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Published on: 28/11/2025
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.
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1.
Natural rubber has _______.
alternate cis- and trans-configuration
random cis- and trans-configuration
all cis-configuration
all trans-configuration
2.
The correct corresponding order of names of four aldoses with configuration given below Respectively is ______.
L-Erythrose, L-Threose, L-Erythrose, D-Threose
D-Threose, D-Erythrose, L-Threose, L-Erythrose,
L-Erythrose, L-Threose, D-Erythrose, D-Threose
D-Erythrose, D-Threose, L-Erythrose, L-Threose
3.
The order of basic strength for methyl substituted amines in aqueous solution is _________.
N(CH3)3> N(CH3)2H> N(CH3)H2> NH3
N(CH3)H2>N(CH3)2H > N(CH3)3>NH3
NH3> N(CH3)H2> N(CH3)2 H>N(CH3)3
N(CH3)2H>N(CH3)H2> N(CH3)3> NH3
4.
The reagent used to distinguish between acetaldehyde and benzaldehyde is _______.
Tollens reagent
Fehling’s solution
2,4 – dinitrophenyl hydrazine
semicarbazide
5.
6.
Adsorption of a gas on solid metal surface is spontaneous and exothermic, then ______.
ΔH increases
ΔS increases
ΔG increases
ΔS decreases
7.
Faraday constant is defined as_______.
charge carried by 1 electron
charge carried by one mole of electrons
charge required to deposit one mole of substance
charge carried by 6.22 ×1010 electrons
8.
Which of the following relation is correct for degree of hydrolysis of ammonium acetate?
\(h=\sqrt { \frac { { K }_{ h } }{ C } } \)
\(h=\sqrt { \frac { { K }_{ a } }{ K_b } } \)
\(h=\sqrt { \frac { { K }_{ w } }{ { K }_{ a }.{ K }_{ b } } } \)
\(h=\sqrt { \frac { { { K }_{ a }.{ K }_{ b } } }{ { K }_{ w } } } \)
9.
After 2 hours, a radioactive substance becomes \(\left( \frac { 1 }{ 16 } \right) ^{ th }\) of original amount Then the half life (in min) is _______.
60 minutes
120 minutes
30 minutes
15 minutes
10.
The crystal with a metal deficiency defect is ________.
NaCl
FeO
ZnO
KCl
11.
Choose the correct statement.
Square planar complexes are more stable than octahedral complexes
The spin only magnetic moment of [Cu(Cl)4]2- is BM and it has square planar structure.
Crystal field splitting energy \(\left( { \Delta }_{ 0 } \right) \) [FeF6]4- is higher than the \((\Delta _{ 0 })\) of [Fe(CN)6]4-
crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+
12.
Which of the following oxidation states is most common among the lanthanoids?
+4
+2
+5
+3
13.
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
Br2 > I2 > F2 > Cl2
F2 > Cl2 > Br2 > l2
I2 > Br2 > Cl2 > F2
Cl2 > Br2 > F2 > I2
14.
15.
Which of the following reduction is not thermodynamically feasible?
\({ Cr }_{ 2 }{ O }_{ 3 }+2Al\longrightarrow { Al }_{ 2 }{ O }_{ 3 }+2Cr\)
\(\mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr} \longrightarrow \mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al}\)
\(3Ti{ O }_{ 2 }+4Al\longrightarrow 2A{ l }_{ 2 }{ O }_{ 3 }+3Ti\)
none of these
1.
(c)
all cis-configuration
2.
(d)
D-Erythrose, D-Threose, L-Erythrose, L-Threose
3.
(d)
N(CH3)2H>N(CH3)H2> N(CH3)3> NH3
4.
(b)
Fehling’s solution
5.
(c)
6.
ΔS is -ve
7.
IF = 96500 C = charge of one mole of e- charge of 6.022 x 10-23 electron
8.
(c)
\(h=\sqrt { \frac { { K }_{ w } }{ { K }_{ a }.{ K }_{ b } } } \)
9.
10.
(b)
FeO
11.
(d)
crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+
12.
(d)
+3
13.
(d)
Cl2 > Br2 > F2 > I2
14.
(d)
15.
(b)
\(\mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr} \longrightarrow \mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al}\)
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