21. Is baking soda chemically different from baking powder?
22. Which of the following materials has the highest electrical conductivity?
23. The action of heating ores in the presence of oxygen is called . . . . . . . .
24. Consider the following statements.
1. Gold is the most ductile metal.
2. The best conductors of heat are silver and copper.
3. Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife.
Which of the statements given above are correct?
1. Gold is the most ductile metal.
2. The best conductors of heat are silver and copper.
3. Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife.
Which of the statements given above are correct?
25. Whose alloy is nichrome?
26. What is the molecular formula of ferrous chloride?
27. Which of the following is used as an ingredient of antacid?
28. The chemical symbol of which of the following elements is derived from Latin?
29. What is the Common name of mercury?
30. . . . . . . . . is the most important ore of aluminium.
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