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WorksheetsFIRST TERM CLASS 9 CHEMISTRY
Total questions: 20
Worksheet time: 16mins
The scientist known as the Father of Electricity is
Sir Humphry Dav
Ernest Rutherford
John Dalton
Michael Faraday
An atom is electrically neutral because of the presence of equal number of
Protons and neutrons
Protons and electrons
Electrons and neutrons
All of these
The mass number of an element is the number of
Electrons and neutrons
Protons
Protons and electrons
Protons and neutrons
The atomic number of an element is 17 and its mass number is 35,
it has 18 protons
has 17 neutrons
has 18 neutrons
has 18 electrons
The isotope used as a fuel in atomic reactors is
Cobalt-60
Iodine-131
Carbon-14
Uranium-235
Which of the following electronic configurations is a stable structure?
2, 8, 6
2, 8, 8
2, 8, 7
2. 7
The chemical bonding formed by the sharing of electrons is
Ionic bonding
Covalent bonding
Co-ordinate bonding
Metallic bonding
Which of the following is not a property of ionic bonding?
Found only in the solid state.
Conducts electricity in molten and aqueous states
Soluble in organic solvents
High melting and boiling points
The type of chemical bond in a nitrogen molecule is
Ionic bond
Triple covalent bond
Double covalent bond
Single covalent bond
Which of the following is a polar molecule?
HCl
N2
H2
NaCl
The electronegativity of Carbon = 2.55 and that of Cl = 3.16. Then the type of chemical bond present in CCl4 (Carbon tetrachloride) is
Ionic bond
Covalent bond
Metallic bond
Co-ordinate bond
The number of electrons lost, gained or shared by an atom during a chemical reaction is its
Electronegativity
Valency
Oxidation number
Group number
The valency of an element Y is 2 and the formula of the compound is X2Y3. What is the valency of X?
2
1
3
0
xAl + yO2 --> 2Al2O3 is a balanced equation. Then the values of x and y are
x = 2 and y = 4
x = 4 and y = 3
x = 3 and y = 4
x = 2 and y - 2
The process of gain of electrons is called
Oxidation reaction
Reduction reaction
Redox reaction
Displacement reaction
2Na + Cl2 --> 2NaCl . Here Chlorine is the
Oxidised atom
Oxidising agent
Reducing agent
None of these
In the decomposition reaction of H2O2(Hydrogen peroxide), the negative catalyst used is
Sulphuric acid
Manganese dioxide
Phosphoric acid
Spongy iron
Mg ribbon, Mg powder, marble pieces, marble powder, dilute HCl, and conc: HCl are given to you. Which materials will you select to get more CO2 gas in less time?
Magnesium powder and Conc. HCl
Magnesium pieces and Conc. HCl
Marble powder and dilute HCl
Marble powder and Conc. HCl
When dilute hydrochloric acid is added to sodium thiosulphate and heated, ................... is formed.
a white precipitate
a yellow precipitate
a brown precipitate
a yellow coloured gas
The oxidation number of 'S' in H2SO4 is............
[ Hint: oxidation number of H = +1 ; O = − 2 ]
+ 2
+3
+6
− 6
