Ncert Solutions Chemistry Class 11th

IUPAC name of element with atomic number 119 is ununennium.

The oxidation state of K in KO? is (+1).

H? O? can act as both an oxidizing & reducing agent in both acidic & basic medium. In the hydrogen economy, energy is stored & transmitted in the form of dihydrogen.

Bismuth (Bi) is a metal in group 15. Its hydride is BiH? , which is the strongest reducing agent due to its the lowest thermal stability.

Hydrated halides of group 2 from Ca onwards undergo dehydration on heating. But the hydrated halide of Mg, i.e., MgCl? ·8H? O, does not undergo dehydration on heating but undergoes hydrolysis.
BeO is amphoteric, while other oxides of group 2 are basic in nature.

Oxidation States (O.S) of Phosphorus (P):

• Hypophosphorous acid – H? PO? : +1
• Orthophosphoric acid – H? PO? : +5
• Hypophosphoric acid – H? P? O? : +4
• Orthophosphorous acid – H? PO? : +3

Formation of photochemical smog, which is also known as oxidizing smog, takes place in the presence of sunlight and O?

(a) Haber's process is used for the synthesis of NH?
(b) Ostwald's process is used to synthesize HNO?
(c) Contact process is used for the synthesis of H? SO?
(d) Hall-Héroult process is used for the extraction of aluminium.

The reaction is Fe (s) + 2HCl (aq) → FeCl? (aq) + H? (g). 50 g of Fe corresponds to 0.89 moles, which produces 0.89 moles of H? (g). The work done by the gas is calculated using W = -Δn_gasRT. The work done by the gas is the positive value, 2218 J.
Answer: 2218 J

This problem involves the stoichiometry of acid-base neutralization.

o   For the reaction with H? PO? (a dibasic acid), 100 mL of NaOH is required.

o   For the reaction with H? PO? (a monobasic acid), 200 mL of NaOH is required.