{"id":109002,"date":"2022-02-12T14:04:01","date_gmt":"2022-02-12T08:34:01","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=109002"},"modified":"2022-06-16T22:11:06","modified_gmt":"2022-06-16T16:41:06","slug":"periodic-classification-of-element-cbse-class-10-science-extra-questions","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/cbse\/class-10\/science\/periodic-classification-of-element-cbse-class-10-science-extra-questions\/","title":{"rendered":"Periodic Classification of Element \u2013 CBSE Class 10 Science \u2013 Extra Questions"},"content":{"rendered":"

Periodic Classification of Element \u2013 CBSE Class 10 Science \u2013 Extra Questions<\/span><\/strong><\/h2>\n

Topics and Subtopics in NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements<\/strong>:<\/strong><\/p>\n\n\n\n\n\n\n\n
Section Name<\/strong><\/td>\nTopic Name<\/strong><\/td>\n<\/tr>\n
5<\/td>\nPeriodic Classification Of Elements<\/td>\n<\/tr>\n
5.1<\/td>\nMaking Order Out Of Chaos \u2013 Early Attempts At The Classific Assification Of Tion Of Elements<\/td>\n<\/tr>\n
5.2<\/td>\nMaking Order Out Of Chaos \u2013 Mendel\u00e9ev\u2019S Periodic Table<\/td>\n<\/tr>\n
5.3<\/td>\nMaking Order Out Of Chaos \u2013 The Modern Periodic Table<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question-1<\/span><\/strong>
\nWhat are the merits and demerits of newland\u2019s classification?
\nSolution:<\/span><\/strong>
\nMerits
\n(i) This classification worked well for lighter elements only up to Ca.
\n(ii) This classification gave us a relation between the properties of the elements and their atomic masses.
\n(iii) It was shown by this classification for the first time that there exists a periodicity in the properties of the elements.
\nDemerits
\n(i) This classification failed when the heavier elements beyond Ca were arranged according to Newland\u2019s law of octaves.
\n(ii) At the time of this law, noble gases were unknown. When noble gases were discovered, neon (Ne) between F and Na, and argon (Ar) between Cl and K, it becomes the ninth element and not the eighth which has the similar properties.<\/p>\n

Question-2<\/span><\/strong>
\nX and Y are two elements having which have similar properties and obey Newland\u2019s land of octaves. How many elements are there in-between X and Y?
\nSolution:<\/span><\/strong>
\nThe law states there are eight elements in an octave (row). No of elements between X and Y is six.<\/p>\n

Question-3<\/span><\/strong>
\nWhat is achievement of Dobereiner\u2019s law of traids?
\nSolution:<\/span><\/strong>
\nThe law recognised the relation between atomic weight of an element and its chemical properties for the first time.<\/p>\n

Question-4<\/span><\/strong>
\nLithium, Sodium and potassium were put in the same group on the basis of their similar properties.
\ni) What is the similarity in their properties?
\nSolution:<\/span><\/strong>
\ni) Li, Na and K are very reactive alkali metals, which react with water with the formation of an alkali and hydrogen gas.<\/p>\n

Question-5<\/span><\/strong>
\nState two reasons for rejecting law of octaves.
\nSolution:<\/span><\/strong>
\n(i) The law did not extend properly beyond the element calcium.
\n(ii) The law did not provide any specific place for hydrogen.<\/p>\n

Question-6<\/span><\/strong>
\nName four alkaline earth metals. To which group do they belong?
\nSolution:<\/span><\/strong>
\nThe four alkaline earth metals are beryllium, magnesium, calcium and strontium. They belong to II A group.<\/p>\n

Question-7<\/span><\/strong>
\nWhat is called diagonal relationship?
\nSolution:<\/span><\/strong>
\nThe similarity in properties between certain elements of different periods placed diagonally to one another in a periodic table is called diagonal relationship.<\/p>\n

Question-8<\/span><\/strong>
\nDefine electron affinity.
\nSolution:<\/span><\/strong>
\nIt is defined as the amount of energy released in adding an extra electron to an isolated neutral gaseous atom in its lowest energy state, to convert it into gaseous ion. Electron affinity increases as one moves from left to right in periods or top to bottom in groups.<\/p>\n

Question-9<\/span><\/strong>
\nWhat is called electronegativity?
\nSolution:<\/span><\/strong>
\nThe property of atoms to attract electrons in a covalent bond is called electronegativity.
\n(i) In periods, electronegativity increases with the increase in atomic number.
\n(ii) In groups, electronegativity decreases with the increase in atomic number.<\/p>\n

Question-10<\/span><\/strong>
\n(a) Name an alkali metal other than lithium, sodium and potassium.
\n(b) Name an alkaline earth metals other than calcium, strontium and barium.
\n(c) Name one halogen other than chlorine, bromine and iodine.
\n(d) Name a non-metal having properties similar to carbon.
\n(e) Name a rare gas other than neon, krypton and xenon.
\nSolution:<\/span><\/strong>
\n(a) Rubidium
\n(b) Magnesium
\n(c) Fluorine
\n(d) Silicon
\n(e) Argon.<\/p>\n

Question-11<\/span><\/strong>
\nExplain why the following statements are not correct?
\ni) All groups contain both metals and non-metals
\nii) In group I, reactivity decreases with increases in atomic number
\niii) Elements in a period become more metallic with increasing atomic number
\niv) Atoms of elements in the same group have the same number of electrons.<\/p>\n

Solution:<\/span><\/strong>
\ni) All groups do not contain both metals and non-metals. Group I and II contain only metals.
\nii) In group I, reactivity increases with increase in atomic number. This is because as the size of the atoms increases, the valence shell electrons can be easily removed.
\niii) The metallic character decreases in a period with increase in atomic number. This is because across the period, the size of the atom decreases and the valence shell electrons are held more tightly.
\niv) In a neutral atom the number of electrons is equal to the number of protons. In a group the atomic number increases as we move down.<\/p>\n

Question-12<\/span><\/strong>
\nWhy are the elements sodium and chlorine in the same period of the Periodic table?
\nSolution:<\/span><\/strong>
\nThis is because the atoms of both the elements have three shells containing the electrons.<\/p>\n

For more visit Periodic Classification of Elements &#8211; Need and Significance<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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