Name the sodium compound which is used for softening hard water.
Why do HCL, HNO3, etc., show acidic characters in aqueous solutions
You have two solutions a and B. the pH of solution A is 6
Name the substance which on treatment with chlorine yields bleaching powder
You have been provided with three test tubes.
Write an equation to show the reaction between plaster of paris and water
Fresh milk has a pH of 6. How do you think
Incorrect statement about acids is/are
Under what soil condition do you think a farmer would treat the soil of his fields with quicklime
What is the common name of the compound CaOCL2?
Plaster of paris should be stored in moisture proof containers. Explain why.
What will happen if a solution of sodium hydrogen carbonate is heated?
Metal compound A reacts with dilute hydrochloric acid to produce effervescence
Why does an aqueous solution of an acid conduct electricity?
Why does dry HCL gas not change the colour of dry litmus paper?
A Solution turns red litmus blue
Why does distilled water not conduct electricity
Why do not acids show acidic behaviour in the absence of water?
A milkman adds a very small amount of baking soda to fresh milk.
Assertion : While dissolving an acid or base in water
Reason : Dissolving an acid on a base in water
A dry pellet of a common bases B when kept in open absorbs moisture and turns sticky.
Which one of the following types of medicines is
Write word equations and then balanced equations for
Equal lengths of magnesium ribbons are taken in test tubes A and B
If a few drops of a concerntrated acid accidentally spills over the hand of a student, what should be done?
Assertion : Phenolphthalalein gives pink colour in basic solution
Reason : Phenolphthalalein is a natural indicator
You are having five solutions A,B,C,D and E with pH values as follows:
While diluting an acid, why is it recommended that
How is the concentration of hydronium ions
A solution reacts with crushed egg-shells to give a
During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calciu..
A solution has pH of 7. Explain how would you
The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the solution will be:
Why should curd and sour substances not be kept in brass and copper vessels?
How is the concentration of hydroxide ions (OH-) affected
10mL of a solution of NaOH is found to be completely neutralised by
Five solutions A, B, C, D and E when tested with universal indicator
Calcium phosphate is present in tooth enamel. Its nature is
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
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