b. fragile
c. rich in microorganisms
d. a fast developing soil
Answer:
B
Explanation:
Fragile & Edge 2020
b. The concentration of Cl⁻ ion will be 0.1M.
c. The concentration of undissociated H₂O molecules remains unchanged.
d. The pH of the beaker's contents will be neutral.
e. The pH of the beaker's contents falls.
Answer: Option (e) is the correct answer.
Explanation:
Since, the beaker contains NaOH solution whose pH is 13. As pH of NaOH is greater than 7 so, it means that this solution is basic in nature.
Whereas pH of HCl solution is equal to 1. As its pH is less that 7 so, it is acidic in nature.
Hence, when we add 10 ml of HCl into 100 mL of NaOH then there will be a slight decrease in pH of the solution because an acid is being added into the NaOH solution.
Thus, we can conclude that the statement pH of the beaker's contents falls, correctly describes the results of this mixing.
B-eccentricity of orbit
C- period of rotation
D-period of revolution
Answer: The molar mass of the element is 40 g/mol and element is Calcium.
Explanation:
At STP:
1 mole of a gas contains 22.4 L of volume
Molar mass is defined as the mass of 1 mole of a substance.
To calculate mass of of the substance, we use the equation:
Volume of gas = 22.4 L
Density of gas = 1.7824 g/L
Putting values in above equation, we get:
The element having molar mass 40 g is Calcium.
Hence, the molar mass of the element is 40 g/mol and element is Calcium.
Carbon disulfide has a vapor pressure of 363 torr at 25 °C and a normal boiling point of 46.3 °C.
Vapor pressure or equilibrium vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system. It is an indication of the thermodynamic tendency of a liquid to evaporate.
It is the pressure at which a liquid and its vapor are in equilibrium at a given temperature where the vapor is said to "push" against the atmosphere, so the higher the vapor pressure the faster the liquid evaporates.
The vapor pressure is different for different compounds like for Carbon disulfide the vapor pressure is 363 torr at 25 °C.
Thus, Carbon disulfide has a vapor pressure of 363 torr at 25 °C and a normal boiling point of 46.3 °C.
Learn more about Vapor Pressure, here:
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Mass of Neon : = 24.21564 g
Given
1.2 moles of Neon
Required
mass of Neon
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
Mol = mass : Molar mass
so mass of Neon(MM=20,1797 g/mol) :
= mol x MM
= 1.2 x 20,1797
= 24.21564 g