5) Molal elevation constant

243. If the solvent boils at a temperature T₁ and the solution at a temperature T₂ , then the elevation of boiling point is given by:

1) T₁ + T₂

2) T₂ - T₁

3) T₁ - T₂

4) T₂ / T₁

5) None of the above

244. When sugar is added to water, what is the change observed in boiling and freezing points of water?

1) Both boiling point and freezing point decreases

2) Both boiling point and freezing point increases

3) Boiling point increases and freezing point decreases

4) Boiling point decreases and freezing point increases

5) All of these

245. Find the molarity of 0.585g NaCl present in 500 ml of solution

1) 0.00002M

2) 0.01 M

3) 0.1 M

4) 0.2 M

5) 0.02 M

246. What is the freezing point depression of 0.05 molal solution of a non-electrolyte in water?

1) + 3.72°C

2) 0.093°C

3) - 0.093°C

4) -93°C

5) - 186°C

247. Unit of molarity is:

1) Kg / litre

2) Mol / litre

3) mol / kg

4) g / litre

5) g / mililitre

248. Which one of the following will exhibit highest osmotic pressure at 25°C?

1) Acetic acid

2) Urea

3) Glucose

4) Calcium chloride

5) KCl

249. What is the equivalent weight of KMnO₄ when it is converted in MnSO₄?

1) M/1

2) M/2

3) M/3

4) M/5

5) M/6

250. What is the equivalent weight of KMnO₄ when it is converted in MnO₂?

1) M/1

2) M/2

3) M/3

4) M/4

5) M/5

251. What is the equivalent weight of KMnO₄ when it is converted in К₂MnO₄?

1) M/1

2) M/2

3) M/3

4) M/4

5) M/5

252. In the complex [Fe(H₂O)₅ (NO⁺)]SO₄. The oxidation state of iron is:

1) 0

2) +1

3) +2

4) +3

5) +6

253. Which of the following statement is correct?

1) Copper reacts with dil. HNO₃ to produce NO₂

2) Copper reacts with very dil. HNO₃ to produce NH₄NO₃

3) Copper reacts with dil. HNO₃ to produce N₂

4) Copper reacts with conc. HNO₃ to produce of mixture of NO and NO₂

5) Copper reacts with conc. HNO₃ to produce NO₂

254. Formation of …………. takes place when Zn dissolves in an excess of NaOH.

1) ZnO

2) Zn(OH)₂

3) H₂ZnO₂

4) Na Zn (OH)₃

5) Na₂ZnO₂

255. What is the nature of electrolyte as Al(OH)₃?

1) Amphoteric

2) Basic

3) Acidic

4) Neutral

5) None of these

256. In which among the following are the noble metals soluble?

1) Aqua regia

2) NaOH

3) NH₄OH

4) H₂SO₄

5) Water gas

257. Galvanization of iron sheets is done by:

1) Zn plating

2) Pb plating

3) Cu plating

4) Tin plating

5) Ag plating

258. Which metal is common between brass, bronze and German silver?

1) Mg

2) Zn

3) Al

4) Cu

5) Ag

259. Coinage metals show the properties of:

1) Active elements

2) Inert elements

3) Typical elements

4) Normal elements

5) Transitional elements

260. A device in which electric current is produced at the expense of spontaneous chemical reaction:

1) electrolytic cell

2) galvanic cell

3) voltameter

4) both galvanic cell and voltaic cell

5) voltaic cell

261. Among the following which is not a true statement for Faraday’s laws of electrolysis?

1) The weight of substance deposited is not directly proportional to the quantity of electricity passed

2) The weight of substance deposited is directly proportional to the quantity of electricity passed

3) The volume of gases reduced or oxidized is directly proportional to the quantity of electricity passed

4) The weight of substance deposited at the respective electrodes are directly proportional to their equivalent weights

5) The weight of substance deposited is directly proportional to the quantity of electricity passed

262. The quantity of electricity required to liberate or deposit 1 gram equivalent of a substance from its solution during electrolysis is known as:

1) Coulomb

2) Ampere