Nitrogen gas is obtained by thermal decomposition of :

Given below are two statements : Statement I : The pentavalent oxide of group-15 element, E2O5, is less acidic than trivalent oxide, E2O3, of the same element. Statement II : The acidic character of trivalent oxide of group 15 elements, E2O3, decreases down the group. In light of the above statements, choose most appropriate answer from the options given below :

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Fluorine forms one oxoacid. Reason R : Fluorine has smallest size amongst all halogens and is highly electronegative. In the light of the above statements, choose the most appropriate answer from the options given below :

Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} List-I (Anion) List-II (gas evolved on reaction with dil.H$${}_2$$SO$${}_2$$) (A) CO$${}_3^{2-}$$ I. Colourless gas which turns lead acetate paper black. (B) S$${}^{2-}$$ II. Colourless gas which turns acidified potassium dichromate solution green. (C) SO$${}_3^{2-}$$ III. Brown fumes which turns acidified KI solution containing starch blue. (D) NO$${}_2^{-}$$ IV. Colourless gas evolved with brisk effervescence, which turns lime water milky. Choose the correct answer from the options given below :

Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-1wig{font-weight:bold;text-align:left;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List - I (Si-Compounds) List - II (Si-Polymeric/Other Products (A) $$(C{H}_3{)}_{4}Si$$ (I) Chain Silicone (B) $$(C{H}_3)Si(OH{)}_3$$ (II) Dimeric Silicone (C) $$(C{H}_3{)}_{2}Si(OH{)}_2$$ (III) Silane (D) $$(C{H}_3{)}_{3}Si(OH)$$ (IV) 2D - Silicone Choose the correct answer from the options given below :

Heating white phosphorus with conc. NaOH solution gives mainly :

Choose the correct stability order of group 13 elements in their + 1 oxidation state :

The correct order of melting points of hydrides of group 16 elements is :

Consider the following reaction : A + alkali $$\to$$ B (Major Product) If B is an oxoacid of phosphorus with no P-H bond, then A is :

Which of the following elements is considered as a metalloid?

The oxide which contains an odd electron at the nitrogen atom is :

The number of bridged oxygen atoms present in compound B formed from the following reactions is Pb(NO3)2 \buildrel {673\,K} \over \longrightarrow A + PbO + O2 A \buildrel {Dimerise} \over \longrightarrow B

White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of :

PCl5 is well known, but NCl5 is not. because,

Identify the correct statement for B2H6 from those given below : (A) In B2H6, all B-H bonds are equivalent. (B) In B2H6, there are four 3-centre-2-electron bonds. (C) B2H6 is a Lewis acid. (D) B2H6 can be synthesized from both BF3 and NaBH4. (E) B2H6 is a planar molecule. Choose the most appropriate answer from the options given below :

The most stable trihalide of nitrogen is :

Which one of the following elemental forms is not present in the enamel of the teeth?

A $$\stackrel{573K}{⟶}$$ Red phosphorus $$\underset{underpressure}{\overset{heat;803K}{⟶}}$$ B Red phosphorus is obtained by heating "A" at 573 K, and can be converted to "B" by heating at 803 K under pressure. A and B, respectively, are

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-1wig{font-weight:bold;text-align:left;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List I List II (A) N$${}_2$$(g) + 3H$${}_2$$(g) $$\to$$ 2NH$${}_3$$(g) (I) Cu (B) CO(g) + 3H$${}_2$$(g) $$\to$$ CH$${}_4$$(g) + H$${}_2$$O(g) (II) Cu/ZnO $$-$$ Cr$${}_2$$O$${}_3$$ (C) CO(g) + H$${}_2$$(g) $$\to$$ HCHO(g) (III) Fe$${}_x$$O$${}_y$$ + K$${}_2$$O + Al$${}_2$$O$${}_3$$ (D) CO(g) + 2H$${}_2$$(g) $$\to$$ CH$${}_3$$OH(g) (IV) Ni Choose the correct answer from the options given below :