1100-1-chtech-2mark

Choose the correct heating value of the fuel (in kcal/std.m³) listed, from the values given:

• Coke oven gas

  
  

Answer 150060002500150010000

• Natural gas

  
  

Answer 250060002500150010000

• Producer gas

  
  

Answer 350060002500150010000

• Water gas

  
  

Answer 450060002500150010000

GATE-CH-1100-2-chtech-1mark

For the reaction SO₂(g) + 1/2 O₂(g) \(\rightleftharpoons \) SO₃(g), increase in pressure causes

• increase in rate of reaction

• lower equilibrium conversion

• higher equilibrium conversion

• no change in conversion

1100-3-chtech-1mark

The ammonia synthesis catalyst is

• Alumina

• Vanadium Pentoxide

• Iron Oxide

• Kiselguhr

GATE-CH-1989-10-i-chtech-1mark

Catalyst used in the contact process of sulfuric acid manufacture is:

• Alumina

• Vanadium pentoxide

• Iron oxide

• Silicon dioxide

GATE-CH-1994-1-i-chtech-1mark

The most widely used coagulant for removing suspended impurities from water is

• Bleaching powder

• Chlorine

• Calcium sulfate

• Alum

GATE-CH-1997-11-a-chtech-1mark

\(\ce {Na2CO3}\) is produced industrially by

• Solvay process

• Haber process

• Fischer-Tropsch process
  

• Castner-Kellner process
  

GATE-CH-1997-11-b-chtech-1mark

Prilling tower is used for the manufacture of 

• Urea
  

• Cement
  

• Potassium chloride
  

• Triple superphosphate
  

GATE-CH-1997-11-c-chtech-1mark

Extractive distillation is used in the production of 

• Nitric acid
  

• Caustic soda
  

• Sulfuric acid
  

• Urea

GATE-CH-1997-11-e-chtech-1mark

\(\ce {V2O5}\) is used in the manufacture of 

• Sulfuric acid
  

• Ammonia
  

• Polypropylene
  

• Nylon
  

GATE-CH-2000-1-24-chtech-1mark

Triple super phosphate is manufactured by reacting

• phosphate rock with phosphoric acid

• phosphate rock with sulphuric acid

• phosphate rock with nitric acid

• ammonium phosphate with phosphoric acid

GATE-CH-2001-2-24-chtech-2mark

In the converter of the contact process for the manufacture of H₂SO₄, the equilibrium conversion of SO₂ ______(i)______ with increase in the temperature and ______(ii)______ with increase in the mole ratio of SO₂ to air.

• (i) increases (ii) decreases

• (i) decreases (ii) increases

• (i) increases (ii) increases

• (i) decreases (ii) decreases

GATE-CH-2002-2-24-chtech-2mark

In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed

• furnace \(\rightarrow \) converter \(\rightarrow \) absorber

• furnace \(\rightarrow \) evaporator \(\rightarrow \) absorber

• furnace \(\rightarrow \) converter \(\rightarrow \) evaporator

• converter \(\rightarrow \) furnace \(\rightarrow \) absorber

GATE-CH-2003-29-chtech-1mark

The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between

• 2 - 5%

• 7 - 10%

• 12 - 15%

• 20 - 25%

GATE-CH-2003-30-chtech-1mark

The composition of fresh feed to the high temperature high pressure urea autoclave is

• excess liquid ammonia and liquefied CO₂

• excess liquid ammonia and compressed CO₂ gas

• liquid ammonia and excess compressed CO₂

• compressed NH₃ gas and excess compressed CO₂

GATE-CH-2004-29-chtech-1mark

Prilling tower is found in the flowsheet for the manufacture of

• ammonia

• urea

• superphosphate

• triple superphosphate

GATE-CH-2004-87-chtech-2mark

Match the process in Group I with the product in Group II.

Group I	Group II
P. DCDA process	1. Sodium hydroxide
Q. Mercury cell	2. Sulfuric acid
	3. Sodium carbonate
	4. Nitric acid

• P - 1, Q - 4

• P - 1, Q - 2

• P - 2, Q - 3

• P - 2, Q - 1

GATE-CH-2005-79-chtech-2mark

Match the products in Group I with the raw materials in Group II.

Group I	Group II
(P) Caustic soda	(1) Ammonia and sulfuric acid
(Q) Soda ash	(2) Sodium carbonate and slaked lime
	(3) Salt and limestone
	(4) Salt and sulfuric acid

• P - 2, Q - 3

• P - 1, Q - 2

• P - 3, Q - 4

• P - 4, Q - 1

GATE-CH-2009-48-chtech-2mark

Match the product in Group I with the name of the process in Group II.

Group 1	Group 2
P. Sodium carbonate	1. Haber
Q. Ammonia	2. Solvay
R. Sulphuric acid	3. Fischer-Tropsch
	4. Contact

• P - 2, Q - 1, R - 4

• P - 4, Q - 1, R - 2

• P - 3, Q - 4, R - 2

• P - 2, Q - 1, R - 3

GATE-CH-2010-10-chtech-1mark

Match the processes in Group I with the products in Group II.

Group 1	Group 2
P. Claus process	I. Syngas
Q. Linde process	II. Oxygen
R. Lurgi process	III. Sulphur

• P - I, Q - II, R - III

• P - II, Q - I, R - III

• P - III, Q - I, R - II

• P - III, Q - II, R - I

GATE-CH-2010-9-chtech-1mark

For making superphosphate by acidulation of phosphate rock, use of nitric acid is desirable, because

• nitric acid is less expensive than sulphuric acid

• availability of nitrogen enhances the value of the superphosphate as a fertilizer

• the process produces non-hygroscopic superphospate

• the process produces superphosphate having higher phosphorus content than the sulphuric acid process

GATE-CH-2011-2-chtech-1mark

Which ONE of the following sequences is arranged according to INCREASING calorific value?

• Producer gas, Natural gas, Water gas

• Natural gas, producer gas, Water gas

• Producer gas, Water gas, Natural gas

• Water gas, Natural gas, Producer gas

GATE-CH-2011-3-chtech-1mark

The CORRECT sequence of process equipment used in the production of sulfuric acid from sulfur by contact process is

• burner, catalytic converter, 98% sulfuric acid absorption tower, oleum absorption column

• catalytic converter, oleum absorption column, 98% sulfuric acid absorption tower, burner

• burner, catalytic converter, oleum absorption column, 98% sulfuric acid absorption tower

• burner, oleum absorption column, catalytic converter, 98% sulfuric acid absorption tower

GATE-CH-2013-24-chtech-1mark

In the manufacture of sulphuric acid by the contact process, the catalytic oxidation of SO₂ is carried out in multiple stages mainly to

• increase the reaction rate by providing inter-stage heating

• increase the overall conversion by providing inter-stage heating

• increase the overall conversion by providing inter-stage cooling

• decrease the overall conversion by removing sulphur trioxide between stages

GATE-CH-2014-22-chtech-1mark

Decomposition efficiency (\(\eta _D\)) of an electrolytic cell used for producing NaOH is defined as

• \(\eta _D =\) (grams of NaOH produced / grams of NaCl decomposed) \(\times 100\)

• \(\eta _D =\) (grams of NaOH produced / grams of NaCl charged) \(\times 100\)

• \(\eta _D =\) (gram equivalents of NaOH produced / gram equivalents of NaCl charged) \(\times 100\)

• \(\eta _D =\) (theoretical current to produce one gram equivalent / actual current to produce one gram equivalent) \(\times 100\)

GATE-CH-2015-25-chtech-1mark

Match the chemicals written on the left with the raw materials required to produce them mentioned on the right.

(I) Single Superphosphate (SSP)	(P) Rock phosphate + Sulfuric acid + Ammonia
(II) Triple Superphosphate (TSP)	(Q) Brine
(III) Diammonium Phosphate (DAP)	(R) Rock phosphate + Sulfuric acid
(IV) Caustic soda	(S) Rock phosphate + Phosphoric acid

• I - Q, II - R, III - S, IV - P

• I - S, II - P, III - Q, IV - R

• I - R, II - S, III - P, IV - Q

• I - S, II - R, III-P, IV - Q

GATE-CH-2017-23-chtech-1mark

The DCDA (Double Contact Double Absorption) process is used for the manufacture of

• urea

• sulphuric acid

• nitric acid

• ammonia

GATE-CH-2017-25-chtech-1mark

The purpose of methanation reaction used in ammonia plants is to

• remove CO as it is catalyst poison

• increase the amount of hydrogen

• remove sulphur as it is a catalyst poison

• utilize methane as a catalyst for ammonia synthesis

GATE-CH-2014-54-chtech-2mark

Determine the correctness or otherwise of the following Assertion and Reason.

Assertion: Significant combustion of coke takes place only if it is heated at higher temperature in presence of air.

Reason: C + O₂ \(\rightarrow \) CO₂ is an exothermic reaction.

• Both ‘a’ and ‘r’ are true and ‘r’ is the correct reason for ‘a’

• Both ‘a’ and ‘r’ are true but ‘r’ is not the correct reason for ‘a’

• ‘a’ is correct but ‘r’ is false

• Both ‘a’ and ‘r’ are false

GATE-CH-1988-10-ii-chtech-2mark

Triple super phosphate is manufactured by reacting -------------------- and --------------------

• Answer

GATE-CH-1989-10-iii-b-chtech-2mark

The principal reactants for the manufacture of urea are -------------------- and -------------------- . The undesirable reaction during the process is the formation of --------------------

• Answer

GATE-CH-1989-10-iii-c-chtech-2mark

The principal raw materials for the manufacture of sodium hydroxide by the -------------------- process is -------------------- , in which process -------------------- and -------------------- gases are the byproducts.

• Answer

GATE-CH-1989-20-i-chtech-2mark

Arrange the following fuel gases in the increasing order of their heating values:
Producer gas, natural gas, water gas, coke oven gas.

• Answer

GATE-CH-1989-20-ii-chtech-3mark

What are the following processes used for ?

1. Solvay process
2. DCDA process
3. Haber process
4. IMI process
5. Electrolyism Hooker-S cell
6. Stengel process

• Answer

GATE-CH-1991-1-ii-b-chtech-2mark

In the manufacture of Portland cement, the major raw materials are -------------------- , -------------------- , -------------------- and --------------------

• Answer

GATE-CH-1993-7-b-i-chtech-1mark

A fertilizer is rated as 10-12-15. What does it mean?

• Answer