Surface Chemistry Test

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Surface Chemistry Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Wilkinson catalyst is:

A
$$[(Ph_3P)_3 RhCl]$$ $$(Et = C_2H_5)$$

B
$$[Et_3P)_3IrCl]$$

C
$$[Et_3P)_3RhCl]$$

D
$$[Ph_3P)_3IeCl]$$

Solution

Wilkinson's catalyst is the common name for chloridotris(triphenylphosphine)rhodium(I), a coordination complex of rhodium with the formula [RhCl(PPh$$_3$$)$$_3$$] (Ph = phenyl). It is a red-brown colored solid that is soluble in hydrocarbon solvents such as benzene, and more so in tetrahydrofuran or chlorinated solvents such as dichloromethane. The compound is widely used as a catalyst for hydrogenation of alkenes. It is named after chemist and Nobel laureate Sir Geoffrey Wilkinson, who first popularized its use.

Hence, the correct option is $$\text{A}$$
Question 2
1 / -0

The reaction, $$CO(g) +2H_2(g) \xrightarrow {ZnO/Cr_2O_3}CH_3OH(g)$$ is an example of:

A
homogeneous catalysis

B
heterogeneous catalysis

C
Auto catalysis

D
Enzyme catalysis
Question 3
1 / -0

$$CO+H_2$$ $$\xrightarrow[573K/300 atm]{X(catalyst)}$$ $$CH_3OH$$, the catalyst X is

A
$$Fe$$

B
$$Cr_2O_3/ZnO$$

C
$$V_2O_5$$

D
$$Al_2O_3$$

Solution
Question 4
1 / -0

Lindlar's catlyst is used for conversion of:

A
alkynes to alkenes

B
alkane to alkyne

C
alkyne to alkane

D
alkene to alkyne

Solution

A Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate which is then poisoned with various forms of lead or sulphur. It is used for the hydrogenation of alkynes to alkenes (i.e. without further reduction into alkanes) and is named after its inventor Herbert Lindlar.

Hence, the correct option is $$\text{A}$$
Question 5
1 / -0

Which is the wrong pair?
i) Starch solution : sol
ii) $$aq.\ NaCl$$ : true solution
iii) milk : emulsion
iv) $$aq.\ BaSO_{4}$$ : true solution

A
$$(i)$$

B
$$(iii)$$

C
$$(iv)$$

D
$$(ii)$$

Solution
Question 6
1 / -0

If Pt is used as catalyst in the decomposition of $$H_{2}SO_{4}$$ then it is an example of:

A
homogeneous catalysis

B
heterogenous Catalysis

C
negative Catalysis

D
auto Catalysis

Solution

As we know that Platinum is metal, thus it is solid in Phase whereas $$H_2SO_4$$ is liquid.
Thus both are in a different phase, thus heterogeneous catalysis.
Question 7
1 / -0

Which one of the following is not a correct statement?

A
Physical adsorption is reversible in nature.

B
Physical adsorption involves Van der Waal's forces.

C
Rate of physical adsorption increases with increase of pressure on the adsorbate.

D
High activation energy is involved in physical adsorption.

Solution
Question 8
1 / -0

In physical adsorption, the forces associated are

A
Ionic bond

B
Covalent bond

C
Van der Waal's forces

D
All of these

Solution
Question 9
1 / -0

Which gas will be adsorbed on a solid to greater extent?

A
A gas having non-polar molecules.

B
A gas having higher critical temperature.

C
A gas having lowest critical temperature.

D
A gas having higher critical pressure.

Solution
Question 10
1 / -0

Bredig's Arc method can be used to prepare colloidal solution of

A
Au

B
Ag

C
Pt

D
All of the these