12th Standard Syllabus & Materials
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Published on: 25/08/2020
12th Standard Chemistry English Medium Model 1 Mark Book Back Questions (New Syllabus) 2020
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.
Terylene is an example of _______.
polyamide
polythene
polyester
polysaccharide
2.
Which of the following are epimers?
D(+)-Glucose and D(+)-Galactose
D(+)-Glucose and D(+)-Mannose
Neither (a) nor (b)
Both (a) and (b)
3.
Among the following the achiral amino acid is ______.
2-ethylalanine
2-methylglycine
2-hydroxymethylserine
Tryptophan
4.
The product formed by the reaction an aldehyde with a primary amine ________.
carboxylic acid
aromatic acid
schiff ’s base
ketone
5.
Phenyl methanal is reacted with concentrated NaOH to give two products X and Y. X reacts with metallic sodium to liberate hydrogen X and Y are ________.
sodium benzoate and phenol
Sodium benzoate and phenyl methanol
phenyl methanol and sodium benzoate
none of these
6.
7.
8.
Hair cream is _____.
gel
emulsion
solid sol
sol.
9.
How many faradays of electricity are required for the following reaction to occur MnO4-→ Mn2+
5F
3F
1F
7F
10.
What is the decreasing order of strength of bases
OH, NH2- H - C ≡ C and CH3 - CH2-
OH->NH2- >H-C≡C >CH3-CH2-
NH2->OH->CH3-CH2- >H-C≡C
CH3-CH2->NH2->H-C≡C->OH-
OH->H-C ≡ C->CH3-CH2- >NH2-
11.
The addition of a catalyst during a chemical reaction alters which of the following quantities?
Enthalpy
Activation energy
Entropy
Internal energy
12.
13.
As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl is _______.
chloro bis ethylenediamine nitrocobalt(III) chloride
chloridobis(ethane-1, 2-diamine)nitro K-O Cobaltate(III) chloride
chloridobis(ethane-1, 2-diammine)nitrito K-O Cobalt(II) chloride
chloridobis(ethane-1, 2-diamine)nitrito K-O Cobalt(III) chloride
14.
Which of the following compounds is colourless?
Fe3+
Ti4+
Co2+
Ni2+
15.
The basicity of pyrophosphorous acid ( H4P2O5) is _______.
4
2
3
5
16.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
17.
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S
\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide
Roasting of the sulphide to its oxide is thermodynamically feasible
Carbon and hydrogen are suitable reducing agents for metal sulphides
1.
(c)
polyester
2.
(d)
Both (a) and (b)
3.
(c)
2-hydroxymethylserine
4.
(c)
schiff ’s base
5.
6.
(d)
7.
(c)
8.
Emulsion-Dispersed phase
Dispersion meduun -liquid
9.
7MnO4- + 5e- → Mn2+ + 4H2O
5 moles of electrons i.e., 5F charge is required.
10.
(c)
CH3-CH2->NH2->H-C≡C->OH-
11.
A catalyst provides a new path to the reaction with low activation energy. i.e., it lowers the activation energy.
12.
(c)
13.
(d)
chloridobis(ethane-1, 2-diamine)nitrito K-O Cobalt(III) chloride
14.
(b)
Ti4+
15.
(b)
2
16.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
17.
(d)
Carbon and hydrogen are suitable reducing agents for metal sulphides
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