The neutral atom’s two isotopes differ in the number of
1 Electron shells
2 Protons
3 Valence electrons
4 Neutrons
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The percentage of carbon is the least in 1 Grey cast iron 2 Wrought iron 3 White cast iron 4 Steel
Of the various forms of carbon, the one which is used for adsorption purpose, is 1 Diamond 2 Graphite 3 Coke 4 Wood charcoal
Which are the units of functioning in vssc?
The chemical used as a ‘fixer’ in photography is 1 Borax 2 Sodium thiosulphate 3 Sodium sulphate 4 Ammonium persulphate
Label the following types of erosion in order by their ability to transport materials. Wind erosion, water erosion, glacial erosion, plant/animal erosion.
Which of the following is called a strategic metal? 1 Silicon 2 Germanium 3 Titanium 4 Uranium
What is the Organic Evolution ?
Which of the following reactions is used for increasing the number of carbon atoms in a chain? 1 Substitution reaction 2 Wurtz reaction 3 Friedel – Crafts reaction 4 Cannizzaro’s reaction
Which of the following is a chemical change? 1 Oxidation 2 Reduction 3 Sublimation 4 Decomposition
A mixture of iron filings and sand can be separated by 1 Heating 2 Sublimation 3 Hand picking 4 Magnetic separation
why nitrogen is about 70%(i.e.)highest percentage in environment