B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.

For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.

A

(i) platinum (ii) sulphur

B

(i) palladium (ii) oxygen

C

(i) nickel (ii) sulphur

D

(i) nickel (ii) oxygen

BET apparatus

A

Measures the catalyst surface area directly

B

Operates at very high pressure

C

Is made entirely of stainless steel

D

None of these

BET apparatus is used to determine the

A

Specific surface of a porous catalyst

B

Pore size distribution

C

Pore diameter

D

Porosity of the catalyst bed

A catalyst is said to be a negative catalyst, ifit

A

Retards the rate of reaction

B

Reduces the value of equilibrium constant

C

Does not initiate the reaction

D

All of the above

Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)

A

Tan hT/T

B

Tan T/T

C

Tan hT/tan T

D

None of these

Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a

A

Straight line

B

Sine curve

C

Parabola

D

Hyperbola

The January isotherm taken as a basis for dividing India into tropical and subtropical zones is ________

A

21° C

B

18° C

C

12° C

D

15° C

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংয়ের গুণাঙ্ক তামার ইয়ংয়ের গুণাঙ্কের দুইগুণ হলে লোহার দৈর্ঘ্য বৃদ্ধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? ( A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young's modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1 :8

B

1 : 6

C

1 : 4

D

1 : 2

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংকের গুণাস্ক তামার ইয়ংকের গুণাস্কের দুইগুন হলে লোহার দৈর্ঘ্য বৃধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? (A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young‘s modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1:8

B

1:6

C

1:4

D

1:2

Catalyst used in ammonia synthesis uses __________ as a promoter.

A

Pt

B

K₂O

C

Al₂O₃

D

Ni

B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.

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