Freezing point and boiling point of water changes, with the change in ____.
Boiling and freezing point of water are changes with change in: 1. Pressure 2. Temperature 3. Added impurities
The particles in a suspension ____.
The particles of solute settle down at the bottom in a suspension. This is called sedimentation.
Who confirmed formulae of water is H2O?
Sir Davy Confirmed formula of water is H2O.
Which of the following solutions exhibit Tyndall effect?
Tyndall effect is shown by colloids. Starch solution is a colloid.
Which of the following is an incorrect statement about water?
Water is a poor conductor of electricity. To enable the conductivity of water dil. sulphuric acid is added.
In an unsaturated solution more solute can be dissolved without increasing the amount of the solvent.
An unsaturated solution is a solution in which some more solute can be dissolved in the given solvent at a given temperature.
Milk is an example of a ____.
Milk is a colloid of liquid fat dispersed in water.
Which characteristic among the following is not the property of a true solution?
A true solution is never translucent. Colloids are translucent.
Sulphur is soluble in ____.
Carbon disulphide is an inorganic solvent and sulphur is soluble in it.
Heterogeneous mixture can be separated by ____.
A heterogeneous mixture contains physically distinct parts and has non-uniform composition. Hence, hand picking, sieving and filtration methods can be used to separate the heterogeneous mixtures.
Tincture of iodine is a ____.
Tincture of iodine is a solution of iodine in ethyl alcohol.
A homogeneous mixture of two or more substances is a ____.
A homogeneous mixture of two or more substances is a solution. In a solution, solute cannot be seen even with a microscope as it is completely dissolved in the solvent and the solution is uniform.
Hydrogen and oxygen combine in ____ ratio by volume and ____ ratio by weight to fom water.
Hydrogen and oxygen combine in 2:1 ratio by volume an 1:8 ratio by weight to fom water.
In aerosol, dispersed phase is gas and dispersion medium is solid.
Aerosol is a colloid in which dispersion medium is air and dispersed phase is solid or liquid.
When potassium treated with water ____ and ____ bare formed.
2 K + 2 H2O →2 KOH + H2
Sedimentation does not take place in a mixture of ____ and water.
Sedimentation does not take place in a mixture of albumin and water. Albumin in water forms a colloid. Sedimentation does not take place in colloids.
To enable water to conduct electricity ____ is added during electrolysis of water.
Ethanol, urea and glucose are poor conductors of electricity. Dil. sulphuric acid or common salt is added to enable water to conduct electricity.
____ prepared water in the laboratory for first time by combining , Two parts of hydrogen and one part of oxygen.
In 1781, Henry Cavendish became the first to confirm from his studies that water is not an element, But a compound made up of Hydrogen and Oxygen. He Prepared water for first time in the laboratory nby combining 2 parts of hydrogen and 1 part of oxygen.
Suspension is a ____ solution.
In a suspension, the particles can be seen through the naked eye. Hence, it is heterogeneous.
Water is a ____.
Water is Polar covalent compound with dielectric constant 80 at 293K.
Which among the following is a mixture of two elements?
Sulphur powder and iron filings are elements. Sugar, common salt and water are compounds. Milk is a colloid and air is a mixture.
A student is asked to mix sugar in water and stir well. The student observed that ____.
Sugar in water forms a transparent solution. This is a true solution.
The process of decomposing water into its constituent elements is called ____.
The process of decomposing water into its constituent elements is called Electrolysis of water. 2 H2O →2H2 + O2
When Non-metal oxide is dissolved in water, The resulting solution will be ____.
When Oxide of Non-metal is dissolved in water, the resulting solution will be Acidic.
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