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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
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.
The unit of zero order rate constant is _____.
litre mol-1 sec-1
mol litre-1 sec-1
sec-1
litre2 sec-1
2.
Nitric oxide (NO) reacts with oxygen to produce nitrogen dioxide
2NO(g) + O2(g) ⟶ 2NO2(g)
If the mechanism of reaction is ______.
NO + O2 \(\overset { K }{ \rightleftharpoons } \) NO3 (fast)
NO3 + NO \(\overset { { K }_{ 1 } }{ \rightleftharpoons } \) NO2 + NO2 (slow)
Rate = K' [NO] [O2]
Rate = K' [NO] [O2]2
Rate = K' [NO]2 [O2]
Rate = K' [NO]3 [O2]
3.
In pseudo-order reactions ______.
The actual order of reaction is different from that expected using rate law expression
The concentration of at least one reactant is taken in large excess.
The concentration of reactant taken in excess may be taken as constant
All of these
4.
The hybridisation and shape of SF6 is respectively?
sp3d2, square planar
sp3d2, octahedral
sp3d see-saw
sp3d, trigonal bipyramidal
5.
In the Bragg's equation for diffraction of X-rays, 'n' represents _______.
The number of moles
Avogadro number
A quantum number
Order of reflection
6.
Boron compounds behave as Lewis acid, because of their _______.
ionisation property
acidic nature
covalent nature
electron deficient nature
7.
The catalytic activity of transition metals is due to ________.
the formation of a variety of oxidation states
the formation of intermediate products
the capability of forming interstitial compounds.
all the above
8.
Which of the following will give respective metal by self reduction?
Galena (Pbs)
HgS
ZnS
Both (a) & (b)
9.
Which of the following will exhibit linkage isomerism?
[Co(NH3)5 (NO2)]2+
[Co(H2O)5CO)]3+
[Fe(en)2CI2]+
all the above
10.
Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is _______.
both (b) and (c)
11.
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)________.
6.023 x 1023
6.023 x 1022
60.23 x 1023
\(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)
12.
Oxidation state of Iron and the charge on the ligand NO in [Fe(H2O)5NO]SO4 are_______.
+2 and 0 respectively
+3 and 0 respectively
+3 and -1 respectively
+1 and +1 respectively
13.
Which of the following lanthanoid ions is diamagnetic?
Eu2+
Yb2+
Ce2+
Sm2+
14.
The molarity of given orthophosphoric acid solution is 2M. Its normality is _______.
6N
4N
2N
none of these
15.
16.
Which one of the following reaction represents calcinations?
\(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)
\(2ZnS+3O_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)
\(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)
Both (a) and (c)
1.
(b)
mol litre-1 sec-1
2.
(c)
Rate = K' [NO]2 [O2]
3.
(d)
All of these
4.
(b)
sp3d2, octahedral
5.
(d)
Order of reflection
6.
(d)
electron deficient nature
7.
(d)
all the above
8.
(d)
Both (a) & (b)
9.
(a)
[Co(NH3)5 (NO2)]2+
10.
\(k=A{ e }^{ -\left( \frac { { E }_{ a } }{ RT } \right) }\)
In k = In A - \({ \left( \frac { { E }_{ a } }{ R } \right) }\) \(\left( \frac { 1 }{ T } \right) \)
This equation is of the form of a straight line y = mx+c
A plot of In k Vs \(\left( \frac { 1 }{ T } \right) \) gives a straight line with a negative slope.
11.
In bcc unit cell,
2 atoms = 1 unit cell
Number of atoms in 8 g of element is, Number of moles = 8g / 40 g mol-1 = 0.2 mol
1 mole contains 6.023 x1023 atoms
0.2 mole contains 0.2 x 6.023 x 1023 atoms
[1 unit cell / 2 atoms] x 0.2 x 6.023 x 1023
= 6.023 x 1022 unit cells.
12.
[\( \overset{+}{Fe}\)(H2O)5\( \overset{+}{NO}\)]2+ SO2-4
+1 and +1 respectively
13.
Yb2+ - 4f14 - no unpaired electrons - diamagnetic
14.
(a)
6N
15.
(d)
16.
(c)
\(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)
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