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In mono halogen substituted derivatives of benzene, what is the relationship between their common and IUPAC names?
The NCERT mentioned, 'For mono halogen substituted derivatives of benzene, common and IUPAC names are the same.'
Haloalkanes are generally represented by which homologous series formula?
According to the NCERT for alkyl halides: 'They form a homologous series represented by $C_nH_{2n+1}X$'.
Which of the following laws of chemical combination was NOT successfully explained by Dalton's Atomic Theory?
Dalton's theory could explain the laws of chemical combination including the Law of Conservation of Mass, Law of Constant Composition, and Law of Multiple Proportions. However, it could not explain the laws of gaseous volumes. (NCERT, Chapter: SOME_BASIC_CONCEPTS_OF_CHEMISTRY, Section 1.6)
According to Dalton's Atomic Theory, what is the fundamental nature of atoms during a chemical reaction?
Dalton's theory states that chemical reactions involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction. (NCERT, Chapter: SOME_BASIC_CONCEPTS_OF_CHEMISTRY, Section 1.6, Point 4)
When was Dalton's atomic theory first proposed on a firm scientific basis?
The atomic theory of matter was first proposed on a firm scientific basis by John Dalton, a British school teacher in 1808. (NCERT, Chapter: STRUCTURE_OF_ATOM)
Which of the following statements about atoms, as per Dalton's Atomic Theory, is INCORRECT?
Dalton's Atomic Theory regarded the atom as the ultimate indivisible particle of matter. The concept of atoms being made of sub-atomic particles like electrons, protons, and neutrons developed towards the end of the nineteenth and beginning of the twentieth century, which was a concept very different from that of Dalton. (NCERT, Chapter: STRUCTURE_OF_ATOM and SOME_BASIC_CONCEPTS_OF_CHEMISTRY, Section 1.6)
According to Dalton's Atomic Theory, how are compounds formed?
Dalton proposed that compounds are formed when atoms of different elements combine in a fixed ratio. (NCERT, Chapter: SOME_BASIC_CONCEPTS_OF_CHEMISTRY, Section 1.6, Point 3)
The limitations of Dalton's Atomic Theory include its inability to explain:
Dalton's atomic theory, while successful in explaining some laws, 'failed to explain the results of many experiments, for example, it was known that substances like glass or ebonite when rubbed with silk or fur get electrically charged.' It also could not provide the reason for combining of atoms, which was answered later by other scientists. The concept of isotopes was also not part of his initial theory. (NCERT, Chapter: STRUCTURE_OF_ATOM and SOME_BASIC_CONCEPTS_OF_CHEMISTRY, Section 1.6)
What was the initial understanding of the atom, as reflected in the Greek word 'a-tomio'?
The word ‘atom’ has been derived from the Greek word ‘a-tomio’ which means ‘uncut-able’ or ‘non-divisible’. (NCERT, Chapter: STRUCTURE_OF_ATOM)
Before Dalton, the ideas about the existence of atoms were primarily:
The existence of atoms has been proposed since the time of early Indian and Greek philosophers (400 B.C.). According to them, the continued subdivisions of matter would ultimately yield atoms which would not be further divisible. These earlier ideas were mere speculations and there was no way to test them experimentally. (NCERT, Chapter: STRUCTURE_OF_ATOM)
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