NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification Of Elements

Did you find NCERT Solutions Class 10 Science chapter 5 Periodic Classification Of Elements helpful? If yes, please comment below. Also please like, and share it with your friends!

NCERT Solutions Class 10 Science chapter 5 Periodic Classification Of Elements- Video

You can also watch the video solutions of NCERT Class10 Science chapter 5 Periodic Classification Of Elements here.

Video – will be available soon.

If you liked the video, please subscribe to our YouTube channel so that you can get more such interesting and useful study resources.

Download NCERT Solutions Class 10 Science chapter 5 Periodic Classification Of Elements In PDF Format

You can also download here the NCERT Solutions Class 10 Science chapter 5 Periodic Classification Of Elements in PDF format.

Click Here to download NCERT Solutions for Class 10 Science chapter 5 Periodic Classification Of Elements

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 

NCERT / CBSE Book for Class 10 Science

You can download the NCERT Book for Class 10 Science in PDF format for free. Otherwise you can also buy it easily online.

• Click here for NCERT Book for Class 10 Science
• Click here to buy NCERT Book for Class 10 Science

All NCERT Solutions Class 10

• NCERT Solutions for Class 10 English
• NCERT Solutions for Class 10 Hindi
• NCERT Solutions for Class 10 Maths
• NCERT Solutions for Class 10 Science
• NCERT Solutions for Class 10 Social Science
• NCERT Solutions for Class 10 Sanskrit

All NCERT Solutions

You can also check out NCERT Solutions of other classes here. Click on the class number below to go to relevant NCERT Solutions of Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

Download the NCERT Solutions app for quick access to NCERT Solutions Class 10 Science Chapter 5 Periodic Classification Of Elements. It will help you stay updated with relevant study material to help you top your class!