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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Eight
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.
Questions + Answers key
Take MCQ Chemistry Test
1.
Potassium meta bisulphite is used as ________
food preservative
sweetening agent
a cosmetic
an antioxidant
2.
The drug that binds to the receptor site and inhibits its natural function are called _______
anomers
agonists
antagonists
none of the above
3.
Nylon -66 is an example of ______ polymer.
addition
condensation
both (a) and (b)
natural
4.
Which of the following compounds has the smell of bitter almonds?
aniline
nitro methane
benzene sulphonic acid
nitrobenzene
5.
The precipitation of protein is called_______
peptisation
denaturation
renaturation
none of these
6.
A dipeptide does not have
two peptide units
portions of two amino acids
an amino group
salt like structure
7.
The emf of a cell with 1 M solution of reactants and products in solution at 25°C is called ______.
Half cell potential
Standard emf
Single electrode potential
Redox potential
8.
Ozonolysis of terminal alkenes gives _________ as one of the products.
acetone
acetaldehyde
water
formaldehyde
9.
Argyrol is_______.
colloidal silver
colloidal antimony
colloidal gold
milk of magnesia
10.
Isomerism exhibited by ethylene glycol is ________.
position isomerism
chain isomerism
functional isomerism
both (a) and (c)
11.
is an example of ________.
Simple
mixed
aliphatic
both (a) and (c)
12.
The polymer used in making blankets (artificial wool) is _______.
polystyrene
PAN
polyester
polythene
13.
Among the following L- serine is ______.
14.
Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } \) C 'C' is ______.
anilinium chloride
O – nitro aniline
benzene diazonium chloride
m– nitro benzoic acid
15.
In the electrochemical cell: Zn|ZnSO4 (0.01M)|| CuSO4 (1.0M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that CuSO4 changed to 0.01M, the emf changes to E2. From the above, which one is the relationship between E1 and E2?
E1 < E2
E1 > E2
E2 ≥ E1
E1 = E2
16.
The solubility of BaSO4 in water is 2.42 × 10-3gL-1 at 298K. The value of its solubility product(Ksp) will be (Given molar mass of BaSO4 =233g mol-1)
1.08 × 10-14mol2L-2
1.08 × 10-12mol2L-2
1.08 × 10-10mol2L-2
1.08 × 10-8mol2L-2
17.
For a reaction, Ea = 0 and k = 4.2 x 105 sec-1 at 300 K, the value of kat 310 K will be _______.
4.2 x 105 sec-1
8.4 x 105 sec-1
8.4 x 105 sec-1
unpredictable
18.
Group 14 elements have general electronic configuration _______.
ns2
ns2np4
ns2np6
ns2np2
19.
The structure of hexaaquatitanium (III) ion is _______.
[Ti(H2O)6]3+
[Ti(H2O)6]3-
[Ti(H2O)5]H2O
[Ti(H2O)6]
20.
The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as _______.
[Co(NH3)3(H2O)2Cl]Cl2
[Co(NH)3(H2O)Cl3]
[Co(NH2)3(H2O)2Cl]
[Co(NH3)3(H2O)3]Cl3
21.
For a first order reaction A ⟶ product with initial concentration x mol L-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L-1 the half life is
(2.5 x 2) hours
\(\left( \frac { 2.5 }{ 2 } \right) \) hours
2.5 hours
Without knowing the rate constant, t1/2 cannot be determined from the given data
22.
The number of carbon atoms per unit cell of diamond is _______.
8
6
1
4
23.
The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.
their magnetic behaviour
their unfilled d orbitals
their ability to adopt variable oxidation states
their chemical reactivity
24.
Oxidation state of carbon in its hydrides _______.
+4
-4
+3
+2
25.
Electrochemical process is used to extract_______.
Iron
Lead
Sodium
silver
1.
(a)
food preservative
2.
(c)
antagonists
3.
(b)
condensation
4.
(d)
nitrobenzene
5.
(d)
none of these
6.
(a)
two peptide units
7.
(b)
Standard emf
8.
(d)
formaldehyde
9.
(a)
colloidal silver
10.
(c)
functional isomerism
11.
(b)
mixed
12.
(b)
PAN
13.
(c)
14.
15.
Ecell = Eocell - \(\frac{0.0591}{2} \log [\frac{Zn^{2+}}{Cu^{2+}}]\)
El = Eocell - \(\frac{0.0591}{2} \log [\frac{10^{-2}}{1}]\)
El = Eocell + 0.0591 ...(1)
E2 = Eocell - \(\frac{0.0591}{2} \log [\frac{1}{10^{-2}}]\)
E2 = Eocell - 0.0591 ...(2)
E1 > E2
Zn(s)| ⟶ Zn2+(aq) + 2e-
Cu2+(aq) + 2e- ⟶ Cu(s)
Zn(s) + Cu2+(aq) ⟶ Zn2+(aq) + Cu(s)
16.
BaSO4 ⇌ Ba2+ + SO42-
Ksp = (s) (s)
Ksp = (s)2
= (2.42 × 10-3gL-1)2
\(=\frac{2.42 \times 10^{-3} gL^{-1}}{233 \text{ g mol}^{-1}}\)
= (0.01038 x 10-3)2
= (1.038 x x 10-5)2
= 1.077 x 10-10
= 1.08 × 10-10mol2L-2
17.
(a)
4.2 x 105 sec-1
18.
(d)
ns2np2
19.
(a)
[Ti(H2O)6]3+
20.
(a)
[Co(NH3)3(H2O)2Cl]Cl2
21.
For a first order reaction
t1/2 = \(\frac { 0.693 }{ { k }}\)
t1/2 does not depend on the initial concentration and it remains constant (whatever may be the initial concentration)
t1/2 = 2.5 hrs
22.
(a)
8
23.
(c)
their ability to adopt variable oxidation states
24.
(a)
+4
25.
(c)
Sodium
12th Standard Syllabus & Materials
12th Standard
TN 12th Tamil அருமை உடைய செயல் - செய்யுள்-தேவாரம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Tamil அருமை உடைய செயல் - செய்யுள்-பெருமாள் திருமொழி Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Tamil அருமை உடைய செயல் - செய்யுள்-தெய்வமணிமாலை * Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Tamil நாகரிகம், தொழில், வணிகம், ஆளுமை - உரைநடை உலகம் -திரைமொழி Sample Question Papers Study Material - QB365 Set A
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