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The most suitable vessel for storing concentrated sulphuric acid is
What is the element that is in the highest percentage in the composition of the earth ?
The ratio of pure gold in 18 carat gold is :
Diamond is harder than graphite because of:
Gobar gas contains mainly:
Which of the following elements is non-radioactive ?
Which one of the following Organic compounds has fruity smell?
If there is no carbon dioxide in the earth’s atmosphere, the temperature of earth’s surface would be
Quartz is made of
What is the chemical name for ‘Baking Soda’ ?
Saccharin is made up of
Generally, what is the colour of emerald ?
PVC is obtained by the polymerisation of
Which variety of glass is heat resistant ?
What is the element required for solar energy conversion ?
Potassium permanganate is used for purifying drinking water, because it
Which of the following imparts deep blue colour to glass ?
Which of the following fibres catches fire least ?
Which of the following is used as filler in tyre of rubber ?
Which of the following elements is obtained from the sea algae?
Milk tastes sour when it is left in open for some time. This happens due to the formation of
The polymerisation of which of the following is used in manufacturing of polythene in industry ?
Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
Which of the following is not a component of chlorophyll ?
Cloud is a colloidal dispersion of
The fourth state of matter is “known as
Which of the following is the petroleum wax ?
Which variety of coal contains recognisable traces of the original plant material ?
Which is the purest form of iron ?
Which of the following metals form an amalgam with other metals ?
By-product obtained by soap-Industry is
Which one of the following is pure water?
Which silver salt is used for making film for photography?
Which is used for settling muddy water?
Which is widely used in the plastic industry for manufacturing bakelite?
Standard 18-carat gold sold in the market is
For determination of the age of which among the following is carbon dating method used?
A substance which readily forms colloidal solution in contact with water is called
Electron was discovered by
When formaldehyde and potassium hydroxide are heated, we get
Which of the following acids is manufactured using sawdust?
When conc H₂SO₄ is added to dry KNO₃, brown fumes are evolved. These fumes are due to
The polymer used in making plastic crockery is
Vulcanization of rubber is carried out by adding
Which of the following is used in dating archaeological findings?
Gobar gas (Biogas) mainly contains
Preparation of ‘Dalda or Vanaspati’ ghee from vegetable oil utilizes the following process:
Smoke is formed due to
Which of the following chemicals is used in photography?
Diamond and Graphite are