Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | Two solutions A_{1} and A_{2} have pH value of 2 and 6 respectively. It implies that the solution |

A. | A_{2} is more alkaline than solution A_{2} [Wrong Answer] |

B. | A_{1} is highly acidic. [Wrong Answer] |

C. | A_{1} is very slightly acidic. [Wrong Answer] |

D. | both (a) &(c). [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ 1 kg of calcium carbide (CaC

_{2}) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?

5

10

15

20

⇒ Which of the following is not a unit of pressure?

Parsec

Kilo-pascal

Bar

Newton/metre

^{2}

⇒ One micron is equal to __________ cm.

10

^{-2}

10

^{-4}

10

^{-6}

10

^{-8}

⇒ The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

normal condensation.

wetting.

sum of (a) and (b).

difference of (a) and (b).

⇒ The unit of specific heat at constant pressure,

*C*, in SI unit is

_{p}W/m

^{2}°C

J/kg°K

W/m°K

J/m

^{3}°K

⇒ Pick out the wrong statement:

The integral heat of solution of either components can not be calculated from heat of mixing data.

The average value of heat of neutralisation of dilute solutions of weak acids and bases is much less compared to that for strong acids and bases.

The standard heat of solution of the hydrate of a substance is the difference between the heat of solution of the anhydrous substance and its heat of hydration.

The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the nature & amount of the solute & the solvent, on the temperature & on the initial & final concentrations of the solution.

⇒ Kopp's rule is useful for the determination of

molal heat capacities of gases.

heat capacities of solids.

activation energy.

heat capacities of gases.

⇒ Number of gm moles of solute dissolved in 1 kg of solvent is called its

normality

molarity

molality

formality

⇒ S.T.P. corresponds to

1 atm. absolute pressure & 15.5°C.

760 mm Hg gauge pressure & 15.5°C.

760 torr & 0°C.

101.325 kPa gauge pressure & 15.5°C.

⇒ Saturated molal absolute humidity of the vapor-gas mixture depends upon the

vapor pressure at dry bulb temperature

total pressure

both (a) and (b)

neither (a) nor (b)

⇒ The vapour pressure of water is given by, in

*P*=

_{sat}*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

0.07

0.09

0.11

0.13

⇒ A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.

saturated

superheated

unsaturated

dry gaseous

⇒ "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

Law of Petit and Dulong

Kopp's rule

Nearnst heat theorem

Trouton's rule

⇒ According to the kinetic theory, the thermal conductivity of a monoatomic gas is proportional to

T

T

^{0.5}

T

^{1.5}

T

^{2}

⇒ Roult's law is obeyed by a __________ solution.

saturated

molar

normal

none of these

⇒ Hess's law of constant heat summation is based on conservation of mass. It deals with

equilibrium constant.

reaction rate.

changes in heat of reaction.

none of these.

⇒ For estimation of heat capacity of a solid compound, one can use

Clayperon's equation

Gibb's equation

Kopp's rule

Trouton's rule

⇒ Heat capacity of air can be approximately expressed as,

*C*= 26.693 + 7.365 x10

_{p}^{-3}

*T*, where,

*C*is in J/mole.

_{p}*K*and

*T*is in

*K*. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

10.73 kJ

16.15 kJ

18.11 kJ

18.33 kJ

⇒ For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

inversely

exponentially

linearly

negligibly

⇒ Internal energy is independent of the __________ for an ideal gas.

pressure

volume

both (a) & (b)

neither (a) nor (b)

⇒ Pick out the correct statement.

A substance existing above its critical temperature is called a saturated vapor.

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.

Heat added to or given up by a substance at constant temperature is called the sensible heat.

The end points of a vapor-pressure vs. temperature curve are critical and triple points.

⇒ The hydroxyl ion (OH

^{-}) concentration in a solution having pH value 3 will be

10

^{-11}

10

^{-10}

10

^{-3}

10

^{-4}

⇒ The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water

*X*in the vapour phase satisfies

^{w}0 <

*X*< 0.5

_{w}*X*= 0.5

_{w}0.5 <

*X*< 1.0

_{w}*X*= 1.0

_{w}⇒ Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.

lower than

higher than

equal to

either (a) or (b); depends on the liquids

⇒ The latent heat of vaporisation

decreases with increased temperature.

decreases as pressure increases

becomes zero at the critical point.

all (a), (b) & (c).

⇒ A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

atomic weight of the metal is 4.

equivalent weight of the metal is 4.

atomic weight of the metal is 2.

equivalent weight of the metal is 8.

⇒ Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

1.72

0.58

0.5

0.2

⇒ Pick out the wrong unit conversion of heat transfer rate.

1 kcal/hr= 1.163 Watt.

1 Watt = 1.163 kcal/hr.

1 BTU/ft

^{2}.hr = 2.712 kcal/m

^{2}.hr.

1 kcal/m

^{2}.hr = 0.3687 BTU/ft

^{2}.hr = 1.163 Watt/m

^{2}.

⇒ A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

N

_{2}O

_{4}

N

_{2}O

_{5}

N

_{2}O

_{3}

none of these

⇒ Pick out the wrong unit conversion of mass transfer co-efficient.

1 lb/hr.ft

^{3}.atm. = 4.8182 kg/hr.m

^{2}.bar

1 kg/hr.m

^{2}.atm= 0.98687 kg/hr. m .bar

1 lb/hr . ft

^{2}= 4.8823 kg/hr . m

^{2}

1 kg/hr . m

^{2}= 4.8823 lb/hr . ft

^{2}