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2017 Ondo State Joint Exam Chemistry Obj And Theory Answers

CHEMISTRY ANSWERS

ONDO STATE 2017 JOINT PROMOTION EXAM

CHEMISTRY OBJ:
1-10: ABBADBCBAD
11-20: ADCBCDCCCD
21-30: DCBDDDDABB
31-40: BCAADBCBAB

COMPLETED…

CHEMISTRY THEORY:

INSTRUCTION: Answer four (4) Question in All. Each Question Carry Equal Marks (15 Marks)

(4ai)

Boyle’s Law state that the volume of a given mass of a gas is inversely proportional to its pressure, provided that the temperature remain constant.

i.e V ∝ 1/P
V = K/P
PV = K

(ii)

 

(4bi)Given
Y, =500cm^3
P1=6.5X10^4Nm^2
T2=273
V2=7
P1V1 = P2V2
——– ———
T1 = T2

V2= P1V1T2
——————
P2 T1
V2= P1V1T2
———————
P2 T1
V2=6.5X10^4X500X273
————————-

1.0X10^5X303
V2= 8822500000
———————
30300000
=292.8CM^3

1.0X10^1CM^2
T1=2,73+60
=303√√

 

(bii)An inflated balloon expands in warm water because the Air particle in the balloon acquire more kinetic energy. there is an increase in the pressure inside the balloon and in order to keep the pressure constant, the balloon expand.

(4ci)Hard Water is a water which will not readily form lather with soap.

(cii)

– Calcium Tetraoxosulphate (vi) CaSO4

– Magnesium Hydrogen (MgH2)

– Trioxocarbonate (iv) CO3

(ciii)
– Addition of washing soda crystal (Na2CO3)

– Addition of Calculated amount of calcium hydroxide [Ca(OH)2

(5a)
(i) Normal Salt are salt formed wen all the replaceable hydrogen ion in the acid have been completely replaced by metallic ions.

(ii) Acid Salt are salt formed when the replaceable hydrogen ions in acid are only partially replaced by a metal

COMPLETED…


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