A compound contains 40.0% C, 6.7% H 53.3% O. If the molecular mass of the compound is 180, its molecular formula is [C =12, H =1,O]

• A) CH2O
• B) C3H6O3
• C) C6H6O3
• D) C6H12O6

Aluminum hydroxide is used in the dyeing industry as a?

• A. Dye
• B. Dispersant
• C. Salt
• D. Mordant

Which of the following is an example of a double salt?

• A) NH₄Cl
• B) alum
• C) NaCO₃
• D) AlCl₃

Which of the following solids has a network structure?

• A. Diamond
• B. lodine
• C. Sulphur
• D. Graphite

The main product of electrophilic addition of HCl to 2-methylpropene is

• A) 2-chloro-2- methylbutane
• B) 2-chloro-2-methylbutene
• C) 2- methyl-2-chloropropene
• D) 2-chloro-2- methylpropane

Metals can be extracted from their ores by a process involving

• A. reduction
• B. oxidation
• C. hydrolysis
• D. decomposition

Which of the following statements is true for strong electrolytes?

• A. They do not conduct electricity in the molten state
• B. They completely dissociate into ions in solution
• C. They are non-polar substances
• D. They partially dissociate into ions in solution

0.16g of methane when burnt increases the temperature of 100g of water by 40\(^{\circ}\), what is the heat of combustion of methane if the heat capacity of water is 4.2 Jg-10C-1? (CH\(_4\)=16).

• A)
  1,160kJmol\(^{-1}\)
• B)
  1,180kJmol\(^{-1}\)
• C)
  1,560kJmol\(^{-1}\)
• D)
  1,680kJmol\(^{-1}\)

The following non-metal form acidic oxides with oxygen except?

• A. phosphorus
• B. sulphur
• C. carbon
• D. chlorine

Which of the following physical properties decreases down a group in the periodic table?

• A. Atomic radius
• B. Ionic radius
• C. Electropositivity
• D. Electronegativity