Name the chemicals used in making fire extinguisher.
A milkman adds a very small amount of baking soda to fresh milk.
Calcium phosphate is present in tooth enamel. Its nature is
You have been provided with three test tubes.
Incorrect statement about acids is/are
Give two important uses of washing soda and baking soda.
A student dipped pH paper in rain water. What would be the colour of the pH paper?
In one of the industrial processes used for manufacture of sodium hydroxide, a gas x is formed as by-product.
Fresh milk has a pH of 6. How do you think
Assertion : While dissolving an acid or base in water
Reason : Dissolving an acid on a base in water
The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the solution will be:
A dry pellet of a common bases B when kept in open absorbs moisture and turns sticky.
(i) Define a universal indicator
(ii) Solution A gives pink colour
(iii) Name one salt whose solution has pH
A substance X is used as a building material and insoluble in water.
Equal volumes of hydrochloric acid and sodium hydroxide solution of some concentration are mixed and the pH of the resulting solut..
Plaster of paris should be stored in moisture proof containers. Explain why.
Answer the following:
(i) What happens when a concentrated solution
(ii) Why is the electrolysis of a concentrated solution
Assertion : Phenolphthalalein gives pink colour in basic solution
Reason : Phenolphthalalein is a natural indicator
A solution has pH of 7. Explain how would you
The pH of a solution is 4.0. What should be the change in the hydrogen ion concentration of the solution, if its pH is to be incre..
name an acid which is present in baking powder.
A few drops of liquid X were added to distilled water
(i) Name one natural source of each of the following acids.
(ii) Which ion is commonly produced by all acids?
What is water of crystallisation? Write the common name and chemical formula of a commercially important compound which has ten w..
(i) A chemical compound x is used in
(ii) How many molecules of water of
(iii) How will you prepare the above compound
Metal compound A reacts with dilute hydrochloric acid to produce effervescence
Assertion : Sodium hydroxide reacts
Reason : Acids reacts with active metals
How is the concentration of hydroxide ions (OH-) affected
Give one example in each case:
(i) Write three physical properties each of acids and bases. (ii) How will you show with an example
Name the substance which on treatment with chlorine yields bleaching powder
Match the chemical substances given in column (I)
With their appropriate application given in column (II).
Which gas is usually liberated when an acid reacts with a metal?
Write an equation to show the reaction between plaster of paris and water
What is tooth enamel chemically?
Tooth enamel is one of the hardest substances in our body.
What is the common name of the compound CaOCL2?
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube.
How is the concentration of hydronium ions
The pH of a salt used to make tasty and crispy pakoras is 14.
A student prepared solutions of (i) an acid and (ii) a base in two separate beakers.
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