12th Standard Syllabus & Materials
12th Standard
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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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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions - Part Three
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.
Which one of the following is correctly matched?
Emulsion - Smoke
Gel - butter
foam - Mist
whipped cream - sol
2.
A current strength of 3.86 A was passed through molten Calcium oxide for 41 minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is_______. (atomic mass of Ca is 40g / mol and 1F = 96500C).
4
2
8
6
3.
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively _______.
acidic, acidic, basic
basic, acidic, basic
basic, neutral, basic
none of these
4.
The decomposition of phosphine (PH3) on tungsten at low pressure is a first order reaction. It is because the _____.
rate is proportional to the surface coverage
rate is inversely proportional to the surface coverage
rate is independent of the surface coverage
rate of decomposition is slow
5.
The number of carbon atoms per unit cell of diamond is _______.
8
6
1
4
6.
Crystal field stabilization energy for high spin d5 octahedral complex is _______.
-0.6\({ \Delta }_{ 0 }\)
0
2(P-\({ \Delta }_{ 0 }\))
2(P+\({ \Delta }_{ 0 }\))
7.
Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is _______.
Ti
Cu
Mn
Zn
8.
In the brown ring test, brown colour of the ring is due to _______.
a mixture of No and NO2
Nitroso ferrous sulphate
Ferrous nitrate
Ferric nitrate
9.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
10.
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.
(b)
Gel - butter
2.
mg = ZIt
\(= \frac{40 \times 3.86 \times 2500}{2 \times 96500} = 2g\)
(∵ t = 41 min 40 sec = 2500 seconds & \(Z = \frac{m}{n \times 96500} = \frac{40}{x \times 96500})\)
3.
HCOONa + HOH ⇌ NaOH + H-COOH
strong base weak acid
Basic in nature.
C6H5NH3Cl + HOH ⇌ H3O+ + C6H5 - NH2 + Cl-
acidic
KCN + H - OH ⇌ KOH + HCN
Base strong base weak acid
basic, acidic, basic is correct.
4.
Given:
At low pressure the reaction follows first order therefore,
Rate α [reactant]1
Rate α (surface area)
At high pressure due to the complete coverage of surface area, the reaction follows zero order.
Rate α [reactant]0
Therefore the rate is independent of surface area.
5.
(a)
8
6.
The electronic configuration t2g3, e2g
[ 3 x (-0.4)+ 2(0.6)]Δ0
[-1.2 + 1.2] Δ0 = 0
7.
(a)
Ti
8.
(b)
Nitroso ferrous sulphate
9.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
10.
(d)
Carbon and hydrogen are suitable reducing agents for metal sulphides
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
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