Chemistry Test 74

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Chemistry Test 74

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Weekly Quiz Competition

Question 1
4 / -1

The set of ions which has same magnetic moment is :-

A
Co⁺², Cr⁺³, V⁺³

B
Mn⁺², Fe⁺³, Cr⁺

C
Ni⁺², Mn⁺², Co⁺²

D
Fe⁺², Mn⁺², Co⁺²

Solution

Mn⁺², Fe⁺³, Cr⁺ (They all have 5 unpaired e^–)
Question 2
4 / -1

The correct order of increasing radius is :-

A
Be⁺², Mg⁺², Na⁺

B
K⁺, Ca⁺², S^–2

C
O^–2, F^–, N^–3

D
S^–2, O^–2, As^–3

Solution

Correct order of radius

Be⁺² < Mg⁺² < Na⁺

Ca⁺² < K⁺ < S^–2

F^– < O^–2 < N^–3

O^–2 < S^–2 < As^–3
Question 3
4 / -1

Which of the following is not a set of isoelectronic species ?

A
Ar, K⁺, Ca⁺²

B
Cl^–, Ne, O^–2

C
CO, CN^–, O₂⁺²

D
CH₄, NH₃, H₂O

Solution

Cl^–(18e^–)

Ne and O^–2 (10e^–)

They are not isoelectronic
Question 4
4 / -1

For which species, energy required to separate an electron will be maximum ?

A
Na⁺

B
Mg⁺²

C
Al⁺²

D
Al⁺³

Solution

IE ∝ Z_eff
order of IE :- Na⁺ < Mg⁺² < Al⁺² < Al⁺³
Question 5
4 / -1

The IP₁, IP₂, IP₃, IP₄ and IP₅ of an element are 7.1, 14.3, 34.5, 46.8 and 162.2 eV respectively. The element is likely to be :-

A
Na

B
Si

C
F

D
Ca

Solution

The biggest jump occurs from IP₄ and IP₅ hence, velence e^– = 4 (It belongs to 'c' family)
Question 6
4 / -1

In which of the following process energy is liberated ?

A
Cl → Cl⁺ + e^–

B
HCl → H⁺ + Cl^–

C
Cl + e^– → Cl^–

D
O^– + e^– → O^–2

Solution

Cl + e^– → Cl^– (This is EA process of Cl)

This process is exothermic
Question 7
4 / -1

For electron affinity of halogens, which of the following is correct ?

A
Br > F

B
F > Cl

C
Br > Cl

D
F > I

Solution

Order of EA :- Cl > F > Br > I
Question 8
4 / -1

An element belongs to group III(A) and 3^rd period of the periodic table. Which of the following properties will be shown by the element ?

A
Element forms acidic oxide

B
Solid, non-metallic

C
Liquid, metallic

D
Good conductor of electricity

Solution

That element is Al.

Al₂O₃ is an amphoteric oxide.

Al is solid but metallic.
Question 9
4 / -1

Among the following oxides, which is least acidic?

A
Al₂O₃

B
B₂O₃

C
CO₂

D
NO₂
Question 10
4 / -1

Correct order of acidic strength is :-

A
SiH₄ > PH₃ > CH₄ > HCl

B
HCl > PH₃ > CH₄ > SiH₄

C
HCl > SiH₄ > PH₃ > CH₄

D
HCl > PH₃ >SiH₄ > CH₄

Solution

Order in periodic table,

C

Si P Cl

(In covalent hydrides, acidic strength increases from left to right along a period as well as down the group)

order of acidic strength

CH₄ < SiH₄ < PH₃ < HCl

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Re-Attempt Weekly Quiz Competition

Chemistry Test 74

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Chemistry Test 74

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SHARING IS CARING

Question 1

Co+2, Cr+3, V+3

Mn+2, Fe+3, Cr+

Ni+2, Mn+2, Co+2

Fe+2, Mn+2, Co+2

Solution

Question 2

Be+2, Mg+2, Na+

K+, Ca+2, S–2

O–2, F–, N–3

S–2, O–2, As–3

Solution

Question 3

Ar, K+, Ca+2

Cl–, Ne, O–2

CO, CN–, O2+2

CH4, NH3, H2O

Solution

Question 4

Na+

Mg+2

Al+2

Al+3

Solution

Question 5

Na

Si

F

Ca

Solution

Question 6

Cl → Cl+ + e–

HCl → H+ + Cl–

Cl + e– → Cl–

O– + e– → O–2

Solution

Question 7

Br > F

F > Cl

Br > Cl

F > I

Solution

Question 8

Element forms acidic oxide

Solid, non-metallic

Liquid, metallic

Good conductor of electricity

Solution

Question 9

Al2O3

B2O3

CO2

NO2

Question 10

SiH4 > PH3 > CH4 > HCl

HCl > PH3 > CH4 > SiH4

HCl > SiH4 > PH3 > CH4

HCl > PH3 >SiH4 > CH4

Solution

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Co⁺², Cr⁺³, V⁺³

Mn⁺², Fe⁺³, Cr⁺

Ni⁺², Mn⁺², Co⁺²

Fe⁺², Mn⁺², Co⁺²

Be⁺², Mg⁺², Na⁺

K⁺, Ca⁺², S^–2

O^–2, F^–, N^–3

S^–2, O^–2, As^–3

Ar, K⁺, Ca⁺²

Cl^–, Ne, O^–2

CO, CN^–, O₂⁺²

CH₄, NH₃, H₂O

Na⁺

Mg⁺²

Al⁺²

Al⁺³

Cl → Cl⁺ + e^–

HCl → H⁺ + Cl^–

Cl + e^– → Cl^–

O^– + e^– → O^–2

Al₂O₃

B₂O₃

CO₂

NO₂

SiH₄ > PH₃ > CH₄ > HCl

HCl > PH₃ > CH₄ > SiH₄

HCl > SiH₄ > PH₃ > CH₄

HCl > PH₃ >SiH₄ > CH₄