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Chemistry NECO SSCE 2003 Matter & Separation Techniques
The boiling point of water is higher than the boiling point of ethanol because
A
the bonding in water is electrovalent (ionic) whereas the bonding in ethanol is convalent
B
the hydrogen bonding between water molecules is stronger than the hydrogen bonding between ethanol molecules
C
water has a higher lattice energy than ethanol.
D
water has hydrogen bonding between its molecules but ethanol has no hydrogen bonging between its molecules;
E
water is a better solvent than ethanol.
medium Difficulty
Chemistry NECO SSCE 2003 Matter & Separation Techniques
The reaction C2H6 → C2H + H2 is known as
A
dehydration
B
dehydrogenation
C
displacement
D
hydrogenation
E
reduction
medium Difficulty
Chemistry NECO SSCE 2003 Organic Chemistry
Which is NOT a synthetic polymer?
A
nylon
B
Orion
C
Perspex
D
polystyrene
E
wool
medium Difficulty
Chemistry NECO SSCE 2003 Matter & Separation Techniques
A calcium atom and a calcium ion have the same
A
chemical properties
B
electric charge
C
electronic structure
D
number of electrons
E
number of neutrons
medium Difficulty
Chemistry NECO SSCE 2003 Acids, Bases, and Salts
Which compound will give propane when it Is dehy drated by an excess of hot, concentrated tetraoxosvlphate(VI) acid?
A
CH3CH2CHO
B
CH3CH2CH2OH
C
CH3CH2COQH
D
CH3CH20CH
E
CH3CH3OH
medium Difficulty
Chemistry NECO SSCE 2003 Acids, Bases, and Salts
Which formula is used to indicate the degree of acidity of an acid?
A
\( [H^+] = ^{\text{mass of acid relative}} molecular mass of acid \)
B
F = number of H+ = ions x molar mass of the acid
C
Kw = [H+][OH-]
D
pH = - log10[H+]
E
pKa = -log10Ka
medium Difficulty
Chemistry NECO SSCE 2003 Atomic Structure and Periodic Table
What is the IUPAC name of CH3CCI=C(CH3)2?
A
2-chloro -3 methylbut -2yne
B
2 -chloro -3 methylbut -2ene
C
2 -chloro -3 methylbutene
D
3- methyl -2-chlorobut -2-ene
E
3- methyl -2. chlorobut -2 yne
medium Difficulty
Chemistry NECO SSCE 2003 Matter & Separation Techniques
What change will occur to the equilibrium mixture \( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
A
A yellow precipitate of Cr(OH)3 is formed
B
An orange precipitate of Cr(OH)3 is formed
C
The colour changes from orange to yellow
D
The colour changes from yellow to orange
E
There is no visible reaction.
medium Difficulty
Chemistry NECO SSCE 2003 Atomic Structure and Periodic Table
Which element is the most electronegative?
A
calcium
B
fluorine
C
iodine
D
oxygen
E
sodium
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry & Mole Concept
What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution? The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]
A
3.2 g
B
3.25 g
C
6.4 g
D
6.5 g
E
64.0 g
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry & Mole Concept
An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%. What is the empirical formula of the compound? [C = 12, H = 1, Br=80]
A
CH3Br
B
C2H5Br
C
C3H5Br
D
C3H7Br
E
C4H9Br
medium Difficulty
Chemistry NECO SSCE 2003 Acids, Bases, and Salts
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
A
Cotton is hydrolysed completely to glucose
B
The fabrics are soluble in dilute acids
C
The molecular chains are partially broken
D
The molecular chain length f the fabric increases
E
The thread holding the fabric together Is completely destroyed.
medium Difficulty
Chemistry NECO SSCE 2003 Atomic Structure and Periodic Table
Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?
A
6
B
6.8
C
6.9
D
7
E
7.1
medium Difficulty
Chemistry NECO SSCE 2003 Stoichiometry & Mole Concept
What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]
A
6.89g
B
6.93g
C
6.98g
D
7.04g
E
7.12g
medium Difficulty
Chemistry NECO SSCE 2003 Matter & Separation Techniques
Which metal is a constituent of both bronze and solder?
A
copper
B
lead
C
silver
D
tin
E
zinc
medium Difficulty
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