Download Acids, Bases

INDIAN SCHOOL AL WADI AL KABIR
DEPARTMENT OF SCIENCE
CLASS X
W.S. No.2
CHEMISTRY
Topic: Acids, Bases and Salts
DATE: 04.05.15
Name:
Previous year questions from the topic chemical properties of acids and
bases
1. (a) A metal compound 'A' reacts with dilute hydrochloric acid to produce
effervescence. The gas evolved extinguishes a burning candle. If one of the compound
formed is Calcium chloride then identify 'A' and the gas evolved. Also write a
balanced chemical equation for the reaction which occurred.
b) Write the balanced chemical equation for the action of granulated zinc with sodium
hydroxide. Name the products formed.
2. (a) Write the chemical reaction of metal carbonates with acid. What happens on
passing this gas evolved above, over lime water? Write the chemical equation for it.
Previous year Questions from the topic characteristics of acids and bases
3. (i) Name the products formed when an acid reacts with metal carbonates.
(ii) Give one example of this kind of reaction and write its chemical equation.
(iii) How will you test the liberated gas?
(2013 SA 1 ISWK)
4. A drop of red litmus solution is added to the following solutions given below. State
the change in color of the red litmus observed in each.
(i) Soap solution (ii) Sodium hydroxide solution
Previous year questions from the topic pH
5. (a) You have two solutions X and Y. the pH of solutions X is 5 and pH
of solution Y is 8. Which solution has more hydrogen ion concentration?
Which of this is acidic and which one is basic?
(b) While diluting an acid, why is it recommended that the acid should
be added to water and not water to the acid?
6. (a) Name an antacid. How does its nature help to relieve from stomach indigestion
(b) A farmer treats the soil of his fields with quick lime or Calcium carbonate.
What information do you get about the nature of the soil, from his treatment?
State the purpose of the farmer, served by treating the soil with quick lime.
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Previous year questions from the topic Salts
7. Write the chemical name and formula of washing soda. How is it prepared?
Write balanced chemical equation of the reaction.
8.
Baking soda is used in small amount for making bread and cake. It helps to make
these soft and spongy. An aqueous solution of baking soda turns red litmus blue. It is
also used in soda – acid fire extinguisher.
Use this information to answer the following questions
(i) How does baking soda help to make cakes and bread soft and spongy?
(ii) How does it help in extinguishing fire?
(iii) Is the pH value of baking soda solution lesser than or greater than 7?
MCQ s from the practicals pH and Properties of acids and bases
1. A student was observing a pH chart. He observed that the two colours at the extreme ends of
the pH chart are:
(a)red and green (b) red and blue (c) green and blue (d) orange and green pH
2. When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is
produced. This solution should be –
(a)NaOH (b) Lemon juice (c) Water (d) HCl
3.
On adding a few drops of universal indicator to three unknown colourless solutions P, Q and R
taken separately in three test – tubes as shown in the following diagrams, a student observed the
changes in colour as green in (P), red in (Q) and violet in (R). The decreasing order of pH of the
solutions taken is:
(a) P > Q > R
(b) R >P > Q
(c) Q > P > R
(d) R > Q > P
Prepared by Ms. Jenesha J
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