1. Stretching of spring is an example of  chemicalenergymoistureoriginaloxygenphysicalproductsrust change.

2. In physical reactions  chemicalenergymoistureoriginaloxygenphysicalproductsrust are identical to the reactants.

3. Burning of paper is a type of  chemicalenergymoistureoriginaloxygenphysicalproductsrust change.

4. Charring of sugar on heating is a  chemicalenergymoistureoriginaloxygenphysicalproductsrust change.

5. Chemical change always result in  chemicalenergymoistureoriginaloxygenphysicalproductsrust conversions.

6. A gas may be formed in  chemicalenergymoistureoriginaloxygenphysicalproductsrust change.

7. A film of brownish substance on iron which forms in the presence of moisture and air is called  chemicalenergymoistureoriginaloxygenphysicalproductsrust.

8. Photosynthesis is a  chemicalenergymoistureoriginaloxygenphysicalproductsrust change.

9. The curd cannot be reversed into milk.

10. A change is said to be chemical if we cannot get back the substance in  chemicalenergymoistureoriginaloxygenphysicalproductsrust state.

11. Painting prevents the surface of iron gate from coming in contact with  chemicalenergymoistureoriginaloxygenphysicalproductsrust and  chemicalenergymoistureoriginaloxygenphysicalproductsrust thus prevents it from rusting.