Mix Test

Result

Mix Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following pairs will form the most stable ionic bond?

A
F and Cl

B
Li and F

C
Mg and F

D
Na and F

Solution

Here, Na and F have large difference in electronegativities so they from ionic bond.
Question 2
1 / -0

The correct order of the O – O bond length in O₂, H₂O₂ and O₃ is

A
O₂ > O₃ > H₂O₂

B
O₃ > H₂O₂ > O₂

C
H₂O₂ > O₃ > O₂

D
O₂ > H₂O₂ > O₃

Solution
Question 3
1 / -0

Which of the following particles cannot exist?

A

B

C

D

Solution

Atomic number of nitrogen = 7
Question 4
1 / -0

Which of the following forms zig-zag like structure of threads in solid and liquid state?

A
HF

B
HCl

C
HBr

D
HI

Solution
Question 5
1 / -0

Which of the following have maximum number of unpaired electrons?

A
Fe³⁺

B
Fe²⁺

C
Co²⁺

D
Co³⁺

Solution
Question 6
1 / -0

The mass of H₂O₂ that is completely oxidised with 31.2 g of KMnO₄ (molar mass = 158 g mol^–1) in acidic medium is

A
12 g

B
15 g

C
17 g

D
1 g

Solution

The reaction is 2KMnO₄ + 5H₂O₂ + 6H⁺ 2Mn²⁺ + 5O₂ + 8H₂O + 2K⁺.2 ×158 g of KMnO₄ reacts completely with 5 × 34 g of H₂O₂.
31.2 g of KMnO₄ reacts completely with H₂O₂ = .
Question 7
1 / -0

The temperature at which root mean square speed of helium becomes equal to that of methane at 327°C is

A
150°C

B
0°C

C
– 93°C

D
– 123°C

Solution
Question 8
1 / -0

The reaction of cyanamide, NH₂CN(s), with oxygen was run in a bomb calorimeter and at 300 K was found to be – 743 kJ mol^–1. The value of at 300 K for the combustion reaction NH₂CN(s) + O₂(g) N₂(g) + CO₂(g) + H₂O(l) would be

A
– 741.75 kJ mol^–1

B
– 743 kJ mol^–1

C
– 744.25 kJ mol^–1

D
– 740.5 kJ mol^–1

Solution
Question 9
1 / -0

Which of the following orders regarding acidic strength in an aqueous solution is correct?

A
HCN < CH₃COOH < HCI < HCIO₄

B
HCN < CH₃COOH < HClO₄ < HCI

C
HCN < HCIO₄ < HCI < CH₃COOH

D
HCIO₄ < CH₃COOH < HCI < HCN

Solution

HCN is the weakest acid. The next stronger acid is CH₃COOH. Out of HCI and HCIO₄, the former is a weaker acid.
Question 10
1 / -0

The correct sequence of hybridisation of methane, ethene and acetylene is

A
sp, sp², sp³

B
sp², sp³, sp

C
sp³, sp², sp

D
sp³, sp, sp²

Solution

The first bond between any two atoms is sigma and rest are pi bonds. The pi bond is formed by sideways overlapping of unhybridised p-orbital.
Question 11
1 / -0

The brown haze of photochemical smog is largely attributed to

A
CO

B
NO₂

C
SO₂

D
HCl

Solution

The brown haze of photochemical smog is largely attributed to NO₂.It is a reddish brown gas, owing to the presence of an unpaired electron.

Question 12

1 / -0

Match the following:

Group - I	Group - II
P. B	1. Construction materials
Q. Al	2. Semiconductors
R. Ga	3. Fibreglass production
S. In	4. LED lighting

P - 3, Q - 1, R - 4, S - 2

P - 2, Q - 1, R - 4, S - 3

P - 3, Q - 4, R - 1, S - 2

P - 4, Q - 2, R - 3, S - 1

Solution

The correct sequence of codes is P - 3, Q - 1, R - 4, S – 2.

Group - I	Group - II
P. B	3. Fibreglass production
Q. Al	1. Construction materials
R. Ga	4. LED lighting
S. In	2. Semiconductors

Question 13
1 / -0

The plot of log k versus 1/T is linear with a slope of

A
– E_a/R

B
E_a/R

C
– E_a/2.303 R

D
E_a/2.303 R

Solution

Arrhenius equation in the logarithm form is
ln k = ln A - or
Question 14
1 / -0

_{^{Consider the reaction between potassium permanganate and a metal sulphite represented as follows.}}

Which of the following options about the process is correct?

A
1 mole of potassium permanganate oxidises 5 moles of the metal sulphite.

B
There is a net transfer of 5 electrons in the reaction.

C
20 mL of 0.5M KMnO₄ solution can neutralise 10 mL of 0.25 M metal sulphite.

D
50 mL of KMnO₄ can oxidise a 20 mL equimolar solution of the metal sulphite.

Solution

Only option (3) is correct.

Using m.Eq = M v N-factor

The balanced equation shows that 1 mole of potassium permanganate will oxidise 2.5 moles of the metal sulphite.

There is a net transfer of 10 electrons during the complete reaction.

Only 8 mL of KMnO₄ solution would be required to neutralise a 20 mL equimolar solution of metal sulphite.
Question 15
1 / -0

Which of the following options will replace the question mark (?) in the given reaction?

CHCH + CH₃OH CH₃O - CH = CH₂

A
KOH/150^oC - 160^oC

B
NH₄OH/80^oC

C
Concentrated H₂SO₄/160^oC

D
Anhydrous ZnCl₂/150^oC

Solution

The vinylation of alcohol is accomplished at 150^oC - 160^oC by using nitrogen diluted acetylene at a pressure of 100 pounds. This process is done in the presence of 1 - 2% strong base, such as KOH, to form alkoxide of alcohol. This is a nucleophilic substitution reaction. The mechanism of the given reaction is as follows.

ROH + KOH RO^-K⁺ + H₂O

RO^- + CHCH ROCH=CH^-

ROCH=CH^- + ROH ROCH=CH₂ + RO^-