Chemical Technology GATE-2019

Q 1: Producer gas is obtained by

A) Passing air through red hot coke 
B) Thermal cracking of naphtha 
C) Passing steam through red hot coke
D) Passing air and steam through red hot coke

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Q 2: In the Kraft process, the essential chemical reagents used in the digester are

A) Caustic soda, mercaptans and ethylene oxide
B) Caustic soda, sodium sulphide and soda ash 
C) Quick lime, salt cake and dimethyl sulfide
D) Baking soda, sodium sulfide and mercaptans

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Q 3: The most common catalyst used for the oxidation of o-xylene to phthalic anhydride is

A) V₂O₅
B) Pd 
C) Pt
D) Ag

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Q 4: In petroleum refining operations, the process used for converting paraffin and naphthene to aromatics is

A) Alkylation
B) Catalytic reforming  
C) Hydrocracking
D) Isomerization

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Q 5: The combination that correctly matches the polymer in Group 1 with the polymerization reaction type in Group 2 is

Group -1	Group -2
P: Nylon 6	I: Condensation polymerization
Q: Polypropylene	II: Ring-opening polymerization
R: polyester	III: Addition polymerization

A) P-II, Q-I, R-III
B) P-I, Q-III, R-II
C) P-III, Q-II, R-I
D) P-II, Q-III, R-I

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Q 6: The combination that correctly matches the process in Group 1 with the entries in Group 2 is

Group -1	Group -2
P: Wulff process	I: Sulfur mining
Q: Sulfite process	II: Soda ash production
R: Solvay process	III: Acetylene production
S: Frasch process	IV: Pulp production

A) P-II, Q-IV, R-III, S-I 
B) P-III, Q-IV, R-II, S-I
C) P-IV, Q-I, R-II, S-III
D) P-II, Q-I, R-IV, S-III

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