Aavya and Vihan are studying the properties of metals in school. They decide to design and conduct an experiment to test the relative conduction of heat by metals. They use the apparatus (Figure) with rods of five different metals aluminium, silver, copper, iron and zinc attached to a central point. This central point is heated
Give reason for the following : A. A solution of sports electrolyte drink conducts electricity, but coconut oil does not.B. Milkiness disappears when excess of carbon dioxide is passed through lime water.C. An iron bridge near the sea rusts much faster than an iron bridge located in a dry hilly region.
Ramya performs an experiment in the following two steps: Step 1: Heats ethanol with conc. H₂SO₄ at 170°C to get product A.Step 2: Passes hydrogen gas over product A, using Ni as a catalyst and gets product B. (i) Name the products A and B.(ii) Write the reactions involved in both the steps.
Ramya performs an experiment in the following two steps: Read More »
An organic compound “X” with formula \(C_2H_6O\) is used to blend with petrol in order to reduce the dependence on fossil fuels and lower down the harmful emissions from the cars. It is also used as a solvent in medicines such as tincture iodine, cough syrups and many tonics. (i) Name the compound “X”. (ii)
Ramya performs an experiment in the following two steps: Step 1: Heats ethanol with conc. H₂SO₄ at 170°C to get product A.Step 2: Passes hydrogen gas over product A, using Ni as a catalyst and gets product B. (i) Name the products A and B.(ii) Write the reactions involved in both the steps.
Ramya performs an experiment in the following two steps: Read More »
An organic compound “X” with formula \(C_2H_6O\) is used to blend with petrol in order to reduce the dependence on fossil fuels and lower down the harmful emissions from the cars. It is also used as a solvent in medicines such as tincture iodine, cough syrups and many tonics. (i) Draw the electron dot structure
Carbon forms millions of compounds whereas silicon, which is just below it in the Periodic Table, forms a few compounds. Explain the reason for the difference in their ability to form compounds
The following question consists of two statements – Assertion (A) and Reason (R). Answer this question by selecting the appropriate option given below: A. Both A and R are true, and R is the correct explanation of A.B. Both A and R are true, and R is not the correct explanation of A.C. A is
Electrical wires made of aluminum A. corrode easily as aluminium is a very reactive metal. B. corrode easily because porous flaky aluminium oxide is formed. C. do not corrode easily as aluminium oxide forms a protective layer. D. do not corrode easily as aluminium is less reactive than metals like sodium, magnesium and zinc.
In the food industry nitrogen is used as a/anA. preservative.B. oxidising agent.C. antioxidant.D. colouring agent