Question 2 :
Why does the milkman shifts the pH of the fresh milk from 6 to slightly alkaline when he adds a very small amount of baking soda to fresh milk?
Question 4 :
If copper sulphate crystals are moistened with water again after removing water of crystallisation, what will be their new colour?
Question 6 :
10 ml of a solution of NaOH is found to be completely neutralised by 8 ml of a given solution of HCl. If we take 20 ml of the same solution of NaOH, the amount of HCl solution is required to be neutralised. It will be
Question 7 :
A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains _____.
Question 9 :
10 ml of a solution of NaOH is found to be completely neutralised by 8 ml of a given solution of HCl. If we take 20 ml of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be ____.
Question 11 :
A solution turns red litmus blue, its pH is likely to be
Question 12 :
What is meant by the half a water molecule in the formula of plaster of paris?
Question 13 :
Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is weakly acidic?
Question 15 :
Name the sodium compound which is used for softening hard water.
Question 16 :
What is the colour of copper sulphate crystals when water of crystallisation is removed?
Question 17 :
Why does milk of pH 6 takes a long time to set as curd when a milkman adds a very small amount of baking soda to fresh milk?
Question 20 :
Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is weakly alkaline?
Question 21 :
What product will be released if a solution of sodium hydrogencarbonate is heated?
Question 22 :
Name the substances which on treatment with chlorine yields bleaching powder.
Question 23 :
Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain .
Question 25 :
Which one of the following types of medicine is used for treating indigestion?
Question 28 :
A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solutions contains
Question 29 :
Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is neutral?
