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Solve the following problem: Write the following number in ordinary decimal form: 14.3 × 10−2

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प्रश्न

Solve the following problem:

Write the following number in ordinary decimal form:

14.3 × 10−2

एका वाक्यात उत्तर
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उत्तर

14.3 × 10−2 = 0.143

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पाठ 2: Introduction to Analytical Chemistry - Exercises [पृष्ठ २५]

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बालभारती Chemistry [English] Standard 11 Maharashtra State Board
पाठ 2 Introduction to Analytical Chemistry
Exercises | Q 4. (O)(f) | पृष्ठ २५

संबंधित प्रश्‍न

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.


What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2 L?


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).

  1. Express this in percent by mass.
  2. Determine the molality of chloroform in the water sample.

Explain the term molality


Why does the molarity of a solution depend upon temperature?


Solve the following problem:

Find out the molar mass of the following compounds:

Copper sulphate crystal (CuSO4.5H2O)

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)


Solve the following problem:

Find out the molar mass of the following compounds:

Mohr’s salt [FeSO4(NH4)2SO4.6H2O]

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)


Solve the following problem:

Write the following number in ordinary decimal form:

5.16 × 104


Solve the following problem:

Write the following number in ordinary decimal form:

43.71 × 10−4


Solve the following problem:

Write the following number in ordinary decimal form:

0.011 × 10−3


Solve the following problem:

Perform the following calculation. Round off your answer to two digits.

`(1.4xx10^9)/((2.77xx10^3)(3.76xx10^5))`


Solve the following problem:

Perform the following calculation. Round off your answer to two digits.

`((4xx10^-3)(9.9xx10^-7))/((789)(1.002xx10^-10)(0.3xx10^2))`


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:

What weight of calcium oxide will be formed on heating 19.3 g of calcium carbonate?
(At. wt.: Ca = 40; C = 12; O = 16)


Solve the following problem:

The hourly energy requirements of an astronaut can be satisfied by the energy released when 34 grams of sucrose are “burnt” in his body. How many grams of oxygen would be needed to be carried in space capsule to meet his requirement for one day?


Name the process associated with the following

A drop of ink placed on the surface of water contained in a glass spreads throughout the water.


What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?


Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture

Two immiscible liquids.


Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Name a lustrous non-metal.


A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.

(i) What would you expect to see, if the ink contains three different coloured components?

(ii) Name the technique used by the child.

(iii) Suggest one more application of this technique.


What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?


If the concentration of glucose \[\ce{(C6H12O6)}\] in blood is 0.9 g L–1, what will be the molarity of glucose in blood?


Sulphuric acid reacts with sodium hydroxide as follows:

\[\ce{H2SO4 + 2NaOH -> Na2SO4 + 2H2O}\]

When 1 L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is:

(i) 0.1 mol L–1

(ii) 7.10 g

(iii) 0.025 mol L–1

(iv) 3.55 g


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) \[\ce{20 g of KOH in 200 mL of solution}\]


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

The molarity of pure water is ______.


An aqueous KCl solution of density 1.20 g mL-1 has a molality of 3.30 mol kg-1. The molarity of the solution in mol L-1 is ______. (Nearest integer)


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