12th Standard Syllabus & Materials
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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 மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Creative One Mark Questions with Answer Key - Part Three
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 buffer present in human blood is _______.
CH3COOH + CH3COONa
NH4OH + NH4CI
H2CO3 + H\({ CO }_{ 3 }^{ - }\)
CH3COOH + CH3COONa and NH4OH + NH4CI
2.
Auto catalysis is observed in the reaction given below.
CH3COOC2H5+H2O➝ CH3COOH+C2H5OH
CH3COOC2H5
H2O
CH3COOH
C2H5OH
3.
A+B \(\longrightarrow \) C; ∆H = 60 kJ mol-1 Eaf = 150 kJ. What is the activation energy of the backward reaction?
210 kJ
105 kJ
90 kJ
145 kJ
4.
Hot concentrated H2SO4 is moderately strong oxidising agent which of the following reactions does not show oxidising behaviour?
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\(Cu+2H_{ 2 }{ SO }_{ 4 }\longrightarrow { CuSO }_{ 4 }+{ SO }_{ 2 }+{ 2H }_{ 2 }O\)
\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)
5.
Which of the following exists as covalent crystals in solid state?
phosphorus
sulphur
chlorine
silicon
6.
If 'a' is the length of unit cell, then which one is correct relationship?
For simple cubic lattice, radius of metal atom =\(\frac{a}{2}\)
For bee lattice, radius of metal atom \(=\frac { \sqrt { 3a } }{ 4 } \)
For fcc lattice, radius of metal atom \(=\frac { a }{ 2\sqrt { 2 } } \)
All of these
7.
Oxidation state exhibited by group 13 elements is ______
+1, +2 and +3
+1 and +3
+1 and +4
+2 +3 and +4
8.
Oxygen stabilises higher oxidation state because_______.
it is electronegative
of its tendency to form multiple bond
of large size
of small size
9.
Sulphide ore is converted to oxide form by using the process________.
Calcination
Roasting
Smelting
Leaving
10.
IUPAC name of H2[Ptcl6] is _______.
Hexa chloridoplatinum (IV) acid
Hexa chloridoplatinum (IV) acid
Hexachloridoplatinic (IV) acid
Dihydrogenhexaehloro platinate (IV)
1.
(c)
H2CO3 + H\({ CO }_{ 3 }^{ - }\)
2.
(c)
CH3COOH
3.
(c)
90 kJ
4.
(d)
\({ CaF }_{ 2 }+{ H }_{ 2 }SO_{ 4 }\longrightarrow { CaCO }_{ 4 }+2HF\)
5.
(d)
silicon
6.
(d)
All of these
7.
(b)
+1 and +3
8.
(b)
of its tendency to form multiple bond
9.
(b)
Roasting
10.
(d)
Dihydrogenhexaehloro platinate (IV)
12th Standard Syllabus & Materials
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