Atoms and Molecules — Science STD 9 — Question

Which of the following obeys the law of constant proportions in their formation:

If two solution have the same osmolarity, they are said to be:

The atomic radius of hydrogen is in nanometers:

Beta particles are essentially:

Rough ER contains:

A sample of NH₃ molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:

The element which is not common between the compounds called baking soda and soda ash is:

1. Sodium.
2. Hydrogen.
3. Oxygen.
4. Carbon.

Rinderpest disease of poultry is caused by:

1. Insects
2. Bacteria
3. Virus
4. Protozoa

Starfish belongs to phylum:

1. Mollura.
2. Coelenterata.
3. Arthropoda.
4. Echinodermata.

Two objects of masses 1kg and 2kg are moving velocities 2m/s and 4m/s, respectively. They collide and after collision the first object moves at a velocity 3m/s, then velocity of second object is: