Name the chemicals used in making fire extinguisher.
Calcium phosphate is present in tooth enamel. Its nature is
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?
You have been provided with three test tubes.
The pH of a sample of vegetable soup was found to be 6.5. How is this soup likely to taste?
Fresh milk has a pH of 6. How do you think
The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the solution will be:
In one of the industrial processes used for manufacture of sodium hydroxide, a gas x is formed as by-product.
(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.
A dry pellet of a common bases B when kept in open absorbs moisture and turns sticky.
Equal volumes of hydrochloric acid and sodium hydroxide solution of some concentration are mixed and the pH of the resulting solut..
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
Assertion : While dissolving an acid or base in water
Reason : Dissolving an acid on a base in water
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.
(i) A chemical compound x is used in
(ii) How many molecules of water of
(iii) How will you prepare the above compound
(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..
Which gas is usually liberated when an acid reacts with a metal?
Metal compound A reacts with dilute hydrochloric acid to produce effervescence
Name the substance which on treatment with chlorine yields bleaching powder
How is the concentration of hydroxide ions (OH-) affected
Write an equation to show the reaction between plaster of paris and water
Match the chemical substances given in column (I)
With their appropriate application given in column (II).
What is the common name of the compound CaOCL2?
Assertion : Sodium hydroxide reacts
Reason : Acids reacts with active metals
What is tooth enamel chemically?
Tooth enamel is one of the hardest substances in our body.
(i) Write three physical properties each of acids and bases. (ii) How will you show with an example
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube.
Give one example in each case:
How is the concentration of hydronium ions
While diluting an acid, why is it recommended that
What will happen if a solution of sodium hydrogen carbonate is heated?
Why does an aqueous solution of an acid conduct electricity?
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