The shape of a graphite crystal is
- A. Tetrahedral
- B. Pyramidal
- C. Octahedral
- D. Hexagonal
To which group and period respectively does an element with 15 electrons belong?
- A. 3 and 3
- B. 3 and 5
- C. 5 and 3
- D. 5 and 5
The bond formed when ammonia reacts with hydrogen ion to form ammonium ion is
- A. Covalent
- B. Dative
- C. Hydrogen bond
- D. Ionic
The number of unpaired electrons in an atom of an element 8Q is _______?
- A. 2
- B. 4
- C. 6
- D. 8
The alkaline earth metals have similar chemical properties because________?
- A. They are in the same period
- B. Their salts are colourless
- C. They have the same number of valence electrons
- D. They are very reactive
Which of the following halogens is solid at room temperature?
- A. Bromine
- B. Chlorine
- C. Flourine
- D. Iodine
The gas given off when ethanol reacts with sodium is
- A. Carbon(IV)oxide
- B. Hydrogen
- C. Methane
- D. Oxygen
The following transition metal ions would be coloured in aqueous solution except________?
- A. Cr3+
- B. Fe3+
- C. Mn3+
- D. Sc3+
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
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
A metallic ion Z\(^{2+}\) with an inert gas structure contains 18 electrons. How many protons are contained in this ion?
- A. 20
- B. 18
- C. 16
- D. 2
The shape of a molecule of water is _______?
- A. Non-linear
- B. Octahedral
- C. Pyramidal
- D. Tetrahedral
The compound formed between 14X and 16Y is _______?
- A. XY
- B. XY2
- C. X2Y
- D. X4Y6
The Van der waals’ forces are dominant intermolecular forces in_______?
- A. Ammonium chloride
- B. Chlorine
- C. Sodium chloride
- D. Water
How many orbits are contained in an atom with atomic number 13?
- A. 7
- B. 6
- C. 5
- D. 3
The negatively charged particle in an atom is the
- A. Electron
- B. Neutron
- C. Positron
- D. Proton