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WorksheetsRSS CHEMISTRY
Total questions: 50
Worksheet time: 30mins
The number of protons in an atom is called its
Atomic number
Mass number
Neutron number
Electron number
Isotopes of an element differ in their
Atomic number
Mass number
Chemical properties
Physical properties
Which of these elements is a noble gas?
(a)
Across a period in the periodic table, ionization energy generally
decreases
increases
remains constant
varies unpredictably
The element with electronic configuration 2,8,1 belongs to group
(a)
The number of atoms in 12 g of carbon-12 is
A
B
C
D
How many moles of CO₂ are present in 44 g?
A
B
What is the molar mass of CaCO₃?
A) 100.09 g/mol
B) 98.00 g/mol
C) 100.09 g/mol
D) 120.00 g/mol
If 2 moles of H₂ react with O₂, how many moles of H₂O are formed?
1 mole
2 moles
3 moles
4 moles
11.2 dm³ of gas at STP corresponds to
A
B
C
D
The bond formed between Na⁺ and Cl⁻ in NaCl is
Ionic
Covalent
Metallic
Which molecule contains a triple bond?
A
B
C
D
Diamond and graphite are allotropes of carbon because they
A
B
C
D
Which type of bond is present in NH₃?
Ionic bond
Covalent bond
Metallic bond
Hydrogen bond
Hydrogen bonding is strongest in
A
B
C
D
Boyle’s law states that at constant temperature, pressure is
inversely proportional to volume
directly proportional to volume
constant
none of the above
Which of these is not an ideal gas assumption?
The pressure of a gas doubles when its volume is halved at constant temperature.
(a)
What is the SI unit of pressure?
Pascal
Bar
Atmosphere
Torr
At 273 K and 1 atm, 22.4 dm³ of any gas contains
(a)
A reaction that releases heat to the surroundings is called
Endothermic
Exothermic
Isothermal
Adiabatic
The standard enthalpy change of neutralization is always
Always positive
Always negative
Depends on the acid and base
Varies with temperature
The energy needed to start a chemical reaction is called
Activation Energy
Catalyst
Enthalpy
Entropy
In an endothermic reaction, ΔH is
(a)
Which of the following is an exothermic process?
A
B
C
D
Increasing temperature generally
A catalyst increases reaction rate by
A. Decreasing the activation energy
B. Increasing the frequency of collisions
C. Providing an alternative reaction pathway
D. None of the above
At equilibrium, forward and backward reactions occur
(a)
Le Chatelier’s principle predicts that increasing pressure favours
A
B
C
D
The unit of rate of reaction is
A
B
C
D
Which of these is a strong acid?
A
B
C
D
An acid reacts with a base to form
(a)
Which indicator is suitable for a strong acid–strong base titration?
(a)
A base that is soluble in water is called
(a)
The pH of 0.001 M HCl solution is approximately
(a)
In electrolysis, the electrode where oxidation occurs is the
Anode
Cathode
During electrolysis of acidified water, the gas evolved at the cathode is
Hydrogen
Oxygen
Chlorine
Nitrogen
Which metal is extracted by electrolysis of its molten ore?
Aluminum
Copper
Iron
Zinc
The standard electrode potential of hydrogen is defined as
(a)
Electroplating is used to
(a)
The general formula of alkanes is
C_nH_{2n+2}
C_nH_{2n}
C_nH_{2n-2}
C_nH_{2n+1}
The simplest alkene is
A
B
C
D
Ethanol can be produced by fermentation of
(a)
Which compound gives a sooty flame?
A
B
C
D
The functional group in carboxylic acids is
C
C=O
-COOH
-OH
The major ore of aluminium is
(a)
Which gas is responsible for acid rain?
A
B
Stainless steel is an alloy of
Iron
Copper
Aluminum
Nickel
The main raw materials for the Solvay process are
(a)
Petroleum is separated into fractions by
Distillation
Filtration
Evaporation
Centrifugation
