Question

I. Identify the odd one out :

Myopia , presbyopia , hypermetropia, spectrometer


II. Complete the following correlation :

Focal length : metre : : power of a lens : …………….


III. State whether the following statement is true or false :

The chemical reactions in which heat is liberated are called endothermic reaction.


IV. Write the chemical formula for rust.


V. Identify the type of chemical reaction:

ZnSO4 + BaS → BaSO4 + ZnS
​

Answer 1

Answer:

1st. spectometer

spectometer2nd. dioptre

dioptre3rd. false answer is exothermic chemical reaction

false answer is exothermic chemical reaction4th. 4fe + 3O2 = 2fe2O3

5th. double displacement reaction