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प्रश्न
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?
- strongly alkaline?
- strongly acidic?
- weakly acidic?
- weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
उत्तर
- Neutral → Solution D with pH 7.
- Strongly alkaline → Solution C with pH 11.
- Strongly acidic → Solution B with pH 1.
- Weakly acidic → Solution A with pH 4.
- Weakly alkaline → Solution E with pH 9.
The pH can be arranged in the increasing order of the concentration of hydrogen ions as pH = 11 < pH = 9 < pH = 7 < pH = 4 < pH = 1.
संबंधित प्रश्न
Fresh milk from cows has a pH of 6. So how does the pH change when this milk is turned to curd? Explain your answer.
A milkman adds a very small amount of baking soda to fresh milk. Why does he shift the pH of the fresh milk from 6 to slightly alkaline?
Fill in the blank in the following sentences:
Acids have a ..........................taste and they turn..........................litmus to..........................
The property which is common between vinegar and curd is that they:
(a) have sweet taste
(b) have bitter taste
(c) are tasteless
(d) have sour taste
A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
Fill in the following blank with suitable words:
Acids have a pH...........than 7.
Fill in the following blank with suitable words:
Alkalis have a pH.............. than 7.
Name two common antacids.
A solution turns blue litmus red. Its pH is likely to be:
(a) 7
(b) 5
(c) 8
(d) 14
The daffodil plants grow best in a soil having a pH range of 6.0 to 6.5. If the soil in a garden has a pH of 4.5, which substance needs to be added to the soil in order to grow daffodils?
(a) salt
(b) lime
(c) sand
(d) compost
Which of the following elements would from oxides which would indicate pH values less than seven, using moist pH paper?
Magnesium, Carbon, Sulphur, Hydrogen, Copper
What damage could be caused while the pH is low?
The salt whose aqueous solution will turn blue litmus to red is:
(a) ammonium sulphate
(b) sodium acetate
(c) sodium chloride
(d) potassium carbonate
Which of the following is not a natural indicator?
Methyl orange gives ______ colour in an acidic solution.
Write a note on:
Litmus
Using the knowledge of acids and bases, write a secret message with the help of baking soda and beet root. Explain how it works.
(Hint: Prepare baking soda solution in water. Use this solution to write the message on a sheet of white paper with a cotton bud. Rub a slice of fresh beetroot over the message.)
