A liquid was mixed with ethanol and a drop of concentrated H₂SO₄ was added. A compound with a fruity smell was formed. The liquid was:

• CH₃OH

• HCHO

• CH₃COCH₃

• CH₃COCH₃

In which of the following arrangements, the sequence is not strictly according to the property written against it? 

• CO₂< SiO₂< SnO₂< PbO₂: increasing oxidising power

• HF< HCl < HBr < HI : increasing acid strength

• NH₃< PH₃< AsH₃< SbH₃: increasing basic strength

• NH₃< PH₃< AsH₃< SbH₃: increasing basic strength

Identify the incorrect statement among the following

• Ozone reacts with SO₂ to give SO₃

• Silicon reacts with NaOH(aq) in the presence of air to give Na₂SiO₃ and H₂O

• Cl₂ reacts with excess of NH₃ to give N₂ and HCl

• Cl₂ reacts with excess of NH₃ to give N₂ and HCl

24.

Which of the following statements is true?

• H₃PO₃ is a stronger acid than H₂SO₃

• In aqueous medium HF is a stronger acid than HCl

• HClO₄ is a weaker acid than HClO₃

• HClO₄ is a weaker acid than HClO₃

What products are expected from the disproportionation reaction of hypochlorous acid?

• HClO₃ and Cl₂O 

• HClO₂ and HClO₄

• HCl and Cl₂O

• HCl and Cl₂O

Which of the following oxides is amphoteric in character?

• CaO

• CO₂

• SiO₂

• SiO₂

The molecular shapes of SF₄, CF₄ and XeF₄ are

• the same with 2,0 and 1 lone pairs of electrons on the central atom, respectively

• the same with 1, 1 and 1 lone pair of electrons on the central atoms, respectively

• different with 0, 1 and 2 lone pair of electrons on the central atoms, respectively

• different with 0, 1 and 2 lone pair of electrons on the central atoms, respectively

The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is

• zero

• Two

• one

• one

The correct order of the thermal stability of hydrogen halides (H – X) is

• HI > HBr > HCl > HF

• HF > HCl > HBr > HI

• HCl < HF > HBr < HI

• HCl < HF > HBr < HI

Heating an aqueous solution of aluminium chloride to dryness will give

• AlC_l3

• Al₂Cl₆

• Al₂O₃

• Al₂O₃