Noble gas molecules are held together by
- A. van der Waals forces
- B. hydrogen bonds
- C. dative bonds
- D. covalent bonds
Which of the following elements is diatomic?
- A. Sodium
- B. Oxygen
- C. Iron
- D. Neon
The bonds in crystalline ammonium chloride are
- A. covalent and dative
- B. ionic and covalent
- C. ionic, covalent and dative
- D. ionic, covalent and hydrogen bond
In metallic solid, the forces of attraction is between the mobile valence electrons and the
- A. atoms
- B. neutrons
- C. negative ions
- D. positively charged nuclei
Which of the following bond types is responsible for the high boiling point of water?
- A. Metallic bond
- B. Covalent bond
- C. lonic bond
- D. Hydrogen bond
In which of the following series are the atoms arranged in order of increasing ionization energy?
- A. Li, Na K
- B. B, Be, Li
- C. O, F, Ne
- D. Be, mG, Ca
In the periodic table, alkaline earth metals can be found in group
- A. l
- B. ll
- C. VI
- D. VII
Rare gases are stable because they
- A. are chemically active
- B. contain equal number of protons and neutrons
- C. contain more electrons than protons
- D. have octet structures
Which of the following halogens is liquid at room temperature?
- A. lodine
- B. Chlorine
- C. Bromine
- D. Fluorine
In the periodic table all elements within the same group have the same
- A. number of neutrons
- B. number of valence electrons
- C. number of isotopes
- D. atomic number
The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to
- A. s-block period 3, group 1
- B. p-block, period 3, group 2
- C. s-block, period 3, group 3
- D. p-block, period 3, group 3
Which of the following arrangements represents the correct order of electronic energy level?
- A. 1s 2p 2s 3p 3s 3d 4s
- B. 1s 2s 2p 3s 3p 3d 4s
- C. 1s 2s 2p 3s 3p 4s 3d
- D. 1s 2s 3s 2p 3p 4s 3d
Which of the following statements is correct?
- A. Atomic size decreases down the group
- B. Atomic size increases across the period
- C. Anions are smaller than the parent atom
- D. Cations are smaller than the parent atom
An atom of an element X gains two electrons. The symbol of the ion formed is
- A. X +
- B. X 2+
- C. X 2-
- D. X -
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
- A. M2Y3
- B. M3Y2
- C. MY
- D. M3Y
The molecule which has a linear shape is
- A. CH4
- B. NH3
- C. H2S
- D. CO2
Which of the following instruments is used in detecting the presence of radiation?
- A. Cathode ray tube
- B. Geiger-Muller counter
- C. Mass spectrometer
- D. X-ray tube
Aluminium is extracted electrolysis from
- A. bauxite
- B. cryolite
- C. duralumin
- D. kaolin
Which of the following processes does not involve the use of limestone?
- A. Extraction of iron in the blast furnance
- B. Manufacture of tetraoxosulphate (VI) acid by Contact process
- C. Production of washing soda by Solvay process
- D. Production of cement
The following substances are ores of metals except
- A. bauxite
- B. cuprite
- C. cassiterite
- D. graphite
The reagent that can be used to distinguish ethene from ethyne is
- A. ammoniacal silver trioxonitrate (V) solution
- B. Benedict solution
- C. bromine water
- D. Fehling's solution