Basic Chemistry

According to ______. In a chemical reaction, the sum of the masses of the reactants and products remains unchanged.

Answer explanation

Law of conservation of mass states that mass can neither be created nor destroyed.

A group of atoms carrying a fixed charge on them is called_______.

The maximum number of electrons accommodated in each orbital is

• 1

• 3

• 2

• 4

The strongest chemical bond is

• Covalent bond

• Ionic bond

• Hydrogen bond

• Metallic bond

The permanent hardness of water is due to the presence of

• Chlorides and sulphates of Ca & Mg

• Carbonates of Fe

• Bicarbonates of Ca & Mg

• Heavy metals

The electronic configuration of water is

• 1S²2S²2P²

• 1S¹2S²2P⁵

• 1S²2S²2P⁶

• 1S²2S²2P⁴

The functional group of carboxylic acid is

• -OH

• -COOH

• -CHO

• -COOR

Saturated hydrocarbons are

• double bonded carbon atoms

• triple bonded carbon atoms

• single bonded carbon atoms

• both (i) and (ii)

The general formula of alkene is

• C_nH_2n-2

• C_nH_2n

• C_nH_2n+2

• C_nH_n-2

The IUPAC nomenclature for CH₃-CO-CH₃ is

• propane

• propene

• propanone

• propanol