Calcination

Q. Rusting of iron can be identified by change in its:​

1. shape
2. volume
3. colour
4. state

Q. How many reactions can show slag formation process from the given reactions ?
(i)$Si{O}_2+CaO\to CaSi{O}_3$
(ii)$FeO+Si{O}_2\to FeSi{O}_3$
(iii)$CaO+P_2{O}_5\to C{a}_3(P{O}_4{)}_2$
(iv)$C{r}_2{O}_3+2Al\to A{l}_2{O}_3+2Cr$
(v)$MgC{O}_3+Si{O}_2\to MgSi{O}_3+C{O}_2$

Q.

Which one of the following processes makes the ore porous?

1. Distillation

2. Calcination

3. Smelting

4. Froth floatation

Q. Cement is a mixture of oxides and silicate compounds of many metals like calcium, aluminium etc. True or False?
[TEXTBOOK B.4]

1. True
2. False

Q. Rusting of iron can be identified by change in its:​

1. shape
2. state
3. volume
4. colour