Stoichiometry

231. pH value of a solution containing 1 gm of hydrogen ion per litre will be

1. 0
2. 1
3. 7
4. 10

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232. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be

1. 0
2. 10
3. 7
4. 14

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233. pH value of an alkaline solution is

1. 7
2. > 7
3. < 7
4. Constant over a wide range

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234. pH value of H₂SO₄ (5% concentration) is

1. 5
2. 7
3. > 7
4. < 7

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235. Pick out the correct conversion.

1. 1 BTU =453.6 calories
2. 1 BTU = 252 calories
3. 1 calorie = 252 BTU
4. 1 calorie = 453.6 BTU

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236. Pick out the correct statement.

1. A substance existing above its critical temperature is called a saturated vapor
2. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature
3. Heat added to or given up by a substance at constant temperature is called the sensible heat
4. The end points of a vapor-pressure vs. temperature curve are critical and triple points

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237. Pick out the wrong conversion formula for the conversion of weight units:

1. 1 tonne = 1000 kg = 22.046 lbs
2. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
3. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
4. None of these

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238. Pick out the wrong statement about the recycle stream in a process.

1. Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants
2. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio
3. Recycling in a process does not help in getting higher extent of reaction
4. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column

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239. Pick out the wrong statement.

1. Refractories used in muffle furnace should have low thermal conductivity
2. The electrical resistivity of refractories drops rapidly with rise in temperature
3. For reducing spalling tendency, the refractory should be well fired and its porosity should be more
4. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

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240. Pick out the wrong statement:

1. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve
2. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite
3. Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture
4. Clapeyron equation is given by dP/dT = (λ/T) (V_G - V_L); where, P = vapor pressure, T = absolute temperature, λ = latent heat of vaporisation, V_G and V_L = volumes of gas and liquid respectively

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