How many grams of oxygen can be prepared by the decomposition of 12 g of mercury (II) oxide? ( Atomic mass: Hg = 200 g/mol, oxygen= 16 g/mol.)
Anonymous Quiz
7%
0. 18 g
41%
12. 26 g
28%
0. 434 g
24%
0. 88 g
Which of the following defines an arithmetic sequence?
Anonymous Quiz
13%
A sequence in which each term is obtained by multiplying the previous term by a constant value.
74%
A sequence in which the difference between consecutive terms is constant.
7%
A sequence in which each term is the square of its position number.
7%
A sequence in which the ratio between consecutive terms is constant.
❤1
Given the sequence:
1, 6, 11, 16, 21, ...
What is the sum of the first 20 terms of the sequence?
1, 6, 11, 16, 21, ...
What is the sum of the first 20 terms of the sequence?
Anonymous Quiz
17%
1050
15%
1070
52%
970
15%
910
🥰3
Congratulations to all remedial students who completed the exam! We wish you the best results!
🎉🎉🎉🎉
🎉🎉🎉🎉
🥰6❤3
All of the following are the preconditions that needed for a chemical reaction to occur except___________.
Anonymous Quiz
10%
Collisions between reactants
17%
Proper orientation
11%
Activation energy
61%
Temperature
Sodium and calcium react with water to form hydrogen gas and metal hydroxide. Yet calcium reacts at a moderate, whereas sodium reacts so rapidly. Why do these differences occur? This is due to the difference in:
Anonymous Quiz
12%
Temperature
20%
Surface area of the reactants
58%
Nature of the reactants
10%
Concentration of reactants
❤1
What is oxidation?
Anonymous Quiz
75%
It is a process in which an atom loses an electron.
10%
It is a process in which an atom gains an electron.
6%
It is a process in which an atom decreases its oxidation number.
9%
It is a process in which an atom gains an electron and therefore increases its oxidation number.
Which of the following statement is true about alkane and alkene?
Anonymous Quiz
71%
Alkanes are saturated hydrocarbo, whereas alkenes are unsaturated hydrocarbons.
16%
Alkanes are unsaturated hydrocarbon, whereas alkenes are saturated hydrocarbons.
11%
Both alkanes and alkenes are saturated hydrocarbons.
1%
Both alkanes and alkenes are unsaturated hydrocarbons.
The most common reaction that alkene undergo is:
Anonymous Quiz
16%
Elimination
22%
Substitution
50%
Addition
12%
Decomposition
Which one of the following is NOT the propertie of acidic oxides?
Anonymous Quiz
54%
Acidic oxides react with acid to form salt and water.
18%
Acidic oxides desolve with water to form acid.
16%
Acidic oxides react with basic oxides to form salt.
13%
Acidic oxides react with bases to form salt and water.
👍1
Based on the degree of ionization of in aqueous solution both acid and base are classified:
Anonymous Quiz
24%
Dilute and concentrated
67%
Strong and weak
9%
Concentrated and weak
1%
None of above
❤2💯2
Which of the following defines the pH?
Anonymous Quiz
15%
It is the positive logarithm of hydronium ion concentration.
57%
It is the negative logarithm of hydronium ion concentration.
18%
It is the positive logarithm of hydroxide ion concentration.
10%
It is the negative logarithm of hydroxide ion concentration.
🙏2
Which of the following is NOT properties of bases?
Anonymous Quiz
2%
Soluble bases change the colour of indicators.
11%
Bases have a bitter taste.
13%
Aqueous solutions of bases conduct electricity.
74%
Bases have sour taste.
👏5
Which one of the following bases is used to remove soil acidity?
Anonymous Quiz
16%
Sodium hydroxide
24%
Potassium hydroxide
33%
Calcium hydroxide
27%
Ammonia
🥰4
Salts that absorb water from the atmosphere but remain solid are known as ___.
Anonymous Quiz
20%
Deliquescent salts
19%
Efflorescent salts
51%
Hygroscopic salts
10%
Soluble salts
🔥4
Sodium hydroxide is added to solution M. A reddish-brown precipitate is formed, solution M contains:
Anonymous Quiz
10%
Iron(II) ions
53%
Iron (III) ions
27%
Copper (II) ions
9%
Silver (I) ions
❤2
What mass of aluminum is deposited electrolytically in 30 minutes by a current of 40A ?
Anonymous Quiz
25%
0.672
39%
6. 71
23%
16. 12
13%
0.061
Which one of the following is not considered as addition polymerisation?
Anonymous Quiz
13%
Teflon
20%
Polypropylene
44%
Nylons
23%
Natural rubber
Which one of the following polymerization is correctly matched with its monomer?
Anonymous Quiz
7%
Cellulose ---- amino acid
12%
Protein ---- glucose
68%
Polystyrene ---- styrene
13%
Polypropylene ---- vinyl chloride