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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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TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Seven
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.
Cellulose is an example of _____ polymer.
synthetic
Natural
semisynthetic
none of the above
2.
Proteins which act as biological catalysts are called ________
enzymes
hormones
vitamins
polymers
3.
2-acetoxy benzoic acid is used as an _________
anti malarial
antihistamine
antipyretic
antidepressant
4.
The reduction of CH3 - CH2 - C ☰ N with sodium and alcohol results in the formation of
\({ CH }_{ 3 }-\underset { \overset { | }{ { NH }_{ 2 } } }{ CH } -{ CH }_{ 3 }\)
CH3- CH2- CH2- OH + N2
CH3 - CH2 - CH2 - NH2
CH3 - CH2 - NH2
5.
The properties of protein are determined by___________
nature of the amino acids
the position of NH2 group
the position of COOH group
all
6.
An example for reducing disaccharide is
glucose
fructose
sucrose
lactose
7.
SHE is _______.
Standard Helium Electrode
Standard Hydrogen Electrode
Standard Mercury Electrode
none of these
8.
Pick out the compound that reduces Tollen's reagent and Fehling's solution.
CH3CHO
CH3COCH3
CH3COOH
both (a) and (b)
9.
The oxidation of sodium sulphite by air is retarded by _______.
MnO2
H2S
Alcohol
AS2O3
10.
Which one of the following formula represents Ostwald's dilution law for a binary whose degree of dissociation is a and concentration C.
\(K=\frac{(1-α)C}{α}\)
\(K=\frac{α^2C}{1-a}\)
K = \(\frac{(1-a)C}{a^2}\)
K = \(\frac{α^2C}{(1-α)c}\)
11.
The number of secondary alcoholic group in glycerol is _______.
1
2
3
0
12.
Vitamin B2 is also known as ______.
Riboflavin
Thiamine
Nicotinamide
Pyridoxine
13.
Which of the following represents the correct order of acidity in the given compounds
FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
CH3COOH > ClCH2COOH > FCH2COOH > Br-CH2COOH
Cl CH2COOH > CH3COOH > BrCH2COOH > ICH2COOH
14.
In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol. A and X respectively are ________.
Chloroethane and NaOH
ethanol and H2SO4
2 – chloroethan -1-ol and NaHCO3
ethanol and H2O
15.
Equal volumes of three acid solutions of pH 1,2 and 3 are mixed in a vessel. What will be the H+ ion concentration in the mixture?
3.7 × 10-2
10-6
0.111
none of these
16.
For an exothermic chemical process occurring in 2 steps as
(i) A +B ⟶ X (slow) ;
(ii) X ⟶ AB (fast)
The progress of the reaction can be best described by (x- intermediate).
None of these
17.
All elements except carbon have the tendency to show maximum covalency of six ______
due to presence of vacant d-orbitals
due to absence of vacant d-orbitals
due to presence of partially filled d-orbitals
due to presence of completely filled d-orbitals
18.
The correct statement is_______.
Cu2Cl2 and Ag2S are coloured
Upon strong heating paramagnetic gases are evolved by NaNO3 and AgNO3
Green vitriol and blue vitriol are isomorphous
KMnO4 and K2Cr2O7 are coloured due to
19.
Na[Ag(CN)2] is _________.
Sodium aurocyanide
Sodium meta aluminate
Aluminosilicate
Sodium dicyanoargentate
20.
The oxidation state of the central metal ion in the complex [Co(H2O)(CN)(en)2]2+ is________.
0
+1
+2
+3
21.
For the reaction, 2NH3 ⟶ N2 + 3H2, if \(\frac { -d[NH_{ 3 }] }{ dt } \) = k1[NH3], \(\frac { d[N_{ 2 }] }{ dt } =k_{ 2 }[NH_{ 3 }],\frac { d[{ H }_{ 2 }] }{ dt } \)= k3[NH3] then the relation between k1, k2 and k3 is _________.
k1 = k2 = k3
k1 = 3k2 = 2k3
1.5k1 = 3k2 = k3
2k1 = k2 = 3k3
22.
Which of the following is paramagnetic in nature?
[Zn(NH3)4]2+
[Co(NH3)6]3+
[Ni(H2O)6]2+
[Ni(CN)4]2-
23.
24.
Which of the following is not sp2 hybridised?
Graphite
graphene
Fullerene
dry ice
25.
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Fe
Cu
Mg
Zn
1.
(b)
Natural
2.
(a)
enzymes
3.
(c)
antipyretic
4.
(c)
CH3 - CH2 - CH2 - NH2
5.
(a)
nature of the amino acids
6.
(d)
lactose
7.
(b)
Standard Hydrogen Electrode
8.
(a)
CH3CHO
9.
(c)
Alcohol
10.
(b)
\(K=\frac{α^2C}{1-a}\)
11.
(a)
1
12.
(a)
Riboflavin
13.
- I etiect increases the acidity. If electronegativity is high, - I effect is also high.
14.
15.
pH = -log10 [H+]
∴ [H+] = 10-pH
Let the volume be x ml.
V1M1 +V2M2 +V3M3 = VM
∴ x ml of 10-1 M+ x ml of 10-2 M + x ml of 10-3 M
= 3 x ml of [H+]
\(∴ [H^+] = \frac{ x[0.1 + 0.01 + 0.001]}{3x}\)
\(= \frac{ [0.1 + 0.01 + 0.001]}{3}\)
\(= \frac{ [0.111]}{3}\)
= 0.037
= 3.7 x 10-2
16.
(c)
17.
(a)
due to presence of vacant d-orbitals
18.
(b)
Upon strong heating paramagnetic gases are evolved by NaNO3 and AgNO3
19.
(d)
Sodium dicyanoargentate
20.
(d)
+3
21.
\(Rate=\frac { -1 }{ 2 } \frac { d[NH_3] }{ dt } \)
\(\frac { -d\left[ { N }_{ 2 } \right] }{ dt } =\frac { 1 }{ 3 } \frac { d\left[ { H}_{ 2 } \right] }{ dt } \)
\(=\frac { 1 }{ 2 } { k_1\left[ { NH}_{ 3 } \right] } = { k_2 \left[ { NH}_{ 3 } \right] }=\frac { 1 }{ 3 } { k_3\left[ { NH}_{ 3 } \right] } \)
[3/2] k1 = 3k2 = k3
1.5k1 = 3k2 = k3
22.
a) Zn2+ (d10 ⇒ diamagnetic)
b) Co3+ (d6 Low spain ⇒ t2g6 e0g ; diamagnetic)
c) Ni2+ (d8 Low spain ⇒ t2g6 e2g ; paramagnetic)
d) [Ni(CN)4]2+ (dsp2 ; square planar, diamagnetic)
23.
(b)
24.
(d)
dry ice
25.
(c)
Mg
12th Standard Syllabus & Materials
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