Question 1.With the help of an example explain what happens when a base reacts with a non- metallic oxide. What do you infer about the nature of non-metal oxide? (Board Term I, 2017)Answer:Oxides of non-metals react with bases to form salt and water. For example, the reaction between carbon dioxide and calcium hydroxide. Calcium hydroxide, …
Important Questions of Acids Bases and Salts Class 10 Science Chapter 2 Read More »
Question 1.Identify ‘x’, ‘y’ and ‘z’ in the following reaction : (a) x = gas; y = reaction condition; z = gas(b) x = solid; y = liquid; z = gas(c) x = number of moles of KClO3; y = reaction condition; z = number of molecules of oxygen(d) x = physical state of KClO3 and …
Important Questions of Chemical Reactions and Equations Class 10 Science Chapter 1 Read More »
Question 1.Newly formed DNA copies may not be identical at times. Give one reason. (AI2017)Answer:When a cell reproduces, DNA replication occurs which results in formation of two similar copies of DNA. The process of copying the DNA leads to some variations each time. As a result, the DNA copies produced are similar to each other …
Important Questions of How Do Organisms Reproduce Class 10 Science Chapter 8 Read More »
Chapter 11, Work and Energy, Class 9, CBSE, Notes, Science
Previous year questions, Ray Optics, Class 12, CBSE, Physics, Chapter 9 Ray Optics and Optical Instruments Class 12 Important Questions Very Short Answer Type Question 1.Aglasslensof refractive index 1.5 is placed in a trough of liquid. What must be the refractive index of the liquid in order to mark the lens disappear? (Delhi 2008)Answer:In order …
Previous year questions, Ray Optics, Class 12, CBSE, Physics, Chapter 9 Read More »
Chapter 4, Structure of Atom, Class 9, Science, CBSE
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