Chemistry Test 218

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Chemistry Test 218

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Weekly Quiz Competition

Question 1
4 / -1

The wavelength associated with a golf ball weighing 200g and moving with a speed of 5 m/h is of the order __

A
10^-10 m

B
10^-20 m

C
10^-30 m

D
10^-40 m

Solution
Question 2
4 / -1

Rutherford's experiment, which established nuclear model of atom, used a beam of

A
α-particles, which impinged on a metal foil and got scattered

B
β-particles, which impinged on a metal foil and got absorbed

C
γ-rays, which impinged on a metal foil and get ejected electrons

D
helium atoms, which impinged on a metal foil and got scattered

Solution

alpha particles are helium atoms stripped off their two electrons.
Question 3
4 / -1

The enthalpy change (∆H) for neutralisation of 1 M HCl by caustic soda in dilute solutions at 298 K is

A
-68 KJ

B
-65 KJ

C
-057.1 KJ

D
-50 KJ

Solution

It's actually factual.The enthalpy of neutralisation for strong acid and strong base per mole is 57.1KJ i.e 0.0571J/mole
Question 4
4 / -1

The CFSE (Crystal Field Stabilisation Energy) for a high spin octahedral complex having d¹ configuration is __

A
− 0.6Δ₀

B
− 0.8Δ₀

C
− 0.4Δ₀

D
0.00

Solution

CFSE = [− 0.4p + 0.6q]Δ₀

= [− 4p + 6q]Dq

p = electrons in e_g orbitals

q = electrons in t_2g orbitals

For d₁ (high spin) configuration t 2 g 1 e g 0

CFSE = [- 0.4 X+ 0.6 X 0]Δ₀

=[−0.40 + 0]Δ₀ = − 0.4 Δ

= 4Dq.
(Configuration of d¹ in high spin or low spin is same).
Question 5
4 / -1

Duma's method involves the determination of content of nitrogen in the organic compound in the form of

A
Gaseous NH₃

B
Gaseous N₂

C
NaCN

D
(NH₄)₂SO₄

Solution

Dumas' method involves the determination of nitrogen content in the organic compound in the form of nitrogen (N₂). Organic compound is oxidized with cupric oxide in an atmosphere of carbon dioxide which gives free nitrogen along-with carbon dioxide and water.
Question 6
4 / -1

Ethanal reacts with alkali to give 3-hydroxybutanal. the reaction is

A
Polymerisation

B
Claisen condensation

C
Aldol condensation

D
Reimer-Tiemann reaction

Solution

Aldol reaction is an important organic reaction of aldehydes and ketones. This reaction is shown by aldehydes and Ketones having alpha-hydrogen atom in the compound. Such a-hydrogen atom containing aldehydes and ketones will undergo self condensation in presence dilute alkalies like dil.NaOH (dilute Sodium hydroxide), dil.Ba(OH)2(dilute Barium hydroxide) forming alpha, β-hydroxyaldehyde (an aldol) or β-hydroxyketone (a Ketol) .The Aldol or the Ketol thus formed in the reaction upon heating eliminates a molecule of water (i.e. it undergoes dehydration) forming alpha, β-unsaturated Aldehydes or Ketones respectively. This reaction now is called Aldol condensation reaction.
Question 7
4 / -1

For the reaction system : 2NO(g) + O₂(g) → 2NO₂(g) volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to O₂ and second order with respect to NO, the rate of reaction will

A
diminish to one-fourth of its initial value

B
diminish to one-eighth of its initial value

C
increase to four times of its initial value

D
increase to eight times of its initial value

Solution
Question 8
4 / -1

The hypothetical complex Diaquatriammine-chloro-cobalt(III) chloride can be represented as

A
[CoCl(NH₃)₃(H₂O)₂]Cl₂

B
[Co(NH₃)₃(H₂O)₂Cl₃]

C
[Co(NH₃)₃(H₂O)₂Cl]

D
[Co(NH₃)₃(H₂O)₃]Cl₃

Solution

Chlorodiaquatriamminecobalt(Ill) chloride can be represented as [CoCl(NH₃)₃(H₂O)₂]Cl₂.
Question 9
4 / -1

Which of the following is isoelectronic with carbon atom?

A
Na⁺

B
Al³⁺

C
O^{2 −}

D
N⁺

Solution

Isoelectronic species: a group of ions, atoms, or molecules that have the same number of electrons. Thus, carbon and N⁺ are isoelectronic with 6 electrons.

Electronic configuration of C and N⁺:
Question 10
4 / -1

The electrochemical equivalent of metal is x gram-coulomb^-1. The equivalent weight of metal is

A
x

B
x * 96500

C
x / 96500

D
1.6 X 10 ^{− 19} X x

Solution

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Chemistry Test 218

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Question 1

10-10 m

10-20 m

10-30 m

10-40 m

Solution

Question 2

α-particles, which impinged on a metal foil and got scattered

β-particles, which impinged on a metal foil and got absorbed

γ-rays, which impinged on a metal foil and get ejected electrons

helium atoms, which impinged on a metal foil and got scattered

Solution

Question 3

-68 KJ

-65 KJ

-057.1 KJ

-50 KJ

Solution

Question 4

− 0.6Δ0

− 0.8Δ0

− 0.4Δ0

0.00

Solution

Question 5

Gaseous NH₃

Gaseous N₂

NaCN

(NH₄)₂SO₄

Solution

Question 6

Polymerisation

Claisen condensation

Aldol condensation

Reimer-Tiemann reaction

Solution

Question 7

diminish to one-fourth of its initial value

diminish to one-eighth of its initial value

increase to four times of its initial value

increase to eight times of its initial value

Solution

Question 8

[CoCl(NH3)3(H2O)2]Cl2

[Co(NH3)3(H2O)2Cl3]

[Co(NH3)3(H2O)2Cl]

[Co(NH3)3(H2O)3]Cl3

Solution

Question 9

Na+

Al3+

O2 −

N+

Solution

Question 10

x

x * 96500

x / 96500

1.6 X 10 − 19 X x

Solution

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10^-10 m

10^-20 m

10^-30 m

10^-40 m

− 0.6Δ₀

− 0.8Δ₀

− 0.4Δ₀

[CoCl(NH₃)₃(H₂O)₂]Cl₂

[Co(NH₃)₃(H₂O)₂Cl₃]

[Co(NH₃)₃(H₂O)₂Cl]

[Co(NH₃)₃(H₂O)₃]Cl₃

Na⁺

Al³⁺

O^{2 −}

N⁺

1.6 X 10 ^{− 19} X x