21.

For a first order reaction, (A) → products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is

• 1.73 x 10^–5 M/ min

• 3.47 x 10^–4 M/min

• 3.47 x 10^–5 M/min

• 3.47 x 10^–5 M/min

Iron exhibits + 2 and +3 oxidation states. Which of the following statements about iron is incorrect?

• Ferrous oxide is more basic in nature than the ferric oxide.

• Ferrous compounds are relatively more ionic than the corresponding ferric compounds.

• Ferrous compounds are less volatile than the corresponding ferric compounds.

• Ferrous compounds are less volatile than the corresponding ferric compounds.

K_f for water is 1.86K kg mol–1.If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol (C₂H₆O₂) must you add to get the freezing point of the solution lowered to –2.8°C?

• 72 g

• 93 g

• 39 g

• 39 g

Which of the following compounds can be detected by Molisch’s test?

• Nitro compounds

• Sugars

• Amines

• Amines

Aspirin is known as

• acetyl salicylic acid

• phenyl salicylate

• acetyl salicylate

• acetyl salicylate

Ortho–Nitrophenol is less soluble in water than p– and m– Nitrophenols because

• o–Nitrophenol is more volatile in steam than those of m – and p–isomers

• o–Nitrophenol shows Intramolecular H–bonding

• o–Nitrophenol shows Intermolecular H–bonding

• o–Nitrophenol shows Intermolecular H–bonding

What is DDT among the following

• Greenhouse gas 

• A fertilizer

• Biodegradable pollutant

• Biodegradable pollutant

2–Hexyne gives trans–2–Hexene on treatment with

• Pt/H₂

• Li/NH₃

• Pd/BaSO₄

• Pd/BaSO₄

Iodoform can be prepared from all except

• ethyl methyl ketone

• isopropyl alcohol

• 3-methyl-2-butanone

• 3-methyl-2-butanone

In the given transformation, which of the following is the most appropriate reagent?

• NH₂NH₂,O^-H

• Zn − Hg/HCl

• Na,Liq.NH₃

• Na,Liq.NH₃