Explanation

Explanation

The smell change in meat is due to decomposition and bacterial action, which alters its chemical composition.

This indicates a chemical change, not just a physical one.

Explanation

Positive rays, also known as canal rays, are formed when electrons in a discharge tube collide with gas atoms, ionizing them and creating positively charged ions.

These ions then travel towards the cathode and are repelled by it, passing through holes in the cathode to form a stream of positive rays. Since these rays are composed of ions derived from the gas present in the tube,

Their nature is directly determined by the composition of the residual gas within the discharge tube. 

Explanation

Hydrogen is lighter than air, so a hydrogen-filled balloon experiences buoyant force that makes it rise.

This is due to Archimedes’ principle, where lighter gases are pushed upward by heavier surrounding air.

Explanation

Methane is the simplest of saturated hydrocarbons with a chemical formula CH4.

It consists of four hydrogen atoms and one carbon atom.

It is the simplest alkane.

Explanation

Aluminum is widely used in aircraft manufacturing due to its lightweight and high strength.

It also resists corrosion, making it ideal for aircraft structures.

Explanation

Maximum molar volume is at 127°C and 1 atm = 32.84 L

Explanation

Group IIA elements (alkaline earth metals) have 2 electrons in their outermost s-orbital.

Their general electronic configuration ends with ns², where n is the period number.

Explanation

Period Length in Periodic Table:

Period 6 has 32 elements (including lanthanides), making it the longest.

Period 7 is incomplete but will match Period 6 when fully discovered.

Explanation

The 6th period of the modern periodic table contains 32 elements.

This period is known as the "extended" period and includes elements from the Lanthanide series. 

It is the longest period of the periodic table