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Chemistry MCQs | Objective Type Questions | MCQs SET-3
1.Which of the following sub-atomic particle accompanies an electron emission in Beta–decay?
Correct Answer: A [antineutrino]
Notes:
The emission of electron in β−decay is accompanied by the emission of an antineutrino (ν ) and in β+ decay, a neutrino (ν) is generated.
The emission of electron in β−decay is accompanied by the emission of an antineutrino (ν ) and in β+ decay, a neutrino (ν) is generated.
2.Upto which element the Law of Octaves was found to be applicable?
Correct Answer: B [Calcium]
Notes:
It was found that the Law of Octaves was applicable only upto calcium. After calcium, every eighth element did not possess properties similar to that of the first element.
It was found that the Law of Octaves was applicable only upto calcium. After calcium, every eighth element did not possess properties similar to that of the first element.
3.What happens to the effective nuclear charge as we move from left to right in the periodic table?
Correct Answer: A [It increases]
Notes:
The effective nuclear charge of an element increases as we move from left to right in the periodic table.
The effective nuclear charge of an element increases as we move from left to right in the periodic table.
4.Choose the correct statement about d-block elements:
Correct Answer: B [All of them are metals]
Notes:
d-block elements are the elements of Group 3 to 12 in the centre of the Periodic Table. All of them are metals. These are characterised by the filling of inner d orbitals by electrons.
d-block elements are the elements of Group 3 to 12 in the centre of the Periodic Table. All of them are metals. These are characterised by the filling of inner d orbitals by electrons.
5.In which of the following pairs is the repulsion greatest as per the VSEPR Theory?
Correct Answer: A [lone pair – lone pair]
Notes:
The repulsion of a lone pair of electrons for another lone pair is greater than that between a bond pair and a lone pair which in turn is greater than that between two bond pairs. The correct order of repulsive force is as: lone pair – lone pair > lone pair – bond pair > bond pair – bond pair.
The repulsion of a lone pair of electrons for another lone pair is greater than that between a bond pair and a lone pair which in turn is greater than that between two bond pairs. The correct order of repulsive force is as: lone pair – lone pair > lone pair – bond pair > bond pair – bond pair.
6.Which of the following gas is liberated when a metal reacts with an acid?
Correct Answer: B [Hydrogen]
Notes:
The metal displaces hydrogen from the acids. This is seen as hydrogen gas. The metal combines with the remaining part of the acid and forms a compound called a salt.
The metal displaces hydrogen from the acids. This is seen as hydrogen gas. The metal combines with the remaining part of the acid and forms a compound called a salt.
7.Choose the correct statement:
Correct Answer: C [Both a and b]
Notes:
The chemical reaction between an acid and a base to give a salt and water is known as a neutralisation reaction.
The chemical reaction between an acid and a base to give a salt and water is known as a neutralisation reaction.
8.Which of the following acts as anode in a mercury cell?
Correct Answer: B [zinc – mercury amalgam]
Notes:
Mercury cell consists of zinc – mercury amalgam as anode and a paste of HgO and carbon as the cathode. The electrolyte is a paste of KOH and ZnO. It is suitable for low current devices like hearing aids, watches, etc.
Mercury cell consists of zinc – mercury amalgam as anode and a paste of HgO and carbon as the cathode. The electrolyte is a paste of KOH and ZnO. It is suitable for low current devices like hearing aids, watches, etc.
9.As per Faraday’s Laws of Electrolysis, the amount of chemical reaction which occurs at any electrode during electrolysis proportional to which of the following?
Correct Answer: C [quantity of electricity passed through the electrolyte]
Notes:
As per Faraday’s 1st Law of Electrolysis, the amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte (solution or melt).
As per Faraday’s 1st Law of Electrolysis, the amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte (solution or melt).
10.What percentage of Human body is made up of carbon?
Correct Answer: B [18.5]
Notes:
Around 18.5% of Human body is made up of carbon. Carbon is the basic building block of most of the cells in the body. It helps with cellular respiration by which the human body releases energy stored in glucose.
Around 18.5% of Human body is made up of carbon. Carbon is the basic building block of most of the cells in the body. It helps with cellular respiration by which the human body releases energy stored in glucose.
