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5 answers

Have given you several links hope they help
Good Luck!


http://www.icseguess.com/forum/forum_posts.asp?TID=877
http://www.stanford.edu/dept/SUSE/ICE/monographs/mohnot.pdf
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Open link for the rest
http://www.yuvajobs.com/education/icse/chemistry97/set1.asp
Q 1. (a) Answer the questions below, relating your answers only to salts in the following list :
Sodium Chloride, anhydrous calcium chloride, copper sulphate - 5- water.
(i) What name is given to the water in the compound copper sulphate - 5-water?


(ii) If copper sulphate -5 - water is heated, the water is driven off leaving anhydrous copper sulphate.


(A) What is the colour of anhydrous sulphate?
(B) By what means, other than heating, could you dehydrate copper sulphate -5-water and obtain anhydrous copper sulphate?


(iii) What is deliquescence ?


(iv) Which one of the salts in the given list is deliquescent ?


Q 1(b) State what you see when :
(i) a piece of moist blue litmus paper is placed in a gas jar of chlorine.
(ii) a piece of moist red litmus paper is placed in a gas jar of ammonia .
(iii)Silver nitrate solution is added to dilute hydrochloric acid.
(iv)Zinc oxide is heated.
(v) A glowing splint is introduced into a gas jar containing oxygen.
Q 1 (c) Write correctly balanced equations for the following reactions :
(i) Molten sodium and chlorine.
(ii) Nitrogen and oxygen when lightning strikes.
(iii) Iron and dilute sulphuric acid.
(iv) Decomposition of hypochlorous acid in sunlight.
(v) Action of heat on potassium nitrate.

Q 1(d) Water can be split into hydrogen and oxygen under suitable conditions.
The equation representing the change is :
2H2O(l) ---------------> 2H2(g) + O2(g).
(i) If a given experiment result in 2500 cm3 of hydrogen being produced, what value of oxygen is liberated at the same time under the same conditions of temperature and pressure?

(ii) The 2500 cm3 of hydrogen is subjected to 2 1/2 times increases in pressure (temperature remaining constant ). What volume will the hydrogen now occupy ?

(iii) Taking the volume of hydrogen calculated in (d) (ii), what change must be made in the kelvin (absolute) temprature to return the volume to 2500 cm3 (pressure remaining constant)?


Q 1 (e). The compound Na2B4O7.10H2O is commonly known as borax. When litmus is added to a solution of borax solution, it turns blue
(i) What can you say about the pH of borax solution?
(ii) Calculate the precentage of boron (B) in borax. (H = 1, B = 11, O = 16, Na = 23. Answer correct to 1 decimal place.)****************************************
Forum for asking for specific questions
http://www.icseguess.com/forum/forum_posts.asp?TID=154&PN=1

2007-03-05 02:41:20 · answer #1 · answered by LucySD 7 · 0 0

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2016-12-18 06:04:09 · answer #2 · answered by erke 4 · 0 0

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2007-03-05 02:35:39 · answer #3 · answered by NAINA 1 · 0 0

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2007-03-05 16:04:33 · answer #4 · answered by buddy 2 · 0 0

http://learning.indiatimes.com/test_papers/papers/solvedpapers.html

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2007-03-05 02:33:25 · answer #5 · answered by slv 3 · 0 0

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