Class 10th Questions and Answers

  NCERT Solutions for Class 10 Science Chapter 5 Periodic Classification of Elements (CBSE) Question 1 Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves ? Compare and find out. Answer: Yes, Dobereiner’s triads also existed in the columns of Newland’s Octaves. For example, Li, Na, K. If we consider lithium (Li) as the first element, then sodium (Na) is eighth element. If we consider sodium as the first element, then potassium is the eighth element. Question 2 What were the limitations of Dobereiner’s classification ? Answer: It failed to arrange all the then known elements in the form of triads of elements having similar chemical properties. Dobereiner could identify only three triads from the elements known that time. Question 3 What were the limitations of Newlands’ law of octaves ? Answer: (i) Newlands law of octaves was applicable to the classification of elements upto calcium only. After calcium every eighth element did not possess the properties similar to tha

                                        Money and credit Class 10th NCERT (cbse)                        Question 1:   In situations with high risks, credit might create further problems for the borrower. Explain? Answer: High-risk situations occur in rural areas because there the main demand for credit is for crop production which involves considerable costs on seeds, fertilisers, pesticides, water, electricity, repair of equipment. There is a minimum stretch of three of four months between the time when farmers buy these inputs and when they sell the crop. Farmers generally take crop loans at the beginning of the season and repay the loan after harvest. Repayment of the loan is crucially dependent on the income from farming. If a crop fails due to shortage of rain or for any other reason, a small farmer has to sell a part of the land to repay the loan. Failure of crops create further problems for the borrowers. Credit does not improve his earnings but leaves him worse off than before.