Question is ⇒ The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________, Options are ⇒ (A) 1026, (B) 1023, (C) 1020, (D) 1019 , (E) , Leave your comments or Download question paper.

Question is ⇒ The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________, Options are ⇒ (A) 1026, (B) 1023, (C) 1020, (D) 1019 , (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________
A.	10²⁶ [Wrong Answer]
B.	10²³ [Wrong Answer]
C.	10²⁰ [Correct Answer]
D.	10¹⁹ [Wrong Answer]
View Answer 1 -2 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Atoms of the same element, but of different masses are called
isobars
isotones
isotopes
none of these

⇒ 1 BTU/lb.^←°F is equivalent to __________ kcal/kg.°C.
1
2.42
1.987
4.97

⇒ Disappearance of snow in subzero weather exemplifies the process of
evaporation
sublimation
vaporisation
melting

⇒ The average translational kinetic energy with which a gas molecule is endowed is dependent on its
nature
size
absolute temperature
all (a), (b) & (c)

⇒ The vapor pressure of liquids (having similar chemical nature) at any specified temperature __________ with increasing molecular weight.
increases
decreases
remains unchanged
increases linearly

⇒ Which of the following gravity scales is used exclusively for liquids heavier than water ?
Baumme scale
Twaddel scale
API scale
none of these

⇒ Internal energy of a substance comprises of the __________ energy.
vibrational
rotational
translational
all (a), (b) & (c)

⇒ Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
compressibility
molecular weight
humidity
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

⇒ Solutions which distil without change in composition are called
ideal
saturated
supersaturated
azeotropic

⇒ 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
180
60.3
720
200

⇒ One micron is equal to __________ cm.
10^-2
10^-4
10^-6
10^-8

⇒ The most convenient way of expressing solution concentration is in terms of
mole fraction
normality
molality
molarity

⇒ On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes
1
8
4
2

⇒ 1 torr is equal to __________ mm Hg column.
1
0.1
10
1000

⇒ Addition of a non-volatile solute to a pure solvent
increases its freezing point.
increases its boiling point.
decreases its freezing point.
both (b) and (c)

⇒ Heat of __________ of a fuel is called its calorific value.
formation
combustion
reaction
vaporisation

⇒ In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?
30 c.c acid and 30 c.c base.
20 c.c acid and 25 c.c base.
15 c.c acid and 35 c.c base.
35 c.c acid and 15 c.c base.

⇒ The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the
relative humidity.
relative saturation.
percentage saturation.
none of these.

⇒ According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
No component is concentrated at the surface of the solution.
The component molecules are non polar and are of almost equal size.
In the formation of solution, chemical combination/molecular association between unlike molecules takes place.
The attractive forces between like and unlike molecules are almost equal.

⇒ Total energy at a point comprises of __________ energy.
potential & kinetic
pressure
internal
all (a), (b) & (c).

⇒ Pick out the wrong unit conversion of calorific value.
1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg.
1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³.
1 BTU/lb = 2.3 kcal/kg.
1 kcal/m³ = 0.1124 BTU/ft³.

⇒ The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of
formation
solution
combustion
fusion

⇒ In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
independent of the temperature.
increased with the increase in pressure.
decreased with the increase in pressure.
unchanged by the pressure change.

⇒ The evaporation of aqueous solution of sugar causes its molarity to
decrease. (b) increase.
remain unchanged.
either (a) or (b); depends on the concentration of the solution.

⇒ In the reaction, Ca + 2H₂O = Ca(OH)₂ + H₂ ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (atomic weight of calcium = 40)
4480
2240
1120
0.4

⇒ The osmotic pressure of a solution increases, if its __________ is decreased.
volume
solute concentration
temperature
none of these

⇒ Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).
°API = 200(G - 1)
°API = (141.5/G) - 131.5
°API = (140/G) - 130
°API = 145 - (145/G)

⇒ Which of the following ideal gas laws are not applicable to mixture of gases ?
Amgat's law
Dalton's law
Boyle's law & Charle's Law
none of these

⇒ A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.
283
566
293
141.5