NCERT Solutions Class 10 Science Chapter 5 Periodic Classification Of Elements – Here are all the NCERT solutions for Class 10 Science Chapter 5. This solution contains questions, answers, images, explanations of the complete Chapter 5 titled Periodic Classification Of Elements of Science taught in class 10. If you are a student of class 10 who is using NCERT Textbook to study Science, then you must come across Chapter 5 Periodic Classification Of Elements. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification Of Elements in one place.
NCERT Solutions Class 10 Science Chapter 5 Periodic Classification Of Elements
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| Class | 10 |
| Subject | Science |
| Book | Science |
| Chapter Number | 5 |
| Chapter Name |
Periodic Classification Of Elements |
NCERT Solutions Class 10 Science chapter 5 Periodic Classification Of Elements
Class 10, Science chapter 5, Periodic Classification Of Elements solutions are given below in PDF format. You can view them online or download PDF file for future use.
Periodic Classification Of Elements
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Question & Answer
Q.1: Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
Ans : Only one triad of Dobereiner's triads exists in the columns of Newland’s octaves. The triad formed by the elements Li, Na, and K of Dobereiner's triads also occurred in the columns of Newlands' octaves. Dobereiner's triads Li Ca Cl Na Sr Br K Bal Newlands' octaves
Q.2: What were the limitations of Döbereiner’s classification?
Ans : Limitation of Dobereiner's classification: All known elements could not be classified into groups of triads on the basis of their properties.
Q.3: What were the limitations of Newlands’ Law of Octaves?
Ans : Limitations of Newlands' law of octaves: (i) It was not applicable throughout the arrangements. It was applicable up to calcium only. The properties of the elements listed after calcium showed no resemblance to the properties of the elements above them. (ii) Those elements that were discovered after Newlands' octaves did not follow the law of octaves. (iii) The position of cobalt and nickel in the group of the elements (F, Cl) of different properties could not be explained. (iv) Placing of iron far away from cobalt and nickel, which have similar properties as iron, could also not be explained.
Q.4: Use Mendeléev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, AI, Si, Ba.
Ans : K is in group 1. Therefore, the oxide will be \( \mathrm{K_{2}O} \). C is in group 4. Therefore, the oxide will be \( \mathrm{CO_{2}} \). A1 is in group 3. Therefore, the oxide will be \( \mathrm{AL_{2}O_{3}} \). Si is in group 4. Therefore, the oxide will be \( \mathrm{SiO_{2}} \). Ba is in group 2. Therefore, the oxide will be \( \mathrm{BaO} \).
Q.5: Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table? (any two)
Ans : Scandium and germanium
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