In order to form large amount of carbon compounds which major elements are used other than hydrogen and oxygen?

In which form zinc metal is used from labooratory to prepare hydrogen?

What is the simplest formula of the compound which has the following percentage composition carbon 80% , hydrogen 20% , if the molecular mass is 30. calculate its molecular formula ?

Using the periodic table, predict the formulae of compounds which might be formed by the following pair of elements, i) silicon and bromine ii) aluminum and sulpur.

About 98 per cent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:

A mixed oxide of iron and chromium, FeO.Cr_2O_3 is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify the compounds (A) and (B) .

A mixed oxide of iron and chromium, FeO.Cr_2O_3 is fused with sodium carbonate in the presence of air to form a yellow compound (A). On acidification, the compound (A) forms an orange coloured compound (B) which is a strong oxidising agent. Identify write balanced chemical equations for each step.

Which of the following is a secondary cell? Dry cell Leclanche cell Mercury cell None of these One of the fuel cell uses the reaciton of hydrogen and oxygen to form water. Write down the cell reaction taking place in the anode and cathode of that fuel cell.

Sugars are technically called carbohydrats, referring to the fact that their formulae are only multiple of C (H_2O) . Hexoses therefore have six carbons, twelve hydrogens and six oxygen atoms. Glucose is a hexose. Choose form among the following another hexose.