On heating blue coloured powder of copper(Il) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas 'X' is formed. Identify the brown gas 'X'.
1 Answers
Talk Doctor Online in Bissoy App
A study found that children with light - coloured eyes are likely to have parents with light coloured eyes.
In this study, a light-coloured eye is a dominant trait because children born from parents having light-coloured eyes also had light-coloured eyes.
1 Answers 1 views
Will CCl4 give white precipitate of AgCl on heating it with silver nitrate? Give reason for your answer.
CCl4 will not give the white precipitate of AgCl on heating it with silver nitrate. This is because the chlorine atoms are covalently bonded to carbon in CCl4. To obtain...
1 Answers 1 views
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
On heating the powder, it will char if it is a sugar. Alternatively, the powder may be dissolved in water and checked for its conduction of electricity. If it conducts,...
1 Answers 1 views
On adding dilute HCI to copper oxide powder, the solution formed is blue- green.
The new compound formed is copper(II) chloride (CuCl2), which imparts blue-green colour to the solution. CuO + 2HCl ------> CuCl2 + H2O copper oxide copper (II)chloride ...
1 Answers 1 views
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it.
(a) When sulphur is heated in air, sulphur dioxide gas is formed. (i) Sulphur dioxide has no action on dry litmus paper. (ii) Sulphur dioxide turns blue litmus paper to red. (b) S(s)...
1 Answers 1 views
A test tube contains a brown coloured liquid. The colour of the liquid in test tube remains
The element present in the liquid is bromine
1 Answers 1 views
On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and brown gas (X) is formed.
(a) 2Cu(NO3)2 → 2CuO+ 4NO2+O2 (b) The brown gas 'X' has to be nitrogen dioxide. (c) This type of reaction falls under the category of Decomposition reactions. (d) The pH of the aqueous...
1 Answers 1 views
A student takes sodium hydrogen carbonate powder in a test tube and pours 4-5 drops of acetic acid over it.
(B) bubbles of a colourless and odourless gas
1 Answers 1 views
A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object,
(c) Real, inverted, diminished and in blue shade
1 Answers 1 views
Water rises in a vertical capillary tube upto a length of 10 cm. If the tube is inclined at 45°, the length of water risen in the tube will be
The correct answer is (b) 10√2 cm Explanation: When the tube is inclined, the vertical rise remains the same. So the water in the inclined tube rises to 10*sec45° =10√2 cm.
1 Answers 1 views