Mix Test

Result

Mix Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

The disintegration constant of radium with half-life of 1600 years is

A
2.12 10^-4 year^-1

B
4.33 10^-4 year^-1

C
3.26 10^-3 year^-1

D
4.33 10^-12 year^-1

Solution
Question 2
1 / -0

Which of the following compounds is used in the preparation of nylon-66?

A
-caprolactum

B
Hexamethylene diamine and adipic acid

C
Dimethyl terphthalate

D
Hexamethylene diamine

Solution

(i) -caprolactum is monomer of nylon 6 (or perlon)
(ii) Hexamethylene diamine and sebacic acid are monomers of nylon 610.
(iii) Nylon 66 is polymer of adipic acid and hexamethylene diamine.
Question 3
1 / -0

Which of the following statements is not correct?

A
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the state of hybridisation of nickel.

B
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- have the same magnetic properties.

C
The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in their geometry.

D
Nickel ion has same secondary valency in the complexes [NiCl₄]^2- and [Ni(CN)₄]^2-.

E

Solution

Both complexes will have different magnetic properties as crystal field splitting is different in both cases because Cl^- is weak field ligand while CN^- is a strong field ligand.

It is a paramagnetic complex.

It is a diamagnetic complex.
Question 4
1 / -0

In Williamson's synthesis, ethoxyethane is prepared by

A
passing ethanol over heated alumina

B
heating sodium ethoxide with ethyl bromide

C
treating ethyl alcohol with excess of H₂SO₄ at 430-440 K

D
heating ethanol with dry Ag₂O

Solution

Although all of the above reactions would yield ether as a product; however, option (2) represents the process of Williamson synthesis which is an organic reaction used to convert an alcohol and an alkyl halide to an ether using a base such as NaOH. In this reaction, a base abstracting the proton from the alcohol to form an alkoxide intermediate. The alkoxide then attacks the alkyl halide in a nucleophilic substitution reaction (S_N^₂), which results in the formation of the ether and metal halide by-product.
Question 5
1 / -0

For synthesis of 1-butene, CH₃MgI should be treated with

A
propene

B
2-chloropropene

C
allyl chloride

D
ethyl chloride

Solution

Alkenes can be prepared by the reaction of Grignard reagent with unsaturated alkyl halides.
Question 6
1 / -0

The density of a gas at 27°C and 1 atm pressure is . If the pressure remains constant, then the temperature at which the density is 0.5 is

A
200 K

B
400 K

C
600 K

D
800 K

Solution
Question 7
1 / -0

An ideal gas undergoes expansion as shown in the following diagram:

Which of the following relations is correct?

A
P₂ > P₃

B
P₂ < P₃

C
P₂ = P₃

D
2P₂ = P₃

Solution

In adiabatic expansion, the temperature of the gas decreases. While in isothermal expansion, the temperature remains constant. Since P T, Therefore, P₂ > P₃.
Question 8
1 / -0

for a forward reaction in the process A + B ⇌ C is -ve.

What is the sign of in case of a backward reaction?

A
-ve

B
+ve

C
Zero

D
None of these

Solution

A reversible reaction is spontaneous in both directions and hene, is -ve for both the forward as well as backward reaction.
Question 9
1 / -0

For the reaction: H₂(g) + I₂(g) ⇌ 2HI(g), the equilibrium constants expressed in terms of concentration K_c and partial pressure K_p are related as

A
K_p = K_c(RT)²

B
K_p = K_c(RT)^-2

C
K_p = K_c

D
K_c = K_p(RT)

Solution

For the reaction
H₂(g) + I₂(g) ⇌ 2HI(g)
K_p = K_c (RT)^Δn
Δn = 2 - 2 = 0
So, K_p = K_c
(where, K_p and K_c are equilibrium constants in terms of partial pressures and concentrations.)
Question 10
1 / -0

What is the role of Cr₂O₃ and Fe₂O₃ in Bosch's process?

A
Cr₂O₃ is a promoter and Fe₂O₃ is a catalyst.

B
Cr₂O₃ is a catalyst and Fe₂O is a promoter.

C
Cr₂O₃ and Fe₂O₃ both are catalysts.

D
Cr₂O₃ and Fe₂O₃ both are promoters.

Solution

Bosch process is the process used to prepare di-hydrogen commercially. In this process water gas (CO + H₂) is mixed with two times its volume of steam passed over catalyst Fe₂O₃in the presence of promoter Cr₂O₃ at 773 K by giving CO₂ and H₂as a product.
Question 11
1 / -0

Photochemical smog consists of an excessive amount of X in addition to aldehydes, ketones, PAN, etc. The compound 'X' is

A
methane

B
carbon monoxide

C
carbon dioxide

D
ozone

E
All of the above

Solution

Photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone. This noxious mixture of air pollutants may include the following:
Aldehydes
Nitrogen oxides, particularly nitric oxide and nitrogen dioxide
Peroxyacyl nitrates
Tropospheric ozone
Volatile organic compounds
Question 12
1 / -0

Which of the following sets represents ferromagnetic elements?

A
Fe, Co, Zn

B
Fe, Co, Ni

C
Ti, Fe, Ni

D
Co, Ni, Cu

E
Sc, Tl, Fe

Solution

Substances which are strongly attracted by magnetic field and show permanent magnetism even in the absence of a magnetic field are ferromagnetic.
For example: Fe, Co, Ni, etc.
Question 13
1 / -0

For a reaction A E, the products follow a linear plot of 1/[A]_t versus t. The reaction follows

A
zero-order kinetics

B
first-order kinetics

C
second-order kinetics

D
third-order kinetics

Solution

For second-order kinetics:
Question 14
1 / -0

If = 30 kJ/mol and = 75 J/K mol, then the temperature of vapours at 1 atm pressure is

A
400 K

B
350 K

C
298 K

D
250 K

Solution

T = = 400 K
Question 15
1 / -0

One gram of a mixture of Fe₃O₄ and Fe₂O₃ is treated with H₂ when the following reaction occurs:

3Fe₂O₃ + H₂ 2 Fe₃O₄ + H₂O

The sample weighs 0.97 g after the above reaction is completed. The percentage of Fe₂O₃ in the mixture is about

A
16%

B
14%

C
12%

D
9%

Solution

Molar mass of Fe₂O₃ = (2 x 56 + 3 x 16) g mol^-1 = 160 g mol^-1
Molar mass of Fe₃O₄ = (3 x 56 + 4 x 16) g mol^-1 = 232 g mol^-1
Loss of mass in the reaction due to conversion of Fe₂O₃ to Fe₃O₄ = (3 x 160 - 2 x 232) g mol^-1 = 16 g mol^-1
If x is the mass of Fe₂O₃ in the given mixture, then

= 0.03 g or
Percentage of Fe₂O₃ in the mixture = 0.09 x 100 = 9%