10th grade

Atomic No. of Carbon,No. of Electron,No. of Proton,No of electron is

• 12

• 7

• 6

• 4

Benzen Formula is

• C₆H₁₂

• C₆H₈

• C₈H₆

• C₆H₆

General formula of Alkane is

• C_nH_2n+4

• C_nH_2n+2

• C_nH_2n

• C_nH_2n-2

Hetero-atom in C₆H₁₂0₆

• Carbon

• Hydrogen

• Oxide

• Oxygen

One Bond( - ) means

• 1 electron

• 3 electron

• 2 electron

• 1 x 2 e + 1e

Cation is formed when

• Atom gains electrons

• Atom loses electrons

• Proton is lost by the atom

• Atom shares electrons

The property of self-linkage among identical atoms to form long chain compounds is known

• Superposition

• Catenation

• Isomerisation

• Halogenation

When CO₂ is passed through lime water, it turns milky. the milkiness in due to formation of

• H₂ O

• CaCO₃

• CaO

• CO₂

1. Which of the following acid is present in sour milk?

• Lactic acid

• tartaric acid

• glycolic acid

• citrus acid

Incorrect statement about acids is/are

• they have bitter taste

• they changes the colour or red litmus to blue

• they changes the colour or blue litmus to red

• all above