On adding a piece of aluminium foil to blue coloured copper sulphate solution, copper will be deposited on aluminium foil. Then the solution
A) No change in colour
B) Becomes colourless
C) Turns to red
D) Turns to green
1 Answers
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If you touch a piece of wood and a piece of metal which were kept in the fridge for the same period of time then the result is
A) metal piece is colder than wooden piece
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Blue coloured blood is present in A) Frog B) Whale
Correct option is D) Snail
1 Answers 2 views
The sky appears blue because some of the blue component of sunlight is scattered by
A) gas molecules present in air
2 Answers 1 views
Mustard was growing in two fields- A and B. While Field A produced brown coloured seeds, field B produced yellow coloured seeds.
In field A, the reason for parental trait in consecutive generations of the offsprings is self-pollination. In field B, variation is seen to occur because of recombination of genes as cross...
2 Answers 6 views
The iron nail dipped in Copper Sulphate solution becomes brown and the blue colour of the Copper Sulphate solution fades.
D) Displacement
2 Answers 1 views
When a small piece of zinc metal is added to a solution of copper sulphate and on heating the products formed are ………………
B) ZnSO4 + Cu
2 Answers 1 views
If we weigh a piece of iron and a piece of wood of same size, iron will weigh more. The reason is
D) density of iron is more than the density of wood
2 Answers 1 views
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,...
2 Answers 1 views
Identify the odd one out and justify. Crystalline blue vitriol, crystalline common salt, crystalline ferrous sulphate, crystalline sodium carbonate.
Crystalline common salt is the odd one out, as it does not contain water of crystallisation. It is an ionic compound and ionic compounds are crystalline in nature and rest all...
2 Answers 1 views
Statement-1: When acidified zinc sulphate solution is electrolysed between zinc electrodes, it is zinc that is deposited at the cathode and no `H_(2)`
Correct Answer - A Statement-2 is the correct explanation of statement-1
2 Answers 3 views