Karnataka CET- 2016(Chemistry)

Question 1 of 52

1. Question

The half-life period of a 1^st order reaction is 60 minutes. What percentage will be left over after 240 minutes?

6.25%
4.25%
5%
6%

Question 2 of 52

2. Question

Which of the following is not a colligative property?

Osmotic pressure
Optical activity
Depression in Freezing point
Elevation in Boiling point

Question 3 of 52

3. Question

The contribution of particle at the edge centre to a particular unit cell is,

1/2
1/4
1
1/8

Question 4 of 52

4. Question

When an electrolyte is dissociated in solution, the van’t Hoff’s factor (i) is,

> 1
< 1
= 0
= 1

Question 5 of 52

5. Question

Which of the following is incorrect in a galvanic cell?

Oxidation occurs at anode
Reduction occurs at cathode
The electrode at which electrons are gained is called cathode
The electrode at which electrons are lost is called cathode

Question 6 of 52

6. Question

A secondary cell is one

Can be recharged
Can be recharged by passing current through it in the same direction
Can be recharged by passing current through it in the opposite direction
Cannot recharged

Question 7 of 52

7. Question

Osmotic pressure of the solution can be increased by,

Increasing the temperature of the solution
Decreasing the temperature of the solution
Increasing the volume of the vessel
Diluting the solution

Question 8 of 52

8. Question

The amount of current in Faraday is required for the reduction of 1 mol of Cr₂O₇⁻⁻ ions to Cr³⁺ is,

1 F
2 F
6 F
4 F

Question 9 of 52

9. Question

For a chemical reaction,
mA → xB, the rate law is r = k[A]²
If the concentration of A is doubled, the reaction rate will be,

Doubled
Quadruplet
Increases by 8 times
Unchanged

Question 10 of 52

10. Question

Schottky defect in a crystal is observed when,

Unequal number of cations and anions are missing from the lattice
Equal number of cations and anions are missing from the lattice
An ion leaves its normal site and occupies an interstitial site
No ion is missing from its lattice site

Question 11 of 52

11. Question

The activation energy of a chemical reaction can be determined by,

Evaluating rate constants at two different temperatures
Changing the concentration of reactants
Evaluating the concentration of reactants at two different temperatures

Question 12 of 52

12. Question

Which of the following statements is incorrect w.r.t. Physisorption?

The forces involved are van der Waal’s forces
More easily liquefiable gases are absorbed easily
Under high pressure it results into Multi-molecular layer on adsorbent surface
∆H_adsorption is low and + Ve

Question 13 of 52

13. Question

Sulphur sol contains

Discrete S-atoms
Discrete S-molecules
Larger aggregates of S-molecules
Water dispersed in Solid Sulphur

Question 14 of 52

14. Question

Reactions in Zeolite catalyst depend on,

Pores
Apertures
Size of cavity
All of the options

Question 15 of 52

15. Question

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions, but Cl of 2,4 – dinitro chlorobenzene is readily replaced. This is because,

−NO₂ group makes the ring electron rich at ortho and para positions
−NO₂ group withdraws electrons from meta position
−NO₂ donate electrons at meta position
−NO₂ withdraws electrons from ortho and para positions

Question 16 of 52

16. Question

Benzene carbaldehyde is reacted with concentrated NaOH solution to give the products A and B. The product A can be used food preservative and the product B is an aromatic hydroxyl compound where OH group is linked to sp³ hybridised carbon atom next to Benzene ring. The product A and B are respectively,

Sodium benzoate and phenol
Sodium benzoate and phenyl methanol
Sodium benzoate and cresol
Sodium benzoate and picric acid

Question 17 of 52

17. Question

The reaction which involves dichlorocarbene as an electrophile is,

Reamer-Tiemann reaction
Kolbe’s reaction
Friedel-Craft’s acylation
Fitting’s reaction

Question 18 of 52

18. Question

Ethanol is converted into ethoxy ethane,

By heating excess of ethanol with conc. H₂SO₄ at 140ºC
By heating Ethanol with excess of conc. H₂SO₄ at 443 K
By treating with conc. H₂SO₄ at room temperature
By treating with conc. H₂SO₄ at 273 K

Question 19 of 52

19. Question

An organic compound X is oxidized by using acidifier K₂Cr₂O₇ The product obtained reacts with phenyl hydrazine bur does not answer silver mirror test. The compound X is,

2-propanol
Ethanal
Ethanol
CH₃CH₂CH₃

Question 20 of 52

20. Question

The number of oxygen atoms in 4.4 gm of CO₂ is,

1.2 × 10²³
6 × 10²²
6 × 10²³
12 × 10²³

Question 21 of 52

21. Question

If the bond energies of H – H, Br – Br, and H – Br are 433, 192 and 364 kJ mol⁻¹ respectively, then ∆Hº for the reaction
H_2(g) + Br_2(g) →2HBr_(g) is

−261 kJ
+103 kJ
+261 kJ
−103 kJ

Question 22 of 52

22. Question

In the reaction; Fe(OH)_3(s) ⇌ Fe³⁺_(aq)+ 3OH⁻ _(aq),if the concentration of OH⁻ ions is decreased by (1/4)times, then the equilibrium concentration of Fe³⁺ will increase by,

8 times
16 times
64 times
4 times

Question 23 of 52

23. Question

The correct statement regarding entropy is,

At absolute zero temperature, entropy of a perfectly crystalline solid is zero
At absolute zero temperature, the entropy of a perfectly crystalline substance is + Ve
At absolute zero temperature, the entropy of all crystalline substances is zero
At 0ºC, the entropy of a perfect crystalline solid is zero

Question 24 of 52

24. Question

Equilibrium constants K₁ and K₂ for the following equilibria

NO_(g)+ 1/2 O_2(g) ⇌ NO_2(g)
2NO_2(g) ⇌ 2NO_(g) + O_2(g)
are related as

K₁ = √(K₂)
K₂ = 1/(K₁)
K₁ - 2 K₂
K₂ = 1/(K₁²)

Question 25 of 52

25. Question

Van-Arkel method of refining Zirconium involves,

Removing all oxygen and nitrogen impurities
Removing CO impurity
Removing Hydrogen impurity
Removing silica impurity

Question 26 of 52

26. Question

The composition of ‘copper matte’ is,

Cu₂S + FeS
Cu₂S + Cu₂O
Cu₂S + FeO
Cu₂O +FeS

Question 27 of 52

27. Question

The complex formed when Al₂O₃ is leached from Bauxite using concentrated NaOH solution is,

Na[Al(OH)₄]
NaAl₂O₄
Na₂[Al(OH)₃]
Na₂AlO₂

Question 28 of 52

28. Question

The property which is not true about Fluorine is,

Most of its reactions are exothermic
It forms only one oxo acid
Highest electronegativity
High F – F bond dissociation enthalpy

Question 29 of 52

29. Question

Which is true regarding nitrogen?

Less electronegative
Has low ionization enthalpy
d-orbitals are available
Ability to form pπ – pπ bonds with itself

Question 30 of 52

30. Question

The shape of XeF₆ is,

Square planar
Distorted octahedral
Square pyrimidal
Pyramidal

Question 31 of 52

31. Question

The number of isomers possible for the octahedral complex [CoCl₂(en)(NH₃)₂]⁺is,

Two
Three
No isomer
Four isomers

Question 32 of 52

32. Question

CO is a stronger ligand than Cl, because

CO is a neutral molecule
CO has π-bonds
CO is poisonous
CO is more reactive

Question 33 of 52

33. Question

The bivalent metal ion having maximum paramagnetic behavior among the first transition series elements is,

Mn²⁺
Cu²⁺
Sc²⁺
Cu⁺

Question 34 of 52

34. Question

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) take in excess reacts with NH₃ to give an explosive compound (C)
The compounds A, B and C are

A = MnO₂, B = Cl₂, C = NCl₃
A = MnO, B = Cl₂, C = NH₄Cl
A = Mn₃O₄, B = Cl₂, C = NCl₃
A = MnO₃, B = Cl₂, C = NCl₂

Question 35 of 52

35. Question

Mn²⁺ compounds are more stable than Fe²⁺ compounds towards oxidation to their +3 state, because

Mn²⁺ is more stable with high 3^rd ionization energy
Mn²⁺ is bigger in size
Mn²⁺ has completely filled d-orbitals
Mn²⁺ does not exist

Question 36 of 52

36. Question

Which of the following sequence is correct regarding field strength of ligands as per spectrochemical series?

SCN⁻ < F⁻ < CN⁻ < CO
F⁻ < SCN⁻ < CN⁻ CO
CN⁻ < F⁻ < CO < SCN⁻
SCN⁻ < CO < F⁻ < CN⁻

Question 37 of 52

37. Question

An organic compound A on reduction gives compound B, which on reaction with trichloro methane and caustic potash forms C. The compound ‘C’ on catalytic reduction gives N-methyl benzenamine, the compound ‘A’ is,

Nitrobenzene
Nitromethane
Methanamine
Benzenamine

Question 38 of 52

38. Question

Which of the following gives positive Fehling’s solution test?

Sucrose
Glucose
Fats
Protein

Question 39 of 52

39. Question

A liquid can exist only,

Between triple point and critical point
At any temperature above melting point
Between melting point and critical point
Between boiling and melting points

Question 40 of 52

40. Question

The energy of electron in the n^th Bohr orbit of H-atom is

(-13.6)/n² eV
(-13.6)/n eV
(-13.6)/n⁴ eV
(-13.6)/n³ eV

Question 41 of 52

41. Question

Consider the following sets of quantum numbers
Which of the below setting is not permissible arrangement of electrons in an atom?

n - 4 , l - 0 , m - 0 , s - (-1/2)
n - 5 , l - 3 , m - 0 , s - (+1/2)
n - 3 , l - 2 , m - (-2) , s - (-1/2)
n - 3 , l - 2 , m - (-3) , s - (+1/2)

Question 42 of 52

42. Question

The increasing order of bond order of O₂, O₂⁺, O₂^– and O₂^— is

O₂⁺, O₂, O₂^-, O₂^--
O₂^--, O₂^-, O₂⁺, O₂
O₂, O₂⁺, O₂^- , O₂^--
O₂^--, O₂^-, O₂, O₂⁺

Question 43 of 52

43. Question

HCl gas is covalent and NaCl is an ionic compound. This is because

Sodium is highly electro + Ve
Hydrogen is a non-metal
HCl is a gas
Electronegativity difference between H and Cl is less than 2.1

Question 44 of 52

44. Question

Which of the following is a polyamide?

Nylon-6, 6
Terylene
Polythene
Buna-S

Question 45 of 52

45. Question

Which of the following is correct about H-bonding in DNA?

A – T, G – C
A – G, T – C
G – T, A – C
A – A, T – T

Question 46 of 52

46. Question

Which of the following is employed as Tranquilizer?

Equanil
Naproxen
Tetracyclin
Dettol

Question 47 of 52

47. Question

Reactivity of order of halides for dehydrohalogenation is

R – F > R – Cl > R – Br > R – I
R – I > R – Br > R – Cl > R – F
R – I > R – Cl > R – Br > R – F
R – F > R – I > R – Br > R – Cl

Question 48 of 52

48. Question

Main axis of diatomic molecule is Z. The orbital P_x and P_y overlap to form

π – molecular orbital
σ – molecular orbital
δ – molecular orbital

Question 49 of 52

49. Question

The hybridization of C in diamond, graphite and ethyne is in the order

sp³, sp, sp²
sp³, sp², sp
sp, sp², sp³
sp², sp³, sp

Question 50 of 52

50. Question

A miscible mixture of C₆H₆ + CHCl₃ can be separated by

Sublimation
Distillation
Filtration
Crystallization

Question 51 of 52

51. Question

An organic compound contains C = 40%, H = 13.33% and N = 46.67%. Its emperical formula is

C₂H₂N
C₃H₇N
CH₄N
CHN

Question 52 of 52

52. Question

Electrophile that participates in nitration of benzene is

NO⁺
NO₂⁺
NO
NO₃^-

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