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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.
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.
dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.
Disinfectants harm the living tissues
A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant
Chlorine and iodine are used as strong disinfectants
2.
3.
The major product of the following reaction
4.
Ethanoic acid \(\overset { P/{ Br }_{ 2 } }{ \longrightarrow } \) 2-bromoethanoic acid. This reaction is called _______.
Finkelstein reaction
Haloform reaction
Hell – Volhard – Zelinsky reaction
none of these
5.
6.
Fog is colloidal solution of _______.
solid in gas
gas in gas
liquid in gas
gas in liquid
7.
The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is______.
2.88 S cm2mol-1
11.52 S cm2mol-1
0.086 S cm2mol-1
28.8 S cm2mol -1
8.
The pH of an aqueous solution is Zero. The solution is _______.
slightly acidic
strongly acidic
neutral
basic
9.
10.
A two dimensional solid pattern formed by two different atoms X and Y is shown below. The black and white squares represent atoms X and Y respectively. The simplest formula for the compound based on the unit cell from the pattern is _______.
XY8
X4Y9
XY2
XY4
11.
In which of the following coordination entities the magnitude of Δ0 will be maximum?
[Co(CN)6]3-
[Co(C2O4)3]3-
[Co(H2O)6]3+
[Co(NH3)6]3+
12.
Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?
Cr
Pd
Pt
none of these
13.
Which of the following is strongest acid among all?
HI
HF
HBr
HCl
14.
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
15.
Wolframite ore is separated from tinstone by the process of________.
Smelting
Calcination
Roasting
Electromagnetic separation
1.
(a)
dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.
2.
(d)
3.
(b)
4.
(c)
Hell – Volhard – Zelinsky reaction
5.
(c)
6.
dispersion medium-gas
dispersed phase-liquid
7.
Λ = k/W x 10−3 mol−1 dm3
\(=\frac{ 5.76 \times 10^{−3} S cm^{−1} \times 10^{−3}}{0.5} = mol^{-1} dm^{3}\)
\(=\frac{ 5.76 \times 10^{−3} S cm^{−1} \times 10^{−3}}{0.5}\) S cm-1 mol−1 dm3
= 11.52 S cm2mol-1
8.
pH = -log10 [H+]
\(\therefore\) [H+] = 10-pH
100 = 1
[H+] = 1 M
The solution is strongly acidic
9.
(d)
10.
(a)
XY8
11.
In all the complexes, the central metal ion is Co3+, among the given ligands CN- is the strongest ligand, which causes large crystal
field splitting i.e maximum Δ0
12.
Cr ⇒ [Ar]3d54s1
13.
(a)
HI
14.
(b)
B3H6
15.
(d)
Electromagnetic separation
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