S2T8:
Which of the following compounds is NOT suitable to be used as a salt bridge in a chemical cell?
Which of the following compounds is NOT suitable to be used as a salt bridge in a chemical cell?
Final Results
8%
A. KCl(aq)
8%
B. NaCl(aq)
26%
C. NaNO₃(aq)
58%
D. CuSO₄(aq)
S2T8:
The same quantity of electricity is passed through 2 electrolytic cells containing NaCl(aq) (Cell 1) & NaOH(aq) (Cell 2) respectively.What is the mole ratio of the gas formed at the anode of Cell 1 to Cell 2?Which of Faraday's laws is demonstrated?
The same quantity of electricity is passed through 2 electrolytic cells containing NaCl(aq) (Cell 1) & NaOH(aq) (Cell 2) respectively.What is the mole ratio of the gas formed at the anode of Cell 1 to Cell 2?Which of Faraday's laws is demonstrated?
Final Results
29%
A. 1:2. Faraday's second law
38%
B. 2:1. Faraday's second law
14%
C. 1:2. Faraday's first law
19%
D. 2:1. Faraday's first law
Given:
E° of Cu²⁺/Cu = +0.34 V
E° of Zn²⁺/Zn = -0.76 V Which of the following statements is correct?
E° of Cu²⁺/Cu = +0.34 V
E° of Zn²⁺/Zn = -0.76 V Which of the following statements is correct?
Final Results
11%
A. The cell notation is written as Cu(s)|Cu²⁺(aq)||Zn²⁺(aq)|Zn(s)
31%
B. The reducing power of Zn²⁺(aq) is higher than that of Cu²⁺(aq)
28%
C. The reaction between Cu and Zn²⁺ is a spontaneous redox reaction
31%
D. The electromotive force of the cell decreases when the [Zn²⁺] increases
S2T9:
Which of the following elements form oxides that are insoluble in water?
I. Si II. Be III. Al IV. C
Which of the following elements form oxides that are insoluble in water?
I. Si II. Be III. Al IV. C
Final Results
16%
A. II
36%
B. I, III
36%
C. I, II, III
13%
D. I, II, III, IV
S2T9:
Which of the following elements does not react with oxygen when heated?
Which of the following elements does not react with oxygen when heated?
Final Results
19%
A. Silicon
49%
B. Chlorine
18%
C. Aluminium
14%
D. Phosphorus
S2T9:
Which of the following elements reacts with water to produce a bleaching agent?
Which of the following elements reacts with water to produce a bleaching agent?
Final Results
2%
A. Phosphorus
83%
B. Chlorine
8%
C. Sulphur
7%
D. Sodium
S2T9:
Which of the following oxides has the highest melting point?
Which of the following oxides has the highest melting point?
Final Results
8%
A. Na₂O
23%
B. MgO
64%
C. SiO₂
5%
D. Cl₂O₇
S2T9:
Which of the following elements has the highest melting point?
Which of the following elements has the highest melting point?
Final Results
18%
A. Mg
21%
B. Al
52%
C. Si
9%
D. P
S2T9:
X is a Period 3 element. One of its oxides is soluble in water and forms the strongest acid among those produced by Period 3 oxides. What is X?
X is a Period 3 element. One of its oxides is soluble in water and forms the strongest acid among those produced by Period 3 oxides. What is X?
Final Results
4%
A. Silicon
33%
B. Sulphur
52%
C. Chlorine
11%
D. Phosphorus
S2T9:
X is a Period 3 element. It reacts slowly with oxygen at high temperature to form an oxide that is insoluble in water. The oxide can react with hot sulphuric acid. Which of the following statements is true?
X is a Period 3 element. It reacts slowly with oxygen at high temperature to form an oxide that is insoluble in water. The oxide can react with hot sulphuric acid. Which of the following statements is true?
Final Results
35%
A. X is aluminium
13%
B. X forms two stable oxides.
23%
C. X can act as a reducing agent.
29%
D. The oxide of X has the highest melting point among the oxides of Period 3 elements.
S2T10:
Group 2 elements are known as:
Group 2 elements are known as:
Final Results
14%
A. Alkali metals
79%
B. Alkaline earth metals
1%
C. Transitions metals
6%
D. None of the above
S2T10:
Which of the following compounds is thermally the most stable?
Which of the following compounds is thermally the most stable?
Final Results
27%
A. Beryllium carbonate
12%
B. Beryllium hydroxide
4%
C. Beryllium nitrate
57%
D. Beryllium oxide
Pre-S1:
Which of the following statements is NOT true?
Which of the following statements is NOT true?
Final Results
12%
A. Proton, electron and neutron are fundamental particles of an atom.
42%
B. All atoms have protons, electrons and neutrons.
9%
C. Atom donates electron to form a cation.
37%
D. An anion has fewer protons than electrons.
Pre-S1:
Different atoms of an element that have the same number of protons but different numbers of neutrons are called....?
Different atoms of an element that have the same number of protons but different numbers of neutrons are called....?
Final Results
8%
A. isomers
88%
B. isotopes
3%
C. allotropes
1%
D. nuclides
Pre-S1:
Different crystalline forms of the same element in the same physical state are known as...
Different crystalline forms of the same element in the same physical state are known as...
Final Results
20%
A. isomers
8%
B. isotopes
71%
C. allotropes
0%
D. nuclides
S2T10:
Which of the following Group 2 carbonates has the highest decomposition temperature?
Which of the following Group 2 carbonates has the highest decomposition temperature?
Final Results
50%
A. BaCO₃
23%
B. BeCO₃
10%
C. CaCO₃
17%
D. MgCO₃
S2T9:
X is a Period 3 element that burns slowly in oxygen with a blue flame. Which of the following is not true?
X is a Period 3 element that burns slowly in oxygen with a blue flame. Which of the following is not true?
Final Results
26%
A. X forms two oxides: XO₂ and XO₃.
12%
B. An atom of X has two unpaired electrons.
12%
C. The simple ion of X has a 2- charge.
51%
D. The melting point of X is lower than that of phosphorus.
S2T9:
Which of the following elements does not form oxides?
Which of the following elements does not form oxides?
Final Results
24%
A. Chlorine
8%
B. Beryllium
67%
C. Argon
0%
D. Silicon
S2T9:
Which of the following compounds can react with both H⁺(aq) and OH⁻(aq)?
Write the chemical equations for the reactions in the comment section.
Which of the following compounds can react with both H⁺(aq) and OH⁻(aq)?
Write the chemical equations for the reactions in the comment section.
Final Results
10%
A. MgO
4%
B. Cl₂O₇
82%
C. Al₂O₃
4%
D. P₄O₁₀
Pre-S1:
What is the name of the ion with the formula S²⁻?
What is the name of the ion with the formula S²⁻?
Final Results
8%
A. Sulphur ion
21%
B. Sulphate ion
61%
C. Sulphide ion
10%
D. Sulphite ion