"The Letter" is a touching story of Ali who is all alone and waits for his only daughter's letter for five long years. He receives th…
Mrs. Packletide's Tiger is a humorous story. The author makes fun of almost all the characters. Mrs. Packletide is an important character who wa…
1. Chemical reactions - Chemical changes or chemical reactions are the changes in which one or more new substances are formed. 2. Chemical Equa…
Most students think a lot about GPA in high school. There’s no doubt that GPA is one of the most important pieces of information colleges will …
He coloured deeply under his sunburn, then grew pale. Answer: The statement shows that the boys were shy. Nicola felt embarressed when the narrator …
Why was the author surprised to see Nicola and Jacopo working as shoeshine boys? Answer: During his first meeting with Nicola and Jacopo, the boys w…
Alloys cannot be separated by physical means, though it is considered mixture, Why? Alloys are homogeneous mixtures of metals and cannot be separate…
Why air is a mixture not a compound? Give reasons. Air is a mixture for of the following reasons: 1. Air does not have a fixed compositi…
NCERT What are suspensions? Explain with an example. Answer: A suspension is a heterogeneous mixture in which very fine particles (about 10-5 m size…
What are suspensions? Explain with an example. Answer: A suspension is a heterogeneous mixture in which very fine particles (about 10-5 m size) of …
What are the properties of a colloid? Answer: Properties of a colloid are: 1. Heterogeneous nature: Colloid or Sol is heterogeneous in nature i.e. …
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293K. Find its concentration at this temperature. Answer: …
What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures. Answer: Centrifugation works on the pr…
Q51: How crystallization is better than evaporation? Answer: The process of evaporation gives residue which may contain impurities. When there is re…
A boy buys common salt from the market which is contaminated with Ammonium Chloride (NH4Cl) and sand
A boy buys common salt from the market which is contaminated with Ammonium Chloride (NH4Cl) and sand. The procedure he should adopt to obtain pure N…
Which separation techniques will you apply for the separation of the following? (a) Sodium chloride from its solution in water. (b) Ammonium chloride…