Which is/are physical methods for ore concentration?
- Gravity seperation
- Magnetic separation
- Froth floatation method
- All of these
Submitted by :- Muhammad Nawaz
mnsoomro
SN2 reaction can be best carried out with__________________?
A. primary alkyl halide
B. secondary alkyl halide
C. tertiary alkyl halide
D. all
Submitted by :- Jamil Ahmed
When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________?
A. propane
B. propanal
C. propanoic acid
D. propanol
Submitted by :- Jamil Ahmed
Which is a nitrogenous fertilizer?
- Calcium ammonium nitrate
- Ammonia sulfate
- Urea
- All above
Submitted by :- Muhammad Nawaz
When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed ?
A. 2 moles of ethane
B. 1 mole of ethane
C. 2 moles of butane
D. 1 mole of butane
Submitted by :- Jamil Ahmed
Which is the most effective pesticide?
- Organophosphates
- Carbamates
- Organochlorines
- All of these
Submitted by :- Muhammad Nawaz
Which alkyl halide out of the following may follow both SN1 and SN2 mechanism ?
A. CH3-X
B. (CH3)3 C-CH2 – X
C. (CH3)2 CH – X
D. (CH3)3 C – X
Submitted by :- Jamil Ahmed
Which of the following is green manure/ bio fertilizer?
- Oat
- Rice
- Sesbania
- Maize
Submitted by :- Muhammad Nawaz
Which one is not a nucleophile ?
Organic farming is the technique of raising crops through uses of ______.
- Manures
- Resistant varieties
- Bio fertilizers
- All of these
Submitted by :- Muhammad Nawaz