, electronegativity decreases Answer: (d)
Q.5
Hydrogen fluoride is a liquid unlike other hydrogen halides because [ MP PMT 1990]
0%
a) Fluorine atom is smaller in size
0%
b) HF is the weakest acid
0%
c) Fluorine is highly reactive
0%
d) HF molecules form intermolecular H-bonds
Explanation
Answer:(d)
Q.6
Elements of which of the following groups will form anions most readily? [ CBSE PMT 1992]
0%
a) Oxygen family
0%
b) Nitrogen family
0%
c) Halogens
0%
d) Alkali metals
Explanation
HAlogen s have seven electrons in outer orbit thus have strong tendency to accept electrons Answer: (c)
Q.7
Which of the following is a pseudohalide? [ AIIMS 1980]
0%
a) CN-
0%
b) ICl
0%
c) IF5
0%
d) I3-
Explanation
CN- behaves like halide but is not halide Answer: (a)
Q.8
A ga reacts with CaO but not with NaHCOthe gas is .. [AFMC 1987]
0%
a) CO2
0%
b) Cl2
0%
c) N2
0%
d) O2
Explanation
Answer: (b)
Q.9
Which of the following is strongest acid [ IIT 1989]
0%
a) ClO3(OH)
0%
b) ClO2(OH)
0%
c) SO(OH)2
0%
d) SO2(OH)2
Explanation
More the oxidation number of central atom more the acidic compound Answer:(a)
Q.10
The correct increasing order of ionic size is .. [ IIT 1991]
0%
a) Mg2+ < Na+ < F- < O2- < N3-
0%
b) Na+ < Mg2+ < F- < O2+ < N3-
0%
c) N3- < O2- < F- < Na+ < Mg2+
0%
d) F- < N3- < O2- < Mg2+ < Na+
Explanation
All the species are isoelectronic. their size increases as the nuclear charge decreases Also cations are smaller in size than anions Number of protons in following N =7, O = 8, F = 9, Na=11, Mg= 12 So correct order is Mg2+ < Na+ < F- < O2- < N3- Answer: (a)
Q.11
Chloride acts as a bleaching agent only in presence of ... [ IIT 1983]
0%
a) Dry air
0%
b) Moisture
0%
c) Sunlight
0%
d) Pure oxygen
Explanation
Bleaching action of chlorine is only in presence of moisture where nascent oxygen is displaced from H2O Answer: (b)
Q.12
The correct increasing order of bond dissociation energy for N2, O2, F2, cl2 is [ IIT 1988]
0%
a) N2 < O2 < F2 < Cl2
0%
b) F2 < Cl2 < O2
0%
c)F2 < Cl2 < N2 < O2
0%
d) N2 < Cl2 < F2
Explanation
Answer: (b)
Q.13
Which of the following halogen oxide is ionic? [ CPMT 1989]
0%
a) ClO2
0%
b) BrO2
0%
c) I2O5
0%
d) I4O9
Explanation
I4O9 is ionic as it is the iodate of I3+ cation written as iodine triiodate [I]+2 [IO3]3- Answer:(c)
Q.14
As the atomic number of Halogens increases the halogens .. [ MP PMT 1991]
0%
a) Lose their outermost electrons less readily
0%
b) Become lighter in colour
0%
c) Gain electrons less easily
0%
d) Becomes less dense
Explanation
Down the group metallic character increases, hence gain electron less easily Answer: (c)
Q.15
Hydrogen bond is strongest in [ IIT 1986]
0%
a) O - H … S
0%
b) S - H … O
0%
c) F - H … F
0%
d) F - H … O
Explanation
Difference in electro negativity is maximum in HF Answer: (c)
Q.16
Euchlorine is a mixture of .. [CPMT 1988]
0%
a) Cl2 and SO2
0%
b) Cl2 and ClO2
0%
c) Cl2 and CO
0%
d) None of these
Explanation
Mixture of Cl2 and ClO2 acts as a bleaching agent and called euchlorine Answer: (b)
Q.17
Which of the following is a false statement? [ Pb CET sample paper 1990]
0%
a) Halogens are strongly oxidising agents
0%
b) Halogens shows only -1 oxidation state
0%
c) HF molecules form intermolecular hydrogn bonding
0%
d) Fluorine is highly reactive
Explanation
halogen shows -1, +1, +3, +5, +7 oxidation states Answer:(b)
Q.18
Strongest hydrogen bond is shown by [ CBSE PMT 1992]
0%
a) Water
0%
b) Ammonia
0%
c) Hydrogen fluoride
0%
d) Hydrogen sulphide
Explanation
Difference in electro negativity is more in HF thus forms strongest hydrogen bond Answer: (c)
Q.19
Iodine is formed when KI reacts with a solution of [ MLNR 1984]
0%
a) ZnSO4
0%
b) CuSO4
0%
c) FeSO4
0%
d) (NH4)2SO4
Explanation
I- ion being weak reducing agent reduces Cu2+ ions to Cu+ ions and itself gets oxidised to I2 2CuSO4 + 4KI → 2CuI + I2 + 2K2SO4 Answer: (b)
Q.20
Bromine can be liberated from potassium bromide solution by the action of .. [IIT 1987]
0%
a) Iodine solution
0%
b) Chlorine water
0%
c) Sodium chloride
0%
d) Potassium iodide
Explanation
Answer: (b)
0 h : 0 m : 1 s
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