by Sunday | Apr 19 | Chemistry NECO
The equation for the reaction is: Zn(s) + CuSO4(aq)→ZnSO4(aq)+Cu(s) [CU= 64; Zn=65] A. 3.2 g B. 3.25 g C. 6.4 g D. 6.5 g E. 64.0 g Correct Answer: Option C – 6.4 g
by Sunday | Apr 19 | Chemistry NECO
A. calcium B. fluorine C. iodine D. oxygen E. sodium Correct Answer: Option B – fluorine
by Sunday | Apr 19 | Chemistry NECO
A. 2-chloro -3 methylbut -2yne B. 2 -chloro -3 methylbut -2ene C. 2 -chloro -3 methylbutene D. 3- methyl -2-chlorobut -2-ene E. 3- methyl -2. chlorobut -2 yne Correct Answer: Option B – 2 -chloro -3 methylbutene
by Sunday | Apr 18 | Chemistry NECO
A. CH3CH2CHO B. CH3CH2CH2OH C. CH3CH2COOH D. CH3CH2OCH E. CH3CH3OH Correct Answer: Option B
by Sunday | Apr 18 | Chemistry NECO
A. chemical properties B. electric charge C. electronic structure D. number of electrons E. number of neutrons Correct Answer: Option E – number of neutrons
by Sunday | Apr 18 | Chemistry NECO
A. nylon B. Orion C. Perspex D. polystyrene E. wool Correct Answer: Option E – wool
by Sunday | Apr 18 | Chemistry NECO
A. the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is covalent B. the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules C. water has higher lattice energy than ethanol. D. water has...
by Sunday | Apr 18 | Chemistry NECO
A. bleaches impurities in the water B. decolorizes water C. destroys bacteria D. is extremely soluble in water E. is pleasant tasting Correct Answer: Option C – destroys bacteria
by Sunday | Apr 18 | Chemistry NECO
A. It contains only the atoms of carbon, hydrogen oxygen B. It is a polysaccharide C. Its empirical formula is C2H2O. D. It is made from the monomer C6H12O6 E. The hydrogen and oxygen atoms are in the ratio 2:1. Correct Answer: Option C – Its empirical formula...
by Sunday | Apr 18 | Chemistry NECO
A. 0.008 B. 0.08 C. 0.1 D. 0.8 E. 8.02 Correct Answer: Option B – 0.08