UNICAL Chemistry 2012/2013 Past Questions

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

$$^{114}_{55}Cs \rarr ^{a}_{z}E + ^{4}_{2}\alpha$$ Find the value of A and Z in the equation above

A.119, 53
B.110, 57
C.110, 53
D.110, 58

How many moles of H₂ molecules are needed to convert 5mole of O₂ molecules to water?

A.5 mole H2
B.10 mole H2
C.15 mole H2
D.20 mole H2

$$^{226}_{88}Ra \rarr ^{x}_{86}Rn + \alpha$$ What is the value of x in the nuclear reaction above?

A.220
B.222
C.226
D.227

When naphthalene on heating changes from solid state directly to the gaseous state, it undergoes

A.sublimation
B.evaporation
C.combustion
D.decomposition

Which of the following is an electrolyte?

A.alcohol
B.sodium ethanoate
C.solid potassium
D.hydroxide
E.mercury

The equation: $$^{14}_7N + ^4_2He \rarr ^{17}_{8}O + ^{1}_{1}P$$ represents

A.nuclear fusion
B.nuclear fission
C.artificial radioactivity
D.nuclear fission using positron

Which of the following is a general method of preparing acids?

A.direct combination of constituent elements
B.double decomposition involving a salt solution
C.reaction between an anhydride and water
D.reaction between a base and an amphoteric oxide
E.decomposition of hydroxides followed by neutralization

Monosaccharide are

A.hydrolysable
B.non-hydrolysable
C.not soluble in water
D.sweet but sometimes non-sugary

The major air pollutants that can result from smoky vehicles include

A.acid fumes
B.hydrogen sulphide
C.carbon(II)oxide
D.carbon particles

If an element has the electronic configuration $$1s^2 2s^2 2p^6 3s^2 3p^4$$, it is

A.metal
B.an alkaline earth metal
C.an s-block element
D.a p-block element