Some liquids have the property of mixing in all proportions, forming a homogeneous solution. This property is known as …………….
A) miscibility
B) solubility
C) immiscibility
D) none of these
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Forming tiny droplets and clouds by water vapour is called …………
B) condensation
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Name some glassware that are used to measure the volume of liquids and solutions.
Graduated cylinder Burette Pipette
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State and explain the law of definite proportions.
Law of definite proportions : i. The law states that “A given compound always contains exactly the same proportion of elements by weight”. ii. French chemist, Joseph Proust worked with two samples...
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Diffusion occurs in this medium. A) Solids B) Liquids C) Gases D) All
Correct option is D) All
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Which of the following states the law of constant proportions ? A) Matter is neither created nor destroyed during a chemical reaction.
D) Compounds are formed when atoms of different elements combine in whole number ratios.
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Law of constant proportions was proposed by A) Antoine Lavoisier
B) Joseph L. Proust
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Homogeneous molecule from the following A) H2O
Correct option is B) N2
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Which of the following precipitates is formed on mixing sodium sulphate with barium chloride solution?
A) White precipitate of barium sulphate
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1. (a) Is ammonia more dense or less dense than air? (b) What property of ammonia is demonstrated by the Fountain Experiment? (c) Write the balanced equation for the reaction between ammonia and sulphuric acid. 2. Pick the odd member from the list giving reasons: (a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide. (b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide. 3. Give reasons for the following : (a) Liquid ammonia is used as a refrigerant in ice plants. (b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes. (c) Aqueous solution of ammonia gives a pungent smell. (d) Aqueous solution of ammonia conducts electricity.
(1) (a) ammonia is less dense than air (b) solubility in water (c) 2NH3 + H2SO4 → (NH4)2SO4 (2) (a) Ammonia → because - NH3 is basic while, SO2,HCl and CO2 are acidic oxides. (b) CuO,...
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When `KMnO_(4)` solution is added to hot oxalic acid solution the decoloursitation is slow in the beginning but becomes instantaneous after some time.
Correct Answer - A `(NH_(4))_(2)Cr_(2)O_(7)overset(Delta)(rarr)Cr_(2)O_(3)`
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