Which of the following formula is that of a dicarboxylic acid?
(CH3CH 2)2CHCOOH
CH2(OH)2
CH3CH(OH)COOH
CH2(COOH)2
CH3COCOOH
Correct answer is D
No explanation has been provided for this answer.
Brass is an alloy of copper and
iron
chromium
zinc
tin
magnesium
Correct answer is C
No explanation has been provided for this answer.
substitution
oxidation
reduction
addition
displacement
Correct answer is D
No explanation has been provided for this answer.
Which of the following elements can from more than one acidic oxide?
Hydrogen
Sulphur
Carbon
Alumium
Iron
Correct answer is B
No explanation has been provided for this answer.
C6H3(l) → C6H 6 (g)
H2O (s) → H2O(l)
CuO(s) + H2(g) → Cu(s) + H2
Na2CO3(s) + nH2O(l) →Na 2CO3nH2O(s)
S(s) → S(l)
Correct answer is A
we have the greatest entropy when a substance changes from the liquid phase to the gaseous phase this is because the particles of gases are very loosely packed so they have the freedom to move around.