Assertion : The pH of sodium chloride solution is seven
Reason : Salt of strong acid and a strong base are acidic in nature
Name the sodium compound which is used for softening hard water.
The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?
Name the chemicals used in making fire extinguisher.
You have two solutions a and B. the pH of solution A is 6
You are having five solutions A,B,C,D and E with pH values as follows:
Assertion : If the pH inside the mouth decreases below
Reason : The bacteria present in mouth degrades the sugar
A student dipped pH paper in rain water. What would be the colour of the pH paper?
A milkman adds a very small amount of baking soda to fresh milk.
Incorrect statement about acids is/are
Calcium phosphate is present in tooth enamel. Its nature is
You have been provided with three test tubes.
Give two important uses of washing soda and baking soda.
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
A dry pellet of a common bases B when kept in open absorbs moisture and turns sticky.
The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the solution will be:
A substance X is used as a building material and insoluble in water.
(i) Define a universal indicator
(ii) Solution A gives pink colour
(iii) Name one salt whose solution has pH
Assertion : While dissolving an acid or base in water
Reason : Dissolving an acid on a base in water
Equal volumes of hydrochloric acid and sodium hydroxide solution of some concentration are mixed and the pH of the resulting solut..
name an acid which is present in baking powder.
Answer the following:
(i) What happens when a concentrated solution
(ii) Why is the electrolysis of a concentrated solution
Plaster of paris should be stored in moisture proof containers. Explain why.
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..
A few drops of liquid X were added to distilled water
What is water of crystallisation? Write the common name and chemical formula of a commercially important compound which has ten w..
(i) Name one natural source of each of the following acids.
(ii) Which ion is commonly produced by all acids?
(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
Write an equation to show the reaction between plaster of paris and water
(i) Write three physical properties each of acids and bases. (ii) How will you show with an example
Which gas is usually liberated when an acid reacts with a metal?
Name the substance which on treatment with chlorine yields bleaching powder
Give one example in each case:
How is the concentration of hydroxide ions (OH-) affected
What is tooth enamel chemically?
Tooth enamel is one of the hardest substances in our body.
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