The chemicals and the reaction conditions required for the preparation of ethane are

• C₂H₅I, Zn-Cu, C₂H₅OH

• CH₃Cl, Na, H₂O

• KOOC-CH=CH-COOK, , electrolysis

• CH₃CO₂Na_, NaOH, CaO, Δ

Sodium is heated in air at 300°C to form X. X absorbs CO₂ and forms Na₂CO₃ and Y. Which of the following is Y ?

• H₂

• O₂

• H₂O₂

• O₃

Which one of the following reactions does not form gaseous product?

• PbO₂ + H₂O₂ →

• Acidified KMnO₄ + H₂O₂ →

• PbS + H₂O₂ →

• Cl₂ + H₂O₂ →

Which of the following is not an air pollutant?

• N₂

• N₂O

• NO

• CO

Which of the following compounds is soluble in benzene but almost insoluble in water?

• C₂H₅OH

• CH₃CO₂H

• CH₃CHO

• C₆H₅NO₂

Which of the following is a pair of functional isomers?

• CH₃COCH₃, CH₃CHO

• C₂H₅CO₂H, CH₃CO₂CH₃

• C₂H₅CO₂H, CHCO₂C₂H₅

• CH₃CO₂H, CH₃CHO

In which of the following reactions, MgO is not formed?

• Mg + CO₂ →

• Mg + dil. HNO₃ →

• Mg + NO $\stackrel{∆}{\to }$

• Mg + B₂O₃

The compound prepared by a substitution reaction of benzene is

• acetophenone

• glyoxal

• cyclohexane

• hexabromo cyclohexane

Which of the following is not correct ?

• SiO₂ is used as acid flux

• The distance between the layers in graphite is 3.35 × 10^-3 cm.

• SiO₂ reacts with Na₂CO₃ and liberates CO.

• The hybridisaton of C in graphite is sp².

20.

Which of the following is not correct ?

• Ammonia is used as refrigerant

• A mixture of Ca(CN)₂ and C is known as nitrolim.

• A mixture of Ca(H₂PO₄)₂ and CaSO₄ .2H₂O is known as superphosphate of lime.

• Hydrolysis of NCl₃ gives NH₃ and HOCl.