Advertisements
Advertisements
प्रश्न
Match the following physical quantities with units
| Physical quantity | Unit |
| (i) Molarity | (a) g mL–1 |
| (ii) Mole fraction | (b) mol |
| (iii) Mole | (c) Pascal |
| (iv) Molality | (d) Unitless |
| (v) Pressure | (e) mol L–1 |
| (vi) Luminous intensity | (f) Candela |
| (vii) Density | (g) mol kg–1 |
| (viii) Mass | (h) Nm–1 |
| (i) kg |
Advertisements
उत्तर
| Physical quantity | Unit |
| (i) Molarity | (e) mol L–1 |
| (ii) Mole fraction | (d) Unitless |
| (iii) Mole | (b) mol |
| (iv) Molality | (g) mol kg–1 |
| (v) Pressure | (c) Pascal |
| (vi) Luminous intensity | (f) Candela |
| (vii) Density | (a) g mL–1 |
| (viii) Mass | (i) kg |
Explanation:
(i) It is defined as the number of moles of solute dissolved in 1 litre of solution. So, the unit of molarity is mol L–1
(ii) Mole fraction is defined as the number of moles of a constituent divided by the total number of moles. So, it is unitless.
(iii) Mole is the unit to measure the amount of an atom or molecule in \[\ce{SI}\] system. it is symbolized as "mol".
(iv) It is defined as the number of moles of solute dissolved in 1 kg of solvent. so, the unit of morality is mol kg–1.
(v) It is defined as the force per unit area. so, the unit of pressure is Pascal.
(vi) It is the amount of visible light released per unit solid angle in unit time. so, it's unit will ve candela.
(vii) It is defined as the mass of a substance (in kg) divided by the volume of that substance (in mL). The unit of density is g mL–1.
(viii) Mass is used to measure the amount of a substance or an object. The unit of mass is kg.
APPEARS IN
संबंधित प्रश्न
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Explain the term Saturated solution giving examples.
Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.
A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).
- Express this in percent by mass.
- Determine the molality of chloroform in the water sample.
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Explain the term molality
Why does the molarity of a solution depend upon temperature?
Solve the following problem:
Write the following number in ordinary decimal form:
3.75 × 10−1
Solve the following problem:
Write the following number in ordinary decimal form:
43.71 × 10−4
Solve the following problem:
Perform the following calculation. Round off your answer to two digits.
`(1.4xx10^9)/((2.77xx10^3)(3.76xx10^5))`
Perform the following calculation. Round off your answer to three digits.
(8.39 107) (4.53 109)
Solve the following problem:
Perform the following calculation. Round off your answer to three digits.
`(8.94xx10^6)/(4.35xx10^4)`
Solve the following problem:
Perform the following calculation. Round off your answer to three digits.
`((9.28xx10^9)(9.9xx10^-7))/((511)(2.98xx10^-6))`
A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?
When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ______ of light by milk and the phenomenon is called ______. This indicates that milk is a ______ solution.
If the concentration of glucose \[\ce{(C6H12O6)}\] in blood is 0.9 g L–1, what will be the molarity of glucose in blood?
Which of the following solutions have the same concentration?
(i) \[\ce{20 g of NaOH in 200 mL of solution}\]
(ii) \[\ce{0.5 mol of KCl in 200 mL of solution}\]
(iii) \[\ce{40 g of NaOH in 100 mL of solution}\]
(iv) \[\ce{20 g of KOH in 200 mL of solution}\]
The molarity of pure water is ______.
