Question 1 of 20 91 total questions
What is the electronic configuration of an element represented as 199 X?
A 1s 2 2s2 2p 5
B 1s2 2s2 3s2 3p3
C 1s2 2s2 2p 3 3s2
D 1s 2 2s2 2p 6 3s2 3p6 4s 1
Which of the following atoms contains the highest number of electrons in the outermost shell?
Which of the compounds above would react to take up two molecules of bromine durng bromination?
A l only
B lll only
C l and ll only
D ll and lll only
In the diagram above, the mixture of the solids P and Q can be separated by?
A distillation
B fractional distillation
C crystallization
D fractional crystallization
Use the table above to answer this question .The least reactive element is
Use the table above to answer this question . The element that is likely to participate in covalent rather than ionic bonding is
In the diagram above, Y is a mixture of
A calcium hydroxide and ammonium chloride
B calcuim hydroxide and sodium chloride
C sodium chloride and ammonuim trioxonitrate (V)
D sodium dioxonitrate (lll) and ammouium chloride
From the diagram above the mass of crystals deposited when 1 dm 3 of a saturated solution of NaCl is cooled from 80 o C to 60o C is
A 117.00 g
B 58.50 g
C 11.70 g
D 5.85 g
When the two end alkyl groups ethyl ethanoate are interchange, the compound formed is known as
A methyl ethanoate
B ethyl propanaote
C methyl propanoate
D propyl ethanoate
An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be
A alkene
B alkanal
C alkanone
D alkanoic acid
POlyvinyl chloride is used to produce
A bread
B pencils
C ink
D pipes
When excess ethanol is heated to 145o C in the presence of concentrated H2 SO4 , the product is
A ethyne
B diethyl sulphate
C diethyl ether
D acetone
Which of the following is a solvent for perfumes?
A C5 H12
B C4 H6
C CH3 COOH
D C2 H5 OH
2-methylprop-1-ene is an isomer of
A but-2-ene
B pent-1-ene
C 2-methylbut-2-ene
D 2-methylbut-1-ene
The hydrocarbon that burns in air with a sooty flames is
Which of the following metals is passive to concentrated trioxonitrate (V) acid?
A metal that can be extracted from cassitertite is
A cacium
B magnesium
C tin
D copper
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
A magnesium and zinc
B magnesium and calcium
C copper and zinc
D lead and calcium
What properties of duralumin make it more useful than its constituent metals?
A It is heavy with a high melting point
B It is malleable and has high density
C It is strong and light
D It is hard and ductile
Hydrogen is used in oxy-hydrogen flames for melting metals because it
A evolves a lot of heat when burnt
B combines explosively with oxygen
C is a very light gas
D is a rocket fuel
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