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Q. Define Elements and Compounds?
Pure substances are categorized into two categories that are elements and compounds. An element is a substance that can't be separated into simpler substances. Carbon, Oxygen, sulphur, aluminium, iron, and gold are elements. Above 110 elements are known but only 91 take place naturally on Earth. The residue have been created by scientists.
What is a salt bridge? Salt bridge is a device used to link two electrodes on electrochemical cell. It maintains electrical neutrality and internal continuity. It is shown by
What r the requirements for a good refractory material
Refining of petroleum: Petroleum (crude) extracted from earth's crust is an intimate mixture of many organic compounds. Crude petroleum needs to be purified and its components
The third line in Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen: (1) 5 → 3 (2) 5 → 2 (3) 4→ 3
does lowered pH of water affect dissolved oxygen?
The spectrum of He is expected to be similar to: (1) H (2) Li + (3) Na (4) He + Ans: Li +
preparation of silicides
IN AMMONIUM ION NITROGEN DOESNT HAVE VALENCE ELECTRONS IN ITS VALENCE ORBITAL.
If the water molecules in 1g of water were uniformly distributed on earth surface , how many such water molecules would there be in 1 cm^2 of earth? Solution) No. of molecules in
total metal in word
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