RSUT Chemistry 2018/2019 Past Questions

Practice each question, then open it to see the full details.

When platinum electrodes are used during the electrolysis of copper (II) tetraoxosulphate (IV) solution, the solution gets progressive

A.acidic
B.basic
C.neutral
D.atmospheric

Which of the following physical properties decreases across the periodic table

A.ionization potential
B.electron affinity
C.electronegativity
D.atomic radius
E.electropositive reaction

Which of these has the lowest pH value?

A.calcium trioxocarbonate (IV)
B.sodium trioxocarbonate (IV)
C.hydrochloric acid
D.ethanoic acid
E.hydrocarbon acid

Which of the following is used in fire extinguishers?

A.carbon (II) oxide
B.carbon (IV) oxide
C.Sulphur (IV) oxide
D.ammonia
E.Sulphur (III) oxide

Mortar is NOT used for under water construction because

A.it hardens by loss of water
B.its hardening does not depend upon evaporation
C.it requires concrete to harden
D.it will be washed away by the flow of water
E.it softens when exposed

The overall reaction in an electrochemical cell is: Mg(s) + Cu²⁺(aq) &rightarrow Mg²⁺(aq) + Cu(s).
What is the symbolic representation of the cell?

A.Mg(s)/Mg²⁺(aq) || Cu²⁺(aq)/Cu(s)
B.Mg(aq)/Mg^2+(s) || Cu²⁺(s)/Cu(aq)
C.Cu²⁺(aq)/Cu(s) || Mg(s)/Mg²⁺(aq)
D.Cu(s)/Cu²⁺(aq)|| Mg²⁺(aq)/Mg(s)

Which of the following metals can be used as sacrificial cathode for preventing corrosion of a length of iron pipe?

A.Ag
B.Cu
C.Mg
D.Mn

A particle that contains 8 protons, 9 neutrons and 7 electrons could be written as

A.¹⁶₈ O
B.¹⁷₈O⁺
C.¹⁷₉ O⁺
D.¹⁷⁸ O

The decreasing order of the magnitude of energy changes is

A.phase, chemical, nuclear
B.chemical, nuclear, phase
C.nuclear, phase, chemical
D.nuclear, chemical, phase

0.92g of ethanol raised the temperature of 100g water from 298K to 312.3K when burned completely. What is the heat of combustion of ethanol?

(C = 12, H = 1, 0 = 16, specific heat capacity of water = 4.2Jg^-1K^-1)

A.+300KJmol^-1
B.+3000KJmol^-1
C.-300KJmol^-1
D.-3000KJmol^-1