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Q1. | With increase in temperature, the surface tension of water |

A. | increases [Wrong Answer] |

B. | decreases [Correct Answer] |

C. | remains constant [Wrong Answer] |

D. | increases linearly [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Which of the following is an exothermic reaction ?

Conversion of graphite to diamond

Decomposition of water

Dehydrogenation of ethane to ethylene

none of these

⇒ A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be

0°C

0°K

-136.5°C

-136.5°K

⇒ The viscosity of water at room temperature may be around one

centipoise

poise

stoke

both (b) &(c)

⇒ The amount of Zn (atomic weight = 65) required to form 224 c.c. of H

_{2}at N.T.P. on treatment with dilute H

_{2}SO

_{4}will be __________ gm.

0.065

0.65

6.5

65

⇒ The heat capacity of a substance is

greater for liquid state than for solid state.

lower for liquid state than for gaseous state.

higher for solid state than for liquid state.

equal for solid and liquid states below melting point.

⇒ The temperature at which the second Virial co-efficient of a real gas is zero is called the

eutectic point

Boyle temperature

boiling point

critical temperature

⇒ Number of gm moles of solute dissolved in one litre of a solution is called its

equivalent weight

molarity

molality

normality

⇒ Number of gram equivalent of solute dissolved in one litre of solution is called its

normally

molarity

molality

formality

⇒ PH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be

0

10

7

14

⇒ 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.

⇒ Average molecular weight of air is about

21

29

23

79

⇒ Pick out the wrong statement.

One kg-mole of an ideal gas occupies 22.4 m

^{3}at N.T.P.

One lb-mole of an ideal gas occupies 359 ft

^{3}at N.T.P.

One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P.

Density of dry air at N.T.P. is 1 gm/litre.

⇒ PH value of an alkaline solution is

7

> 7

< 7

constant over a wide range

⇒ For an endothermic reaction, the minimum value of energy of activation will be (where, Δ

*H*= enthalpy of the reaction)

Δ

*H*

>Δ

*H*

<Δ

*H*

0

⇒

*C*/

_{p}*C*for monoatomic gases is

_{v}1.44

1.66

1.99

1

⇒ Ideal solution is formed, when its components have zero

heat of mixing.

volume change.

both (a) & (b).

neither (a) nor (b).

⇒ The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the

phase rule

experimental data

emperical equations

theoretical equations

⇒ An equation for calculating vapour pressure is given by, log

_{10}P = A - B(t + c). This is called the

Kistyakowsky equation

Antonic equation

Kopp's rule

Trouton's rule

⇒ Addition of a non-volatile solute to a solvent produces a __________ in its solvent.

freezing point elevation

boiling point depression

vapor pressure lowering

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

⇒ Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2 ? Molecular weight of gas 'X' is to be assumed to be 2.

2

4

8

16

⇒ Heat of reaction is a function of the

pressure

temperature

both(a)&(b)

neither (a) nor (b)

⇒ 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. The temperature at which the above mixture will exert a pressure of one standard atm. is

less than 100°C

100°C

between 100 and 110°C

110.6°C

⇒ 1 kg/cm

^{2}is equal to

760 torr

1KPa

10 metres of water column

1 metre of water column

⇒ __________ equation relates latent heat and boiling point.

Antonie

Kistyakowsky

Kopp's

Trouton's

⇒ If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will

be reduced to l/4th.

increase four times.

increase two times.

none of these.

⇒ The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg. ?

0.2

0.1

0.4

0.6

⇒ The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the

nature of both the gas & the liquid.

temperature.

total pressure.

none of these.

⇒ One 'Therm' is equivalent to

10

^{5}BTU

10

^{5}kcal

10

^{9}BTU

10

^{9}kcal

⇒ 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

⇒ Total energy at a point comprises of __________ energy.

potential & kinetic

pressure

internal

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