What is the solubility of a salt if 0.4g of it is obtained on evaporating 200\(cm^{3}\) of its saturated solution to dryness?
პასუხი
(B)
2.00\(gdm^{-3}\)
6
An acidic salt has
პასუხი
(C)
hydrogen ions in its aqueous solution
7
A reaction is endothermic if the
პასუხი
(A)
reaction vessel feels cool during the reaction
8
In which of the following compounds does hydrogen form ionic compounds?
პასუხი
(D)
NaH
9
An organic compound has the empirical formula \(CH_{2}\). If its molar mass is 42\(gmol^{-1}\), what is its molecular formula? (C = 12.0, H = 1.0)
პასუხი
(C)
\(C_{3}H_{6}\)
10
Consider the following reaction equation: \(Br_{2} + 2KI \to 2KBr + I_{2}\). Bromine is acting as
პასუხი
(A)
an oxidizing agent
11
Ethene is produced from ethanol by
პასუხი
(D)
dehydration
12
Consider the following equilibrium reaction: \(2AB_{{2}{(g)}} + B_{{2}{(g)}} \to 2AB_{{3}{(g)}}\). \(\Delta H= -X kJmol^{-1}\). The backward reaction will be favored by
პასუხი
(A)
a decrease in pressure
13
What is the mass of solute in 500\(cm^{3}\) of 0.005\(moldm^{-3}\) \(H_{2}SO_{4}\)? ( H = 1, S = 32.0, O=16.0)
პასუხი
(C)
0.245g
14
Pure water can be made to boil at a temperature lower than 100°C by
პასუხი
(B)
decreasing the external pressure
15
At what temperature does the solubility of \(KNO_{3}\) equal that of \(NaNO_{3}\)?
პასუხი
(B)
20°C
16
When a salt is added to its saturated solution, the salt
პასუხი
(C)
precipitates and the solution remains unchanged
17
When substance X was added to a solution of bromine water, the solution became colourless. X is likely to be
პასუხი
(C)
propyne
18
The preferential discharge of ions during electrolysis is influenced by the
პასუხი
(C)
nature of the electrode
19
The valence electrons of \(_{12}Mg\) are in the
პასუხი
(A)
3s orbital
20
Stainless steel is an alloy comprising of
პასუხი
(C)
Fe, C and Ni
21
The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is \([N_{A} = 6.02 \times 10^{23}]\)
პასუხი
(A)
\(1.2 \times 10^{22}\)
22
The most suitable substance for putting out petrol fire is
პასუხი
(B)
carbon(IV) oxide
23
The following factors would contribute to environmental pollution except
პასუხი
(C)
photosynthesis
24
The position of equilibrium in a reversible reaction is affected by
პასუხი
(D)
change in concentration of the reactants
25
The diagram above illustrates a conical flask containing water and ice. Which of the following is correct about the diagram?
პასუხი
(B)
Energy is absorbed when the ice changes to water
26
Which of the following statements best explains the difference between a gas and a vapour?
პასუხი
(B)
Unlike gases, vapour can easily be condensed into liquids
27
Consider the following reaction equation: \(2HCl + Ca(OH)_{2} \to CaCl_{2} + H_{2}O\). What is the volume of 0.1\(moldm^{-3}\) HCl that would completely neutralize 25\(cm^{3}\) of 0.3\(moldm^{-3}\) Ca(OH)\(_{2}\)?
პასუხი
(A)
150\(cm^{3}\)
28
\(Cu\) and \(HNO_{3}\) are not suitable for preparing hydrogen gas because of their
პასუხი
(A)
reactivity and oxidation respectively
29
Which of the following CANNOT be an empirical formula?
პასუხი
(D)
\(N_{2}O_{4}\)
30
One of the criteria for confirming the purity of benzene is to determine its
პასუხი
(B)
boiling point
31
When chlorine is passed through a sample of water, the pH of the water sample would be
პასუხი
(A)
< 7
32
How many atoms are contained in 0.2moles of nitrogen? \([N_{A} = 6.02 \times 10^{23}]\)
პასუხი
(A)
\(1.20 \times 10^{23}\)
33
The strength of metallic bonds depends on the
პასუხი
(C)
number of valence electrons
34
When zinc is added to AgNO\(_{3}\) solution, crystals of silver forms on the zinc surface. This indicates that zinc is
პასუხი
(A)
oxidised
35
The empirical formula of a compound containing 0.067mol Cu and 0.066mol O is [Cu = 63.5, O = 16]
პასუხი
(B)
\(CuO\)
36
The change in the oxidation state of iron in the reaction represented by the equation: \(2FeCl_{3} + H_{2}S \to 2FeCl_{2} + 2HCl + S\) is
პასუხი
(C)
+3 to +2
37
Which of the following methods can be used to seperate blood cells from plasma?
პასუხი
(A)
Centrifugation
38
Which of the following statements is true about ionic radius? Ionic radius
პასუხი
(B)
decreases as nuclear charge increases
39
Analysis of a hydrocarbon shows that it contains 0.93g of Carbon per gram of the compound. The mole ratio of carbon to hydrogen in the compound is [H = 1.0, C=12.0]
პასუხი
(A)
1:1
40
The law of definite proportions states that
პასუხი
(A)
pure samples of the same compound contain the same elements combined in the same proportion by mass
41
What is the relative molecular mass of a compound which has empirical formula \(CH_{2}O\)? [C= 12, H= 1, O= 16]
პასუხი
(D)
180
42
Atoms are electrically neutral because they
პასუხი
(B)
contain equal number of protons and electrons
43
Common Salt (NaCl) is used to preserve foods. Which of the following properties can be used to determine its purity before use?
პასუხი
(B)
Melting point
44
Which of the following electron configurations represents the transition element Chromium \(_{24}Cr\)?
პასუხი
(D)
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
45
The atomic number of an isotope of hydrogen is equal to its mass number because it
