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WorksheetsChemistry Self Assessment Quiz
Total questions: 51
Worksheet time: 31mins
A sample of orange is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?
decantation
chromatography
distillation
filtration
evaporation
Mixture of two miscible liquids with different boiling Points?
Decantation
Distillation
Evaporation
Filtration
Which of the following ions is isoelectric with neon? [₃Li, ₉F, ₁₀Ne, ₁₇Cl, ₁₉K]
Cl⁻
F⁻
K⁺
Li⁺
Which of the following pairs of species contains the same number of electrons? [₆C, ₈O, ₁₀Ne, ₁₁Na, ₁₂Mg, ₁₃Al, ₁₇Cl]
Mg²⁺ and Al³⁺
Cl⁻ and Ne
Na⁺ and Mg
C and O²⁻
When sodium atoms forms the ion Na+
It gains one electron
It gains one proton
It achieves a noble gas configuration
Its atomic number increases
Atoms are electrically neutral because they
Do not conduct electricity
Contain equal number of protons and electrons
Are composed of neutrons and electrons
Cannot be attracted by electromagnetic field
A hydrogen atom which has lost an electron contains
One proton only
One neutron only
One proton and one neutron
One proton, one electron and one neutron
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?
32
22
20
10
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (II) tetraoxosulphate (VI) solution according to the following equation? Zn(s) + CuSO₄(aq) ⟶ ZnSO₄(aq) + Cu(s) [Cu = 63.5, Zn = 65]
1.0mole
0.2moles
0.3moles
0.4moles
0.5moles
What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3g of the compounds? (Na₂CO₃ = 106)
0.05
0.10
0.20
0.500
2.00
How many mole of AgNO₃ are there in 500cm³ of 0.1M AgNO₃ solution?
0.005mole
0.05mole
0.5mole
1 mole
5mole
Given that 32.0g of sulphur contains 6.02 × 10²³ sulphur atoms, how many atoms are there in 2.70g of aluminium? [Al = 27, S = 32].
6.02 × 10²³
3.01 × 10²³
6.02 × 10²²
5.08 × 10²²
Given the symbol ₂₀𝑌⁴⁰, it can be deduced that Y has
60 neutrons
An atomic number of 20
A mass number of 600
40 electrons
The number of atoms present in 2.5moles of triatomic gas is equivalent to [1 mole = 6.02 × 10²³].
2.5 × 10²³
1.5 × 10²³
1.5 × 10²⁴
2.5 × 10²⁴
The number of particles in one mole of a chemical compound is
Atomic number
Avogadro's number
Mass number
Oxidation number
An element X has two isotopes of ₁₀X²⁰ and ₁₀X²² in the ratio of 1:3, what is the relative atomic mass of X.
Find the number of neutrons in an atom represented by ₂₁X⁴⁵
21
24
45
66
Which of the following is suitable for determining different isotopes present in an element which exhibits isotopy?
Sensitive weighing balance
Cathode ray tubes
Mass spectrometer
Geiger Muller counter
The compound formed by two elements X and Y with the electronic configuration 1s² 2s² 2p⁴ and 1s² 2s² 2p⁶ 3s² respectively is
XY
YX
X₂Y₃
Y₂X₃
Consider the reaction represented by the following equation: xKMnO₄(aq) + ySO₂(g) + 2H₂O(l) → K2SO₄(aq) + zMnSO₄(aq)+ 2H₂SO₄(aq). Identify x, y and z respectively.
2, 5, and 2
2, 2 and 5
5, 1 and 2
1, 5 and 2
The formula of mercury (I) dioxonitrate (III) is
Hg(NO₃)₂
Hg(NO₂)₂
HgNO₂
Hg₂NO₂
The formulae of the compound formed between a trivalent metal, M and divalent non-metal Y is.
M₂Y₃
M₂Y₂
MY
M₃Y
Consider the reaction represented by the following equation below: C₂H₂ + yH₂ ⟶ C₂H₆ The value of y in the reaction is
4
3
2
1
What is the molecular formula of a compound whose empirical formula is CH₂O and molar mass is 180? [H = 1, C = 12, O = 16]
C₄H₈O₂
C₄H₈O₃
C₆H₁₀O₅
C₆H₁₂O₆
What is the empirical formula of a hydrocarbon containing 0.08moles of carbon and 0.32moles of hydrogen?
CH2
CH₃
CH₄
C₂H₄
If an element X with atomic number 13 combine with an element Y whose atomic number is 8, the most likely formulae of the compound formed between X and Y is
XY₂
X₂Y
X₃Y₂
X₂Y₃
If the valencies of two elements X and Y are 2 and 3 respectively, write down the formula of their combination
X₄Y₂
X₂Y
X₃Y₂
X₂Y₃
The oxidation number of X in (XO₄)³⁻ is
+1
+3
+4
+5
The oxidation number of nitrogen in Pb(NO₃)₂ is.
+2
+3
+4
+5
How many protons are there in a metallic ion (X³⁺) which has inert gas structure and contains 10 electrons?
3
7
10
13
What is the amount of magnesium that would contain 1.20 × 10²⁴ particles? [Mg = 24, Avogadro's constant = 6.02 × 10²³].
0.5moles
2.0moles
12.0moles
24.0moles
Which of the following ions has the electronic configuration 2, 8, 8?
Na⁺
Mg²⁺
F⁻
Cl⁻
Which of the following noble gases has electronic structure similar to that of N in NH₃?
₂He
₁₀Ne
₁₈Ar
₁₉Kr
Which of the following species correctly represents an ion of M with 13 protons and 10 electrons?
₁₀M³⁺
₁₀M³
₁₃M³⁺
₁₃M⁻
If 100 atoms of element X contains 70 atoms of ₉X and 30 atoms of ₁₁X, calculate the relative mass of X.
What is oxidized in the reaction represented by the following equation? 3Cu + 8HNO₃ ⟶ 3Cu(NO₃)₂ + 2NO + 4H₂O
Oxygen
Hydrogen
Nitrogen
Copper
The oxidation number of phosphorus in [PO₄]³⁻ is
+1
+2
+3
+4
+5
₂ + 2NO + 4H₂O
Oxygen
Hydrogen
Nitrogen
Copper
The oxidation number of phosphorus in [PO₄]³⁻ is
+1
+2
+3
+4
+5
In the reaction represented by the following equation. 2H₂S(g) + SO₂(g) ⟶ 2H₂O(l) + 3S(s). SO₂ is acting as
A reducing agent
An oxidizing agent
A dehydrating agent
A bleaching agent
What volume of oxygen at s.t.p would react with carbon to form 4.40g of CO₂ according to the following equation? C(s) + O₂(g) ⟶ CO₂(g). [O = 16; C = 12; 1 mole of a gas occupies 22.4dm³ at s.t.p]
0.224dm³
2.24dm³
4.40dm³
4.48dm³
The volume of 1.00moldm⁻³ HCl(aq) required to dissolve completely 6.54g of zinc granules is [Zn = 65.4]
0.100dm³
0.2000dm³
0.224dm³
0.654dm³
If 200cm³ of a gas at s.t.p has a mass of 0.268g. What is its molar mass? (Molar volume of a gas at s.t.p = 22.4dm³
300g
200g
150g
30g
The decomposition of hydrogen peroxide is represented by the equation: 2H₂O₂(l) ⟶ 2H₂O(l) + O₂(g). What mass of hydrogen peroxide would be required to produce 22.4dm³ of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p = 22.4dm³)
18g
34g
36g
68g
[NH₄]⁺ is formed from NH₃ and H⁺ by
Covalent bonding
Dative bonding
Hydrogen bonding
Ionic bonding
What is responsible for metallic bonding?
Attraction between the delocalized electrons and fixed positive lattice points (cations)
Attraction between positive and negative ions.
Sharing of electrons between the metal atoms.
Transfer of electrons from one atom to another.
Which of the following compounds has hydrogen bonds between its molecules?
HF
HBr
HCl
HI
Water molecules are held together by
Covalent bond
Hydrogen bond
Ionic forces
Van der Waals forces
Which of the following arrangements represents the correct order of electronic energy level?
1s 2p 2s 3p 3d 4s
1s 2s 2p 3s 3p 3d 4s
1s 2s 2p 3s 3p 4s 3d
1s 2s 3s zp 3p 4s 3d
Atomic orbital is
The circular path through which electrons revolve round the nucleus
A region round the nucleus where electrons are most likely to be found
The path around the nucleus through which protons move
None of the above.
The oxidation number of sulphur in +4 in
Na₂S₂O₃
H₂SO₃
H₂SO₄
SO₃
