A. Atomic number
B. Mass number
C. Atomic weight
D. Metallic characteristics
Correct Answer: Atomic number ✔
Last Updated: July 28, 2023
Related MCQs
- “The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements.” This is the statement of__________?
- A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be__________?
- The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases?
- Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is__________?
- At a temperature of 0°K, the molecules of a gas have only __________ energy?
- On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is __________ gm?
- Atmospheric pressure corresponds to a hydrostatic head of__________?
- The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be__________?
- Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?
- Clausius Clapeyron equation applies to the __________ process?
- 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is__________?
- The viscosity of water at room temperature may be around one __________?
- __________ chart is a graph related to Antoine equation ?
- The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be__________?
- The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times?
- If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature ?
- Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the__________?
- Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of__________?
- The heat of solution depends upon the__________?
- pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be__________?
- In a chemical process, the recycle stream is purged for__________?
- Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?
- If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be__________?
- The heat capacity of a substance is __________?
- The total number of atoms in 8.5 gm of NH3 is __________ × 1023?
- As per Kirchhoff s equation, the heat of reaction is affected by the__________?
- A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container__________?
- “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the __________ law?
- __________ equation gives the effect of temperature on heat of reaction ?
- Addition of a non-volatile solute to a pure solvent __________?
- If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its__________?
- Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is__________?
- 1 torr is equal to __________ mm Hg column?
- The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________?
- Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules __________?
- Which of the following is not a colligative property ?
- Total energy at a point comprises of __________ energy?
- The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is__________?
- A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be __________ kgf/cm2 ?
- Hess’s law of constant heat summation is based on conservation of mass. It deals with __________?
- In a neutral solution __________?
- Number of gm moles of solute dissolved in one liter of a solution is called its__________?
- A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is__________?
- Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?
- The value of gas constant ‘R’ is __________ kcal/kg.mole.°C?
- In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure?
- Unit of mass velocity is__________?
- The most convenient way of expressing solution concentration is in terms of__________?
- Disappearance of snow in subzero weather exemplifies the process of__________?
- The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________?
- In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________?