881.

Which of the following is the correct method of preparation of methyl fluoride?

• CH₄ + HF →

• CH₃OH + HF →

• CH₄ + F₂ →

• CH₃Br + AgF →

Which of the following species can function both as oxidising as well as reducing agent?

• Cl^-

• ${\mathrm{ClO}}_4^{-}$

• ClO^-

• ${\mathrm{MnO}}_4^{-}$

Which of the following is used as an oxidiser in rocket propellants?

• Ammonium perchlorate

• Alcohol

• Acrylic rubber

• Polyurethane

Concentrated sulphuric acid can be reduced by

• NaCl

• NaF

• NaBr

• NaOH

The element evolving two different gases on reaction with conc sulphuric acid is

• P

• C

• Hg

• S

Which one of the following reactions will occur on heating AgNO₃ above its melting point?

• 2AgNO₃ → 2Ag + 2NO₂ + O₂

• 2AgNO₃ → 2Ag + N₂ + 3O₂

• 2AgNO₃ → 2AgNO₂ + O₂

• 2AgNO₃ → 2Ag + 2NO + 2O₂

In alkaline medium ClO₂, oxidises H₂O₂ to O₂ and itself gets reduced to Cl. How many moles of H₂O₂ are oxidized by 1 mole of ClO₂?

• 1.0

• 1.5

• 2.5

• 3.5

The electron affinity values for the halogens show the following trend :

• F < Cl > Br >I

• F < Cl< Br< I

• F > Cl > Br > I 

• F < Cl > Br < I

When H₂S gas is passed through nitric acid, the product is:

• prismatic S (colloidal)

• amorphous S

• monoclinic S

• plastic S

Atoms in a P₄ molecule of white phosphorus are arranged regularly in space in which of the following way ?

• At the comers of tetrahedron

• At the comers of a cube

• At the comers of a four membered ring

• At the centre and comers of a equivalent triangle