An element occupies group number 15 and period number 2 reacts with hydrogen under high pressure and in the presence of a catalyst it terms a hydride (A). In presence of excess of air and in the presence of platinum it forms an oxyacid (B). Identify the element, A and B.

Under pressure, (with hydrogen) in presence of nickel catalyst, benzene forms

An element occupies group number 1 and period number 3. This element heated in air gives compound A. With water it gives compound B - a strong base. With ammonia gives compound C, which is used as a reducing agent in organic chemistry. Identify the element A,B and C.

An element occupies group number 1 and period number 2. This element burns with air and forms compound A. With water, it gives compound B, with hydrogen it forms an ionic compound C. Identify the elements, A, B and C.

An element occupies group no.13 and period number 2 is an representative element of that group reacts with carbondioxide and forms an oxide (A). (A) reacts with CuSO_(4) give blue beads (B). Identify the element compound (A) and (B). Write the reaction.

An element occupies group No.16 and period number 2. This element on passing through silent electric discharge forms (A). (A) also reacts with lead sulphide and forms (B). (A) also reacts with BaO_(2) and forms (C). It reacts with H_(2)O_(2) and forms (D). Identify the element (A), (B), (C) and (D).

An element occupies group No.14 and period number 2 exists in different allotropic forms. One form of this element has lubricating property (A). Another form is the hardest substance (B). New allotrope of this element is named as Buckyball' (C) and it is superconducting. Identify the element, (A) (B) and (C).

AH_2 is formed when element A reacts with hydrogen. Then the number of electrons in valence shell of A are generally

Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the oxides of A, B and C is amphoteric basic and acidic respectively. The correct order of the atomic numbers of these elements is

Read the following passage and answer the questions that follow. Electron-precise compounds have the required number of electrons to write their conventional Lewis structures. All elements of group 14 form such compounds which are tetrahedral in geometry. Electron - rich hydrides have excess of electrons which are present as lone pairs. Elements of groups 15-17 form such compounds. Metallic hydrides are formed by many d-block and f-block elements. These hydrides conduct heat and electricity though not as efficiently as their parent metals do. They are non-stoichiometric. A non-stoichiometric hydride is formed by

Phosphorus reacts with SO_(2) CI_(2) to form PCI_(5) and X. At 723 K , HCI gas reacts with O_(2) in the presence of CUCI_(2) to form water and Y.Y reacts with X in water to form two acids A and B. What are A and B respectively ?