Which ore is/are used for Zn extraction?
- Zincite
- Zinc blende
- Calamine
- All of these
Submitted by :- Muhammad Nawaz
Grignard reagent is reactive due to___________________?
A. the presence of halogen atom
B. the presence of magnesium atom
C. the polarity of C-Mg bond
D. all
Submitted by :- Jamil Ahmed
Which of the following is/are chemical methods for ore concentration?
- Calcination
- Smelting & leaching
- Roasting
- All of these
Submitted by :- Muhammad Nawaz
Elimination bimolecular reactions involve____________________________?
A. first order kinetics
B. third order kinetics
C. second order kinetics
D. zero order kinetics
Submitted by :- Jamil Ahmed
Alkyl halides undergo a type of reaction_________________?
A. Nucleophilic substitution
B. Nucleophilic addition
C. Elimination
D. both A & C
Submitted by :- Jamil Ahmed
Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield __________________?
A. primary alcohol
B. tertiary alcohol
C. secondary alcohol
D. dihydric alcohol
Submitted by :- Jamil Ahmed
Which of the following is the process of removing matrix/gangue by fusing with flux?
- Roasting
- Sintering
- Calcination
- Smelting
Submitted by :- Muhammad Nawaz
Which ore is/are used for Pb extraction?
- Galena
- Zinc blende
- Cinnabar
- Calamine
Submitted by :- Muhammad Nawaz
Alkyl halides are considered to be very reactive compounds towards nucleophile because_________________?
A. they have an electrophilic carbon
B. they have an electrophilic carbon & a good leaving group
C. they have an electrophilic carbon & a bad leaving group
D. they have a nucleophilic carbon & a good leaving group
Submitted by :- Jamil Ahmed
Which of the following ores is/are separated by froth floatation method?
- Galena (PbS)
- Copper pyrite (CuFeS2)
- Zinc blende (ZnS)
- All of these
Submitted by :- Muhammad Nawaz