Science
The table below has information regarding pH and the nature (acidic/basic) of four different solutions. Which one of the options in the table is correct ?
| Option | Solution | Colour of pH paper | Approximate pH value | Nature of solution |
|---|---|---|---|---|
| (a) | Lemon juice | Orange | 3 | Basic |
| (b) | Milk of magnesia | Blue | 10 | Basic |
| (c) | Gastric juice | Red | 6 | Acidic |
| (d) | Pure water | Yellow | 7 | Neutral |
Related Questions
Select washing soda from the following :
- NaHCO3
- Na2CO3.5H2O
- Na2CO3.10H2O
- NaOH
The emission of brown fumes in the given experimental set-up is due to
- thermal decomposition of lead nitrate which produces brown fumes of nitrogen dioxide.
- thermal decomposition of lead nitrate which produces brown fumes of lead oxide.
- oxidation of lead nitrate forming lead oxide and nitrogen dioxide.
- oxidation of lead nitrate forming lead oxide and oxygen.
A metal 'X' is used in thermite process. When X is burnt in air it gives an amphoteric oxide 'Y'. 'X' and 'Y' are respectively :
- Fe and Fe2O3
- Al and Al2O3
- Fe and Fe3O4
- Al and Al3O4
MnO2 + xHCl ⟶ MnCl2 + yH2O + zCl2
In order to balance the above chemical equation, the values of x, y and z respectively are
- 6, 2, 2
- 4, 1, 2
- 4, 2, 1
- 2, 2, 1