12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Chemistry p Block Elements II English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test
1.
The high reactivity of fluorine is due to________.
high ionisation energy
low bond dissociation energy
low electron affinity
high electro negativity
2.
Which reaction is not feasible.
\({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)
\(2 \mathrm{KBr}+\mathrm{I}_{2} \longrightarrow 2 \mathrm{KI}+\mathrm{Br}_{2}\)
\(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)
\(2 \mathrm{KI}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{KBr}+\mathrm{I}_{2}\)
3.
The incorrect statement regarding structure of ozone is______.
Bond angle is less than 120°
It is linear
The two oxygen-oxygen bond length in ozone are identical
Both (b) and (c).
4.
Orthophosphorus acid on heating gives______.
Hypophosphorous
Orthophosphoric acid
Phosphine gas
both (b) and (c)
5.
Which one of the following orders is not in accordance with the property stated against it?
F2 > CI2 > Br2 > I2: Bond dissociation energy
HI > HBr > HCI > HF: Acidic property in water
F2 > Cl2 > Br2 > l2: Oxidising power
F2 > Cl2 > Br2 > l2: Electronegativity
6.
Least volatile hydrogen halide is ______.
HF
HCI
HBr
HI
7.
Hot concentrated H2SO4 is moderately strong oxidising agent which of the following reactions does not show oxidising behaviour?
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)
8.
S-S bond is present in _______.
H2S2O7
H2SO5
H2S2O6
H2S2O6
9.
The hybridisation and shape of SF6 is respectively?
sp3d2, square planar
sp3d2, octahedral
sp3d see-saw
sp3d, trigonal bipyramidal
10.
Which of the following halides of group 15 is not hydrolysed?
NF3
PF3
NI3
Both (a) and (b)
11.
Which of the following is correct?
H3PO3 is dibasic and reducing
H3PO3 is dibasic and non-reducing
H3PO4 is tribasic and reducing
H3PO3 is tribasic and non-reducing
12.
Among the following the correct order of acidity is ________.
HClO2 < HClO < HClO3 < HClO4
HClO4 < HClO2 < HClO < HClO3
HClO3 < HClO4 < HClO2 < HClO
HClO < HClO2 < HClO3 < HClO4
13.
Which of the following is strongest acid among all?
HI
HF
HBr
HCl
14.
XeF6 on complete hydrolysis produces________.
XeOF4
XeO2F2
XeO3
XeO2
15.
Which one of the following compounds is not formed?
XeOF4
XeO3
XeF2
NeF2
16.
Among the following, which is the strongest oxidizing agent?
Cl2
F2
Br2
l2
17.
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
6N
4N
2N
none of these
18.
P4O6 reacts with cold water to give _______.
H3PO3
H4P2O7
HPO3
H3PO4
19.
An element belongs to group 15 and 3rd period of the periodic table, its electronic configuration would be_______.
1s2 2s2 2p4
1s2 2s2 2p3
1s2 2s2 2p6 3s2 3p2
1s2 2s2 2p6 3s2 3p3
20.
In which of the following, NH3 is not used?
Nessler's reagent
Reagent for the analysis of IV group basic radical
Reagent for the analysis of III group basic radical
Tollen's reagent
1.
(b)
low bond dissociation energy
2.
(b)
\(2 \mathrm{KBr}+\mathrm{I}_{2} \longrightarrow 2 \mathrm{KI}+\mathrm{Br}_{2}\)
3.
(b)
It is linear
4.
(d)
both (b) and (c)
5.
(a)
F2 > CI2 > Br2 > I2: Bond dissociation energy
6.
(a)
HF
7.
(d)
\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)
8.
(d)
H2S2O6
9.
(b)
sp3d2, octahedral
10.
(d)
Both (a) and (b)
11.
(a)
H3PO3 is dibasic and reducing
12.
(d)
HClO < HClO2 < HClO3 < HClO4
13.
(a)
HI
14.
(c)
XeO3
15.
(d)
NeF2
16.
(b)
F2
17.
(a)
6N
18.
(a)
H3PO3
19.
(d)
1s2 2s2 2p6 3s2 3p3
20.
(a)
Nessler's reagent
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