The negatively charged particle in an atom is the

A. Electron

B. Neutron

C. Positron

D. Proton

How many orbits are contained in an atom with atomic number 13?

A. 7

B. 6

C. 5

D. 3

The Van der waals' forces are dominant intermolecular forces in_______?

A. Ammonium chloride

B. Chlorine

C. Sodium chloride

D. Water

The compound formed between ₁₄X and ₁₆Y is _______?

A. XY

B. XY₂

C. X₂Y

D. X₄Y₆

The shape of a molecule of water is _______?

A. Non-linear

B. Octahedral

C. Pyramidal

D. Tetrahedral

A metallic ion Z²⁺ with an inert gas structure contains 18 electrons. How many protons are contained in this ion?

A. 20

B. 18

C. 16

D. 2

Which of the following pairs of elements forms amphoteric oxides?

A. Be and Mg

B. Na and K

C. B and Al

D. Si and Pb

Which of the following pairs of compounds belongs to the same homologous series?

A. C₃H₈ and C₃H₆

B. C₄H₁₀ and C₅H₁₀

C. C₂H₄ and C₄H₁₀

D. C₂H₆ and C₄H₁₀

The following transition metal ions would be coloured in aqueous solution except________?

A. Cr³⁺

B. Fe³⁺

C. Mn³⁺

D. Sc³⁺

The gas given off when ethanol reacts with sodium is

A. Carbon(IV)oxide

B. Hydrogen

C. Methane

D. Oxygen