Rising and setting of the sun at a given place is a
1. periodic change.
2. undesirable change.
3. physical change.
4. reversible change.
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The sun does not appear red during noon hours because the distance travelled by the sun rays in the atmosphere is less
D) Speed of light is constant when it has passed through medium for all colotus.
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Rising of dough with yeast depends on ……………… of sugars to carbon dioxide and water.
D) oxidation
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Give reason: Mendeleev’s periodic law was modified into modern periodic law.
Henry Moseley in 1913, studied X-ray spectra of large number of elements. He observed that the frequency of X-ray emitted from an element is related to atomic number (Z) of an...
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Explain how does the filling of electrons takes place in the modern periodic table across: i. Second period ii. Third period
i. Filling of electrons in the second period: In the second period, electrons are filled in the second shell i.e., n = 2. This shell can accommodate a maximum of eight electrons...
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i. Shortest period in the modern periodic table. ii. Block which is placed separately at the bottom of the modern periodic table.
i. First period ii. f-Block
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Outer electronic configurations of a few elements are given below. Explain them and identify the period, group and block in the periodic
i. 2He: 1s2 Here, n = 1. Therefore, 2He belongs to the 1st period. The shell n = 1 has only one subshell, namely 1s. The outer electronic configuration 1s2 of ‘He’ corresponds to the...
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According to Mendeleev’s periodic law, the physical and chemical properties of elements are the periodic function of their …………..
Correct option is: (A) atomic weights According to Mendeleev's periodic law, the Physical and Chemical properties of elements are the periodic function of their atomic weight
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According to Mendeleev’s periodic law, the physical and chemical properties of elements are the periodic function of their …………..
2 Answers
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Sublimation of Iodine is a (a) Chemical change (b) Physical change (c) Natural change (d) Undesirable change
(b) physical change
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How could the Modern periodic table remove various anomalies of Mendeleev’s periodic table?
The Modern periodic table removed various anomalies of Mendeleev’s periodic table as follows: i. All isotopes of the same element have different atomic masses but same atomic number. Therefore, they occupy...
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