Q.What is qualitative analysis?
- The type of analysis that deals with the methods which are used to determine the constituents of a compound.
Q.What is a radical?
- A radical may be defined as an atom or group of atoms which carries charge and behaves as a single unit in chemical reactions.
Q.What are acidic and basic radicals?
- Radicals carrying positive charge are called basic radicals and those carrying negative charge are called acidic radicals.
Q.What type of bond is present in an inorganic salt?
- Electrovalent bond.
Q.Why do inorganic salts ionize when dissolved in water?
- Due to the high dielectric constant of water, the force of attraction holding the two ions in a salt decreases. Thus, the two ions separate. The ions are further stabilized by solvation.
Q.Give examples of some colored basic radicals.
- Cu2+, Fe2+, Fe3+, Cr3+, Ni2+, Co2+and Mn2+.
Q.What is the color of iron salts?
- Ferrous salts are usually light green while ferric salts are generally brown.
Q.Name any iron salt which is light green.
- Ferrous sulphate.
Q.What is the color of nickel salts?
- Bluish green or green.
Q.What is the color of manganese salts?
- Light pink or flesh color.
Q.Name the basic radicals which are absent, if the given salt is white.
- Cu2+, Fe2+, Fe3+, Cr3+, Ni2+, Co2+and Mn2+.
Q.Why a salt containing lead turn black in color, when placed for a long time in laboratory?
- Due to the formation of black lead sulphide by the action of H2S in atmosphere.
Q.Name the salts which produce crackling sound when heated.
- Lead nitrate, barium nitrate, potassium bromide, sodium chloride.
Q.What is sublimation?
- It is the process by which a salt directly changes into gaseous phase without melting, when heated. On cooling vapors condense back to the solid state.
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