Q A Magnesium ribbon is burnt in the air to give a white compound 'X' Accompanied by emission of light. if the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound' Y'. (a)write the chemical formula of 'X' and 'Y'. (b) write a balance chemical equation when 'X' is dissolved in water.

A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y. (a) Write the chemical formulae of X and Y. (b) Write a balanced chemical equation, when X is dissolved in water.

At higher temperature sodium metal reacts with alumina to give a sodium compound 'X'.'X' is dissolved in water and then carbon dioxide gas is passed through it, a compound 'Y' is formed. The compound 'X' and 'Y' are respectively

(a) When a chromite ore (A) is fused with an aqueous solution of sodium carbonate in free excess of air, a yellow solution of compound (B) is obtained. This solution is filtered and acidified with sulphuric acid to form compound (C). Compound (C) on treatment with solution of KCl gives orange crystals of compound (D). Write the chemical formulae of compounds A to D. (b) Describe the cause of the following variations with respect to lanthanoids and actinoids: (i) Greater range of oxidation states of actinoids as compared to lanthanoids. (ii) Greater actinoid contraction as compared to lanthanoid contraction. (iii) Lower ionisation enthalpy of early actinoids as compared to the early lanthanoids.

Write the formula of the compound X formed when nitrogen and magnesium react together. Write the balanced equation for reaction.

When a substance 'X' was heated with slaked lime, a gas 'Y' with a pungent smell was formed. The gas y gave pink colouration to phenolphthalein. Write a balanced chemical equation for the reaction.

A gas X is formed when a substance Y is heated with concentrated sulphuric acid. The gas X turns wet blue litmus paper red and gives dense white fumes with ammonia. Write balanced chemical equation between Y and conc. H_2SO_4

An organic compound 'X' on heating with conc. H_(2)SO_(4) forms a compound 'Y' which on addition of one molecule ofhydrogen in the presence of nickel forms a compound 'Z'. One molecule of compound 'Z' on combustion forms two molecules of CO_2 and three molecules of H_(2)O . Identify, giving reasons the compounds X,Y and Z. write the chemical equations for the reactions involved.

A metal X ,which is used in thermit process , when heated with oxygen gives an oxide Y which is amphoteric in nature . Identify X and Y. Write balanced chemical equation of the reaction of oxide Y with hydrochloric acid and sodium hydroxide .

A gas 'X' combines with another gas 'Y' in the presence of a catalyst 'C' to form a colourless gas 'Z'. The gas Z gives dense white fumes with hydrogen chloride and turns red litmus blue. Write a balanced chemical equation for the formation of Z.

A metal 'X' has valency 2 & a non - metal 'Y' has a valency 3. If 'Y' is a diatornic gas ,write an equation for the direct combination of X&Y to form a compound.