The acid which contains four hydrogen atoms — (a) Formic acid (b) Sulphuric acid (c) Nitric acid (d) Acetic acid Open Answer »
A health food store has a large display of bracelets made of copper metal. The storekeeper claims that the copper atoms from the bracelet diffuse into the body and the wearer is protected against rheumatoid diseases. Kuber wants to buy a bracelet for his grandmother who is suffering from arthritis. But his friend Ramesh suggests him against it. He says that it is a superstitious belief and wearing any metal on the body does not cure someone of the disease. Answer the following questions based on the above information: (𝒊) Do you think that Kuber should agree to Ramesh’s advice and not buy the bracelet? Give one reason. (𝒊𝒊) What values are displayed by Ramesh through his suggestion? (𝒊𝒊𝒊) Suggest one activity to promote these values. Open Answer »
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting? Open Answer »
A big drop has volume 1.0 mL. How many molecules of water are there is this drop, If the density of water is 1g/mL? Open Answer »
A colorless liquid is thought to be a pure compound. Analysis of three samples of the material yield the following results.Mass of SampleMass of carbonMass of Hydrogen Sample 11.0 g0.862 g0.138 gSample 21.549 g1.335 g0.214 gSample 30.988 g0.852 g0.136 gCould the material be a pure compound? Open Answer »
Calculate the ratio between the mass of one atom of hydrogen and mass of one atom of silver. Open Answer »
In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula C6H12O6. How many grams of water would be required to produce 18 g of glucose? Compute the volume of water so consumed assuming the density of water to be 1g cm-3. Open Answer »