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12th Standard Chemistry English Medium Sample 1 Mark Book Back Questions (New Syllabus) 2020 Set A

Published on: 25/08/2020

Question Set A

12th Standard Chemistry English Medium Sample 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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Std: 12th Standard - Chemistry

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Questions:

Multiple Choice Question

28 x 1 = 28

Saccharin, an artificial sweetener is manufactured from ____________.

(a)

cellulose

(b)

toluene

(c)

cyclohexene

(d)

starch

Which of the following are epimers?

(a)

D(+)-Glucose and D(+)-Galactose

(b)

D(+)-Glucose and D(+)-Mannose

(c)

Neither (a) nor (b)

(d)

Both (a) and (b)

The central dogma of molecular genetics states that the genetic information flows from______.

(a)

Amino acids Protein DNA

(b)

DNA Carbohydrates Proteins

(c)

DNA RNA Proteins

(d)

DNA RNA Carbohydrates

Which one of the following will not undergo Hofmann bromamide reaction.

(a)

CH₃CONHCH₃

(b)

CH₃CH₂CONH₂

(c)

CH₃CONH₂

(d)

C₆H₅CONH₂

Which of the following represents the correct order of acidity in the given compounds

(a)

FCH₂COOH > CH₃COOH > BrCH₂COOH > ClCH₂COOH

(b)

FCH₂COOH > ClCH₂COOH > BrCH₂COOH > CH₃COOH

(c)

CH₃COOH > ClCH₂COOH > FCH₂COOH > Br-CH₂COOH

(d)

Cl CH₂COOH > CH₃COOH > BrCH₂COOH > ICH₂COOH

Among the following ethers which one will produce methyl alcohol on treatment with hot HI?

(a)

(H₃C)₃C-O-CH₃

(b)

(CH₃-)₂-CH-CH₂-O-CH₃

(c)

CH₃-(CH₂)₃-O-CH₃

(d)

CH₃-CH₂-\(\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } \)-O-CH₃

on treatment with Con H₂SO₄, predominately gives______.

(a)

(b)

(c)

(d)

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
(I) (NaCl) = 52
(II) ((BaCl₂) = 0.69
(III) (MgSO₄) = 0.22
The correct order of their coagulating power is ________.

(a)

III > II > I

(b)

I > II > III

(c)

I > III > II

(d)

II > III > I

Statement : To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

(a)

It is not true, ferric chloride is a poison.

(b)

It is true, Fe³⁺ ions coagulate blood which is a negatively charged sol

(c)

It is not true; ferric chloride is ionic and gets into the blood stream.

(d)

It is true, coagulation takes place because of formation of negatively charged sol with Cl^-.

10.

A certain current liberated 0.504gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ______.

(a)

31.75

(b)

15.8

(c)

7.5

(d)

63.5

11.

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because _______.

(a)

Zinc is lighter than iron

(b)

Zinc has lower melting point than iron

(c)

Zinc has lower negative electrode potential than iron

(d)

Zinc has higher negative electrode potential than iron

12.

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______.

(a)

2.88 S cm²mol^-1

(b)

11.52 S cm²mol^-1

(c)

0.086 S cm²mol^-1

(d)

28.8 S cm²mol^-1

13.

Which of the following can act as Lowery – Bronsted acid well as base?

(a)

HCl

(b)

SO₄²⁻

(c)

HPO₄²⁻

(d)

Br^-

14.

Using Gibb’s free energy change, ∆G^o=57.34 kJ mol^-1, for the reaction, X₂Y_(s)⇌2X⁺+Y^2-(aq), calculate the solubility product of X₂Y in water at 300 K_______. (R = 8.3 J K^-1Mol^-1)

(a)

10^-10

(b)

10^-12

(c)

10^-14

(d)

can not be calculated from the given dat

15.

pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K_sp) of Ca(OH)₂ _______.

(a)

0.5 × 10^-15

(b)

0.25 × 10^-10

(c)

0.125 × 10^-15

(d)

0.5 × 10^-10

16.

In a homogeneous reaction A⟶B+C+D, the initial pressure was P₀ and after time t it was P expression for rate constant in terms of P₀, P and t will be _____.

(a)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-P } \right) \)

(b)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { { 2P }_{ 0 } }{ { P }_{ 0 }-P } \right) \)

(c)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 3{ P }_{ 0 }-P }{ 2P_{ 0 } } \right) \)

(d)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-2P } \right) \)

17.

The addition of a catalyst during a chemical reaction alters which of the following quantities?

(a)

Enthalpy

(b)

Activation energy

(c)

Entropy

(d)

Internal energy

18.

The vacant space in bcc lattice unit cell is ________.

(a)

48%

(b)

23%

(c)

32%

(d)

26%

19.

Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is _______.

(a)

(b)

(c)

(d)

both (b) and (c)

20.

Solid CO₂ is an example of ________.

(a)

Covalent solid

(b)

metallic solid

(c)

molecular solid

(d)

ionic solid

21.

Choose the correct statement.

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)₄]^2- is BM and it has square planar structure.

(c)

Crystal field splitting energy \(\left( { \Delta }_{ 0 } \right) \) [FeF₆]^4- is higher than the \((\Delta _{ 0 })\) of [Fe(CN)₆]^4-

(d)

crystal field stabilization energy of [V(H₂O)₆]²⁺ is higher than the crystal field stabilization of [Ti(H₂O)₆]²⁺

22.

A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

(a)

[M(H₂O)₄Cl]SO₄.2H₂O

(b)

[M(H₂O)₆]SO₄

(c)

[M(H₂O)₅Cl]SO₄.H₂O

(d)

[M(H₂O)₃Cl]SO₄.3H₂O

23.

Which of the following lanthanoid ions is diamagnetic?

(a)

Eu²⁺

(b)

Yb²⁺

(c)

Ce²⁺

(d)

Sm²⁺

24.

Which of the following compounds is colourless?

(a)

Fe³⁺

(b)

Ti⁴⁺

(c)

Co²⁺

(d)

Ni²⁺

25.

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

(a)

Br₂ > I₂ > F₂ > Cl₂

(b)

F₂ > Cl₂ > Br₂ > l₂

(c)

I₂ > Br₂ > Cl₂ > F₂

(d)

Cl₂ > Br₂ > F₂ > I₂

26.

On hydrolysis, PCl₃ gives________.

(a)

H₃PO₃

(b)

PH₃

(c)

H₃PO₄

(d)

POCl₃

27.

Oxidation state of carbon in its hydrides _______.

(a)

(b)

-4

(c)

(d)

28.

Which of the metal is extracted by Hall-Heroult process?

(a)

(b)

(c)

(d)

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Answers Key:

Multiple Choice Question

28 x 1 = 28

(b)
toluene

(d)
Both (a) and (b)

(a)
CH₃CONHCH₃

- I etiect increases the acidity. If electronegativity is high, - I effect is also high.

According to Saytzeff rule.

coagulating power ∝ 1/coagulation value

(b)
It is true, Fe³⁺ ions coagulate blood which is a negatively charged sol

10.

\(\frac{m_{1}}{m_{2}} = \frac{E_{1}}{E_{2}} \)
\(\frac{0.504}{m_{2}} = \frac{1.008}{31.77} \)
m₂ = 15.885 g

11.

E^o_Zn²⁺[Zn]= 0.76V and E^o_Fe²⁺[Fe]= -0.44V
Zinc has higher negative electrode potential than iron, iron cannot be coated on zinc

12.

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

13.

HPO₄²⁻ can have the ability to accept a proton to form H₂PO₄^-
It can also have the ability to donate a proton to form PO₄^-3

14.

(a)
10^-10

15.

Ca(OH)₂ ⇌ Ca²⁺ + 2OH^-
Given that pH = 9
pOH = 14 - 9 = 5
[pOH = - log₁₀ [OH]]
[OH^-] = 10^[pOH]
[OH] = 10^-5 M
Ksp = [Ca²⁺] [OH^-]
= 10^-5/2 x (10^-5)² = 0.5 x 10^-15

16.

	A	⟶	B	C	D
Initial rate (M s^-1)	a		0	0	0
Reaction number	x	-	-	-	-
After time t	(a - x)		x	x	x
Total number of moles	= (a + 2x)

17.

A catalyst provides a new path to the reaction with low activation energy. i.e., it lowers the activation energy.

18.

Packing efficiency = 68%
\(\therefore\)empty space percentage = 100 - 68 = 32%

19.

\(k=A{ e }^{ -\left( \frac { { E }_{ a } }{ RT } \right) }\)
In k = In A - \({ \left( \frac { { E }_{ a } }{ R } \right) }\) \(\left( \frac { 1 }{ T } \right) \)
This equation is of the form of a straight line y = mx+c
A plot of In k Vs \(\left( \frac { 1 }{ T } \right) \) gives a straight line with a negative slope.

20.

Lattice points are occupied by CO₂ molecules

21.

(d)
crystal field stabilization energy of [V(H₂O)₆]²⁺ is higher than the crystal field stabilization of [Ti(H₂O)₆]²⁺

22.

Molecular formula: MSO₄Cl.6H₂O
Formation of white precipitate with Barium chloride indicates that SO^2-₄ ions are outside the coordination sphere, and no precipitate with AgNO₃ solution indicates that the Cl^- ions are inside the coordination sphere. Since the coordination number of M is 6.Cl^- and 5 H₂O are ligands, remaining 1 H₂O molecular and SO^2-₄ are in the outer coordination sphere.