Equilibrium is said to be attained in reversible reaction when
Trả lời
(D)
the rates of the forward and backward reactions are equal
2
An acid present in proteins is
Trả lời
(B)
amino acid
3
The following are uses of sulphur except
Trả lời
(E)
coating of steel to prevent rusting
4
The reaction represented by the equation NaOH(aq) + HCI(aq) → NaCI(aq) + H2O(/)
Trả lời
(B)
is a neutralization
5
Which of the following compound is aromatic?
Trả lời
(A)
Benzene
6
Which of the following does not affect the rate of a chemical reaction?
Trả lời
(C)
The enthalpy change for the reaction
7
Which of the following does not affect the rate of a chemical reaction?
Trả lời
(C)
The enthalpy change for the reaction
8
Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}
Trả lời
(C)
6.02 x 1022
9
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
Trả lời
(B)
CH3
10
A salt which loses mass when exposed to air is
Trả lời
(C)
efflorescent
11
Detergents are better than soaps for laundry because
Trả lời
(C)
scum is precipitated when soaps are used with hard water but not with stergents
12
Which of the following is used as an anaesthetic?
Trả lời
(B)
CHCI3
13
Which of the following types of hybridization gives rise to tetrahedral molecules?
Trả lời
(C)
sp3
14
Which of the following is a neutral oxide?
Trả lời
(E)
Nitrogen oxide
15
Which of the following statements is not correct?
Trả lời
(C)
Chlorine exhibits allotopy
16
The following are uses of radioactive isotopes except for
Trả lời
(E)
determining equilibrum positions
17
The main characteristic feature of transition metals is that they
Trả lời
(D)
have variable oxidation states
18
The following are heavy chemicals except
Trả lời
(E)
dyes
19
What quantity of silver is deposited when 96500C of electricity is passed through a solution containing silver ions? (Ag = 108, 1F = 96500C)
Trả lời
(E)
108g
20
Bubbling of carbon (IV)oxide into calcium hydroxide solution results in the formation of
Trả lời
(A)
CaCO3
21
Which of the following is not decomposed by heat?
Trả lời
(D)
Na2CO3
22
Which of the following is not true of the rusting of iron?
Trả lời
(A)
Rusting is a reduction process
23
Which of the following is not true of the rusting of iron?
Trả lời
(A)
Rusting is a reduction process
24
What volume of oxygen will be left unreacted when a mixture of 100cm3 of hydrogen and 200cm,sup>3,/sup> of oxygen are exploded in a eudiometer?
Trả lời
(C)
150cm3
25
How many isomers can be obtained from C4H10?
Trả lời
(C)
2
26
Water gas is a mixture of?
Trả lời
(E)
CO and H2
27
Which of the following metals cannot extracted from its ore by using carbon (ll) oxide as the reducing agent?
Trả lời
(C)
Al
28
Which of the following is not a naturally occurring iron ore?
Trả lời
(A)
FeCl2
29
Which of the following equations represents the reaction of chlorine with hot concentrated sodium hydroxide solution?
Trả lời
(C)
6NaOH + 3CI2 → NaCIO3 + 5NaCI + 3H2O
30
Aqueous sodium trioxocarbonate (IV) solution is alkaline because
Trả lời
(E)
sodium triocarbonate (IV) is hydrolysed in water
31
Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated?
Trả lời
(C)
lodine molecules are held together by weak forces
32
Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)?
Trả lời
(E)
Calcium chloride
33
When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of
Trả lời
(E)
[cU(NH3)4] ions
34
The complex salt formed when aluminium dissolves in sodium hydroxide solution is
Trả lời
(E)
NaAI(OH)4
35
The reaction represented by the equation C(s) + H2O(l) → CO(s) + H 2(s) was carried out at 27oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)
