Question 3 :
Gastric juice has a pH of about 1.2, what can you say about its nature ?
Question 5 :
What chemical changes are observed when an acid or base reacts with water?
Question 6 :
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 9 :
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 12 :
What happens when granulated zinc metal reacts with sodium hydroxide solution?
Question 14 :
Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain .
Question 17 :
Which of the following is a correct representation of hydroxide ions?
Question 19 :
Which one of the following types of medicines is used for treating indigestion?
Question 23 :
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 24 :
Which gas causes the bread or cake to rise when baking soda is added as an ingredient?
Question 28 :
Complete the following reaction: Metal carbonate/Metal hydrogen carbonate + ______ $\rightarrow$ Salt + ______ +water.
Question 29 :
A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solution contains
Question 30 :
What is formed when electricty is passed through aqueous solution of sodium chloride?
Question 31 :
What is the colour of the $CaCO_3$ precipitate formed when carbon dioxide is passed through lime water?
Question 32 :
What happens to the stain of curry on a white cloth when soap(basic in nature) is scrubbed on it ?
Question 35 :
How do indicators tell us about the acidic or basic property of a substance?
Question 36 :
What is the range in which a compound is said to be acidic?
Question 43 :
What will a reaction between hydrochloric acid and Sodium Hydroxide ( NaOH) result?
Question 46 :
What is the range of pH in which our body works?
Question 47 :
What can be caused with too much acid in our stomach?
Question 48 :
What happens to the copper oxide solution when dilute HCl dissolves in it?
Question 49 :
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 strongly alkaline?
Question 50 :
A solution turns red litmus blue, its pH is likely to be