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Explain why: Al utensils should not...

Explain why:
Al utensils should not be kept in water over night.

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OMEGA PUBLICATION-SAMPLE QUESTION PAPER -III (PUNJAB)-QUESTION
  1. Calculate mass of 10^20 atoms of oxygen.

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  2. What raw materials are needed for a plant to get the process of photos...

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  3. Explain why: Al utensils should not be kept in water over night.

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  4. Explain why Al wire is used to make transmission cables.

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  5. Distinguish between classical and photochemical smogs.

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  6. Define disproportionisation and simple displacement redox reactions.

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  7. Why do aldehydes and ketones have high dipole moments?

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  8. C Cl4 is not hydrolysed but SiCl4 can be hydrolysed with water. Why ?

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  9. Derive van der Waals’ equation of State for n moles of gas.'

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  10. Calculate the kinetic energy of 0.2 g of H2 at 27^@C.

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  11. Calculate enthalpy of the reaction : 4NH3(g) +3O2(g) rarr 2N2(g)+ 6H2O...

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  12. Explain Le Chatelier’s principle.

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  13. BF3 acts as a Lewis acid. Why ?

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  14. Can you prepare a solution having pH more than 14 ?

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  15. Write IUPAC name of the following compunds

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  16. Write IUPAC name of the following compunds

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  17. Why tirtary carbocations are more stable than, secondary and primary c...

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  18. Give the chemistry of Solvay process for the manufacture of Na(2)CO(3)...

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  19. Group 2 elements are denser and harder than group 1 elements. Why ?

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  20. What is isotopic effect?

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