Which among the following is present inside the nucleus of an atom?

• Protons and Neutrons

• Electrons and Protons

• Neutrons and Electrons

• Neutrons, Protons, Electrons

2.

What is baking soda?

• Aluminium bicarbonate

• Sodium isolate

• Sodium bicarbonate

• Aluminium sulphate

Which among the following elements is a liquid at room temperature?

• Phosphorus

• Mercury

• Sodium

• Aluminium

Which among the following is an endothermic reaction?

• Respiration

• Combustion

• Sweating

• Burning of natural gas

Which among the following has maximum density?

• Water

• Ice

• Ethylene

• Arthropoda

What happen in an oxidation reaction?

• Protons are lost

• Electrons are lost

• Neutrons are lost

• Electrons are gained

Which of the process is known as nitrification?

• Reaction of nitrogen monoxide with oxygen to form nitric acid

• Reaction of nitrogen dioxide with water to form nitric acid

• Conversion of ammonia to nitrites

• Conversion of ammonia to nitrites

Catalytic converters are generally made from

• carbon

• alkaline metals

• transition metals

• transition metals

The soft silvery metallic element which ionizes easily when heated or exposed to light and is present in atomic clocks is

• Calcium

• Cesium

• Cerium

• Cerium

The total energy of an electron inside an atom is

• zero

• more than zero

• less than zero

• less than zero