Advertisements
Advertisements
प्रश्न
Define an acid and a base. Give two examples of each.
उत्तर
Acids: Substances that ionise on dissolving in water producing hydrogen ions (H+ions) are called acids. Acids are sour in taste and they turn blue litmus to red.
Examples: Hydrochloric acid, HCl, and sulphuric acid, H2SO4.
Bases: Substances that ionise on dissolving in water producing hydroxide ions (OH- ions) are called bases. Bases are bitter in taste, slippery to touch and they turn red litmus to blue.
Examples: Magnesium hydroxide, Mg(OH)2, and sodium hydroxide, NaOH.
APPEARS IN
संबंधित प्रश्न
When phenolphthalein is added to NaOH, the colour of the solution will become _________.
- colourless
- red
- pink
- yellow
From which plant is litmus paper or litmus solution obtained?
- Moss
- Rose
- Hibiscus
- Lichen
Complete and balance the following chemical equations:
NaOH (aq) HCI (aq)→
Fill in the blank in the following sentences:
Substances do not show their acidic properties without.......................... .
Name the product formed when Cl2 and H2 produced during the electrolysis of brine are made to combine.
Name a metal compound which has detergent properties (cleansing properties).
Answer the following question:
What is the universal indicator? Does Mg (OH)2 react with sodium hydroxide? If not, why?
Which of the following statements is true for acids?
Solutions of acids conduct ______.
A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.
- Write the chemical name and formula of 'X'.
- Write chemical equations for the chemical reactions involved in the above statements.
