Tiêu đề 07. THE P-BLOCK ELEMENTS.pdf ✅

(1.) Which of the following statements is/are correct regarding the Group‐15 elements? [Page: 170] (a) In Group‐15, nitrogen and phosphorus are non‐metals. (b) As we go down the group, there is shift non-metallic to metallic from character. (c) Arsenic and antimony are typical metal. (d) both (a) and (b) (2.) By percentage molecular nitrogen comprises in atmosphere. [Page: 170] (a) 65% (b) 76% (c) 78% (d) 48% (3.) Nitrogen occurs in the Earth’s crust in the form of. [Page: 171] (a) sodium nitrate (b) potassium nitrate (c) nitric acid (d) both (a) and (b) (4.) Which of the following is a synthetic radioactive Element? [Page: 171] (a) Arsenic (b) Antimony (c) Moscovium (d) Bismuth (5.) Which is the following depicts the correct order of melting points for Group‐15 elements [Page: 171] (a) N P As Sb Bi     (b) N P As Sb Bi     (c) N P As Sb Bi     (d) NSb>Bi (6.) The correct order of ionic radii for 3 3 Sb , Bi + + and 3 As + is: [Page: 172] (a) 3 3 3 As Sb Bi + + +   (b) 3 3 3 Bi As Sb + + +   (c) 3 3 3 Sb Bi As + + +   (d) 3 3 3 Bi Sb As + + +   (7.) Arsenic forms covalent bonds with: [Page: 172] (a) carbon (b) oxygen (c) hydrogen (d) all of these.
(8.) Ionisation enthalpy decreases down the group due to gradual increase in: [Page: 172] (a) atomic radii (b) atomic size (c) electronegativity (d) lanthanide contraction. (9.) It is to and that Group‐15 elements have some common oxidation states. The most common oxidation states of this group are: [Page: 172] (a) − + 3and 3 (b) + + 3and 5 (c) − + 5and 5 (d) + − 3and 5 (10.) In Group‐15, the melting point increases up to — and then decreases up to — [Page: l73] (a) bismuth, arsenic (b) arsenic, bismuth (c) arsenic, antimony (d) phosphorus, bismuth (11.) The anomalous behavior of nitrogen from other members of the family in several properties due to its: [Page: 173] (a) small size (b) high ionization enthalpy (c) high electronegativity (d) all of the above (12.) Which of the statement regarding nitrogen is/are Incorrect? [Page: 173] (a) Due to its small size and high electro‐ negativity can from pπ pπ − multiple bond with itself and with other elements. (b) Elements of Group‐15 from hydrides of EH3 type. (c) The stability of hydrides increases from NH3 to BiH . 3 (d) Oxides formed by the elements of nitrogen family have general formula E2 3 O and E O2 5 where E N1 family elements. (13.) Nitrogen is restricted to a maximum covalence of. [QR Code, NCERT Exemplar, Page: 173] (a) 6 (b) 5 (c) 3 (d) 4 (14.) Nitrogen exists as a diatomic molecule with a: [Page: 173] (a) double bond
(b) triple bond (c) single bond (d) all of these (15.) The reason for not forming pentahalide of nitrogen is: [Page: 174] (a) availability of d‐orbitals in its valence shell (b) availability of d‐orbitals in its valence shell (c) non‐availability of p‐orbitals with valence shell (d) non‐availability of d‐orbitals in its valence shell. (16.) In case of nitrogen, which of the following is known to be stable [QR Code, NCERT Exemplar, Page: 174] (a) NF3 (b) NO2 (c) NH3 (d) Ca N3 2 (17.) The compound having −3 oxidation state to form their binary compounds in: [Page: 174] (a) Mg Bi 3 2 (b) HNO3 (c) H O2 (d) NO (18.) Match the following columns and choose the correct option from the codes given below. [Page: 168] Column‐I Column‐II (i) ( ) 6 5 3 As C H (p) single bond formation (ii) NH3 (q) ligand (iii) BiH3 (r) strong reducing agent (iv) Antimony (s) mild reducing agent I II III IV (a) q s r p (b) p q r s (c) s r q p (d) r s p q (19.) Which of the following nitrogenous organic matter results the formation of ammonia [Page: 175] (a) Formaldehyde (b) Ammonia chloride (c) Urea
(d) Ammonium carbonate (20.) 20. Which of the following reaction depicts the formation of ammonia on small scale? [Page: 175] (a) ( ) 2 2 2 4 3 3 2 2 2 NH CONH 2H O NH CO 2NH H O CO + → + + (b) ( ) 4 3 2 2 2 2NH Cl Ca OH 2NH 2H O CaCl + → + + (c) N 3H 2NH 2 2 3 + (d) None (21.) The optimum condition for the production of ammonia are a pressure of. [Page: 176] (a) 10 300 10 Pa  (b) 5 200 10 Pa  (c) 6 400 10 Pa  (d) 11 200 10 Pa  (22.) Iron oxide increase the rate of attainment of equilibrium with addition to: [Page: 176] (a) K O2 (b) Al O2 3 (c) Na SO 2 4 (d) Both (a) and (b) (23.) The shape of ammonia is: [Page: 176] (a) square planar (b) trigonal pyramidal (c) tetrahedral (d) none (24.) Ammonia is associated through which one of the following bonds in the liquid and solid state? [Page: 176] (a) Covalent bond (b) Hydrogen bond (c) Ionic bond (d) Both (b) and (c) (25.) Which of the following makes ammonia molecule a Lewis base? [Page: 176] (a) Lone pair electron on hydrogen (b) Lone pair electron on nitrogen (c) Reaction with oxide (d) Reaction with hydroxide