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Lamp black is manufactured when tar and vegetable oils (rich in carbon) are burnt in an insufficient supply of air and the resulting soot is deposited on wet blankets hung in a room. Lamp black is a velvety black powder. It is used in the manufacture of Indian ink, pr..

Mainly distributed in Maharastra, Madhya Pradesh, parts of Gujarat, Andhra, Tamil Nadu and Karnataka. They are the products of weathering of deccan trap. They can be deep black soils, clay loam soils, sandy clay soi..

Lamp Black is also known as Soot. Soot is obtained by the incomplete combustion of carbonaceous, fuels, especially oil fuels, in limited supply of air. The soot settles on the cooler parts of the chamber, and can be collected by scrapping it (Fig.10.5). It is used in the manufacture of pr..

Consider two bodies of equal surface areas suspended in a room. One of the bodies has a polished surface and the other is painted black. After sufficient time, the temperature of both the bodies are equal to the room temperature. As the surface areas of the bodies are the same, equal amou..

It is prepared by heating white phosphorus to about 470 K under high pressure of 1200 atmospheres in inert atmosphere. (i) It has metallic lustre. (ii) It is most inactive form of phosphorus. (iii) It has a layer type structure in which each layer consists of phosphorus atoms. Some ph..

There are some gray and some black buttons in the figure. Identify the ratio of gray buttons to black buttons. => 5 : 9 or 1 : 2 or 4 : 5 or 5 : 4..

There are 19 books on Geography, 16 books on Zoology and 20 books on Math in a bundle of books. Three books are selected one after the other. Find P(book on Zoology, book on Geography, no book on Math). => 2 321 or 152 ..

There are 6 drawing books and 15 work books in a school bag. A book is picked from the bag. Which book is least likely to be picked? => drawing book or work book or both are equally likely or none of the above..

Botanical survey of India publishes this book. This book provides information about plant species which are rare, endangered or endemic, but all of which are grown in botanical garden..

Estimate the perimeter of the cover of the book. => 98 cm or 238 cm or 190 cm or 138 cm..