1. Produces a high concentration Of
hydrogen ions in aqueous solution.
2. Produces a low concentration of hydroxyl ions in aqueous solution.
3. Produces almost only ions in solution.
4. Produces ions and molecules in solution.
5. Produces a basic gas on reacting with an ammonium salt.
6. Produces hydrogen on reacting With lead.
7. Produces hydrogen on reacting with
aluminium metal.
8. Reacts With an oxidising agent on heating liberating chlorine.
9. Precipitates a hydroxide on reacting with a salt solution of copper.
10. Gives a slight purple colour to a blue litmus solution
3. Give reasons for the following :
a] Dilute sulphuric acid and dilute formic acid produce different colours on a pH paper but almost similar colours on a litmus paper.
b] Sodium bisulphate solution has a pH less than 7 but sodium acetate solution
has a pH above 7.
cl A pH paper has more utility than a litmus paper.
d] A solution showing pH value 7 need not necessarily be water.
(a) Na2CO3 (b) CH3COOH
(c) CH3COONH4 (d) K2SO4
25. Which of the following acts as both Bronsted and Lewis acid?
(a) Cu+2 (b) SO2
(c) Fe+3 (d) NH4+
(A)
(B)
(C)
(D)
(a) will liberate ammonia from ammonium sulphate on heating?
(b) is a strong acid?
(c) contains molecules as well as ions?
a) Anhydrous
b)Effloresence
Q.1. Name the following:
(a) A basic solution which does not contain a metallic element.
(b) An alkali which on dissociation produces a high concentration of hydroxyl ions.
(c) A complex salt solution used for testing a basic gas lighter than air.
(d) A base which reacts with hydrochloric acid to give a salt which on hydrolysis gives a slightly acidic solution.
WHAT IS MEANT BY NON-LUMINOUS FLAME.. EXPLAIN THIS IN DETAIL..
(i)
3. Give a chemical test to distinguish between :
(a) dilute sulphuric acid and dilute hydrochloric acid,
(b) dilute sulphuric acid and conc. sulphuric acid.
Q. The pH values of certain substances are as below :
A=1.0; B=2.9; C=5; D=7; E=11; F=13. State which of the following:
hydrogen ions in aqueous solution.
2. Produces a low concentration of hydroxyl ions in aqueous solution.
3. Produces almost only ions in solution.
4. Produces ions and molecules in solution.
5. Produces a basic gas on reacting with an ammonium salt.
6. Produces hydrogen on reacting With lead.
7. Produces hydrogen on reacting with
aluminium metal.
8. Reacts With an oxidising agent on heating liberating chlorine.
9. Precipitates a hydroxide on reacting with a salt solution of copper.
10. Gives a slight purple colour to a blue litmus solution
3. Give reasons for the following :
a] Dilute sulphuric acid and dilute formic acid produce different colours on a pH paper but almost similar colours on a litmus paper.
b] Sodium bisulphate solution has a pH less than 7 but sodium acetate solution
has a pH above 7.
cl A pH paper has more utility than a litmus paper.
d] A solution showing pH value 7 need not necessarily be water.
67. If a few drops of a concentrated acid accidentally spills over the land of a student, what should be done?
(a) Wash the hand with saline solution.
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogencarbonate.
(c) After washing with plenty of water apply solution of sodium hydroxide on the hand
(d) Neutralise the acid with a strong alkali
64. Calculate the pH of a solution which contains 9.9 ml of 1 M HCI and 100 ml of 0.1 M NaOH.
65. Calculate the pH of a solution by mixing 0.1 litre of pH - 4 and 0.2 litre of pH = 10.
65. Calculate the pH of a solution obtained by mixing 10 ml of 0.1 M HCI and 40 ml of 0.2 M H2SO4-
(A) NO3- (B) CN- (C) NH3 (D) BF3
Explain with reasons:
(c) Carbon can reduce lead oxide but not aluminium oxide.
(d) Electrolytic reduction is done to obtain aluminium ?
(e) Why 'the food containing iron salts' should not be cooked in aluminium utensils ?
(f) A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.
Please do not provide any link.
Q.28. State what will be the effect of each of the following solutions on blue litmus -
i] soln. ii] KCl soln. iii] soln.
6. Explain with reasons:
(a) In the electrolytic reduction of alumina, the graphite anode is gradually consumed.
or
Why the anode has to be replaced from time to time in this process?
(b) Roasting is carried out on sulphide ores and not on carbonate ores.
(c) Carbon can reduce lead oxide but not aluminium oxide.
(d) Electrolytic reduction is done to obtain aluminium?
(e) Why 'the food containing iron salts' should not be cooked in aluminium utensils?
(f) A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.