When steam is passed over white-hot coke, the products are
Відповідь
(B)
carbon (II) oxide and hydrogen
2
The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is
Відповідь
(D)
18
3
Methanol is obtained from wood by
Відповідь
(E)
destructive distillation
4
Study carefully the reaction represented by the equation below. 2H2O 2(l) → O 2(g) + 2H2O(l). Which of the following will not reaction increase the reaction rate?
Відповідь
(D)
Adding water to the reactant
5
Which of the following processes is a physical reaction?
Відповідь
(C)
Allotropic change
6
If the volume of a given mass of gas at 298 K and pressure of 205.2 x 10\(^3\) Nm\(^{-2}\) is 2.12dm\(^3\), what is volume of the gas at s.t.p? (Standard pressure = 101.3 x 10\(^3\) Nm\(^{-2}\), Standard temperature = 273K)
Відповідь
(D)
3.93dm3
7
The following acids are monobasic except
Відповідь
(C)
ethanedioic acid
8
The reactions ethyne are mainly
Відповідь
(B)
addition reactions
9
When air is passed through potash and then pyrogallol, the components are noble gases,
Відповідь
(C)
nitrogen and water vapour
10
The halide used widely in photography is
Відповідь
(C)
silver bromide
11
The scum formed when soap is mixed with hard water could be
Відповідь
(A)
calcium trioxocarbonate (IV)
12
What is the quantity of electricity produced when a current of 0.5A is passed for 5 hours 45 mins? (1F = 96500C)
Відповідь
(A)
0. 11F
13
''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the
Відповідь
(D)
collision theory
14
What is the following compounds will not decompose when heated strongly ?
Відповідь
(B)
K2CO3
15
What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P (s) + 5O(2)(g) → 2P2O5(g)
Відповідь
(B)
0 to 5
16
When iron rusts, it undergoes
Відповідь
(D)
redox reaction
17
Consider the compounds represented by the following general formula: X2SO4 Y2(SO4)3, 24H2OX and Y could respectively be
Відповідь
(A)
K and AI
18
Which of the following involves the decomposition enzymic action?
Відповідь
(B)
Fermentation
19
The following salts are readily soluble in water except
Відповідь
(D)
CuCO3
20
When sucrose is warmed with Fehling's solution
Відповідь
(D)
there is no precipitate
21
Which of the following gases will have the highest rate of diffusion under the same conditions? (H = 1, C =12, O = 16, S = 32, CI = 35.5)
Відповідь
(A)
O2
22
The formula (CH3),3 COH is that of a
Відповідь
(C)
tertiary alkanol
23
What is the number of oxygen atoms in 32g of the gas? (O = 16, L = 6.0 X 10\(^{23}\) mol\(^{-1}\))
Відповідь
(B)
6.0 X 1023
24
Which of the following compounds is not correct about the reaction of sodium material for the manufacture of plastics?
Відповідь
(B)
Ethane
25
The energy required to remove the most loosely bound electron from an atom in the gaseous state is known as the
Відповідь
(B)
ionization energy
26
Vulcanization of rubber
Відповідь
(D)
hardnes the rubber through cross-linkage
27
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
Відповідь
(A)
the reaction vessel gets hotter as the reaction proceeds
28
If a reaction is said to be exothermic, which of the following statements is a correct deduction from the information?
Відповідь
(A)
the reaction vessel gets hotter as the reaction proceeds
29
Which of the following statement is not correct about esterification?
Відповідь
(C)
it is similar to hydrolysis
30
Which of the following statements is not correct? The 4s orbital
Відповідь
(B)
is of higher energy than the 3d orbital
31
Which of the following pH values is likely to be that of a slightly alkaline solution?
Відповідь
(D)
8
32
Which of the following minerals contains flurine as one of its constituent elements?
Відповідь
(A)
Cryolite
33
The product of the reaction between propanoic acid and ethanol is
Відповідь
(E)
ethylpropanoate
34
Which of the following groups contains entirely linear molecules?
Відповідь
(D)
CO2H2N2
35
What is the value of n in the following equation? XO-4 +8H + + ne- → X2 + + 4H2O
