Class 11th

9.46. While converting vegetable oil into vegetable ghee, H₂ is used as a

(a) Oxidising agent           

(b) Reducing agent             

(c) Both             

(d) None

9.46. While converting vegetable oil into vegetable ghee, H₂ is used as a

(a) oxidising agent           

(b) reducing agent             

(c) both             

(d) none

9.45. Choose the incorrect statement.

(a) H₂O₂has planar structure.

(b) Alkali oxides present in glass catalyse the decomposition of H₂O₂.

(c) Decomposition of H₂O₂ is a disproportionation reaction.

(d) H₂O₂ molecule simultaneously undergoes oxidation and reduction.

9.44. Choose the incorrect statement:

(a) H⁺ can exist freely.

(b) Hydrogen combines with other elements by losing, gaining, or sharing of electrons.

(c) Hydrogen forms electrovalent and covalent bonds with other elements.

(d) H⁺ isextremely small as compared to normal atomic and ionic sizes of 50 to 200 pm.

9.43. Choose the incorrect statement:

(a) Hard water is not suitable for laundry.

(b) Temporary hardness can be removed by boiling.

(c) Calgon is used for removing permanent hardness of water.

(d) Calgon forms precipitates with Ca²⁺ and Mg²⁺.

MCQs:

9.42. Hydrogen peroxide in the name of perhydrolis used as

(a) Antipyretic

(b) Antiseptic

(c) Analgesic

(d) All of the above

9.41. Assertion: Hard water is desirable for laundry.

Reason: Soap containing sodium stearate (C₁₇H₃₅COONa) reacts with hard water to precipitate out Ca/Mg stearate.

9.40. Assertion: An ice cube floats on water. 

Reason: Density of ice is more than that of water.

9.39. Assertion: Lithium hydride used in the synthesis of other useful hydrides.

Reason: Lithium hydride is very reactive at moderate temperatures with O₂ or Cl₂.

9.38. Assertion: H⁺ does not exist freely and is always associated with other atoms or molecules.

Reason: H⁺ form hydrides.