Question
Which of the following is an example of heterogeneous
catalysis?Solution
In the Haber process (N₂  + 3H₂  →2NH₃ ), iron (Fe) is used as a solid catalyst, while reactants are in the gas phase, making it heterogeneous catalysis.
- Simplify:

1280 ÷ 8 + 490 ÷ √49 + ? = 150 * 2
1780 – 60 ÷ 4 x 80 = ?
- Find the simplified value of the given expression.

72% of 486 – 64% of 261 = ?
5760 ÷ 45 × 15 = ?
What will come in the place of question mark (?) in the given expression?
40% of 150 - ?% of 75 = 15 × 1.6
81% of 2300 – 34% of 550 = ?
The value of 97 × 103 is _________.
9/5 × 18/25 ÷ 42/21 = ? - 82/75