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Why are most carbon compounds poor conductors of electricity?
Concept: The Covalent Bond
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Concept: Extraction of Reactive Metals
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Concept: Extraction of Reactive Metals
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Concept: Physical Properties of Metals
A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.
Concept: Saturated and Unsaturated Carbon Compounds
Why are most carbon compounds poor conductors of electricity?
Concept: The Covalent Bond
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
Concept: Dobereiner’s Triads
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Concept: The Modern Periodic Table
Mention any two components of blood.
Concept: Respiration
Mention any two components of blood.
Concept: Respiration
Trace the movement of oxygenated blood in the body.
Concept: Respiration
Trace the movement of oxygenated blood in the body.
Concept: Respiration
Write the function of valves present in between atria and ventricles.
Concept: Blood Vessels
Write one structural difference between the composition of arteries and veins.
Concept: Blood Vessels
Name the basic filtration unit present in the kidney.
Concept: Excretion
Name the basic filtration unit present in the kidney.
Concept: Excretion
List the steps of preparation of temporary mount of a leaf peel to observe stomata.
Concept: Mode of Nutrition in Plant > Autotrophic Plants
Name one gustatory receptor and one olfactory receptor present in human beings.
Concept: Reflex and Reflex Action
