Similarity of crystalline form, indicating similar or analogous chemical composition is called _____.

1. 1. Mercapatan
   2. Isomerism
   3. Allotropy

Which of the following statements is not correct about oxidation?

1. 1. Process involving addition of Oxygen
   2. Process involving removal of Oxygen
   3. Process involving removal of Hydrogen
   4. Process involving removal of electropositive radical atom

Chemical union of two or more molecules of the same compound to form larger molecules is called _____.

1. 1. Polymerization
   2. Oxidation
   3. Chemical change
   4. Sublimation

A substance which changes readily into vapour without heating is called _____.

1. 1. Volatile
   2. Synthetic
   3. Effervescent
   4. Efflorescent

Bodies which usually fall from the sky on the Earth are called _____.

1. 1. Rock
   2. Comets
   3. Meteors
   4. None of these

The natural satellite of the Earth is _____.

1. 1. Neptune
   2. Moon
   3. Mars
   4. Venus

Which of the following planets orbits around the sun in the backward direction form east to west?

1. 1. Earth
   2. Venus
   3. Mercury
   4. Jupiter

Which is the brightest star in the Night sky?

1. 1. Sirius
   2. Sun
   3. Deneb
   4. Altair

Which of the following planets has the smallest diameter?

1. 1. Saturn
   2. Neptune
   3. Pluto
   4. Mercury

On which planet are scientists hopeful of the existence of some type of life?

1. 1. Saturn
   2. Mars
   3. Jupiter
   4. Pluto