MCQ Questions for Class 12 Chemistry with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these The p-Block Elements Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\nThe p-Block Elements Class 12 MCQs Questions with Answers<\/h2>\n
Solving the The p-Block Elements Multiple Choice Questions of Class 12 Chemistry Chapter 7 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on The p-Block Elements Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 7 Chemistry Class 12 and cross-check your answers during preparation.<\/p>\n
Question 1.
\nWhich of the following compounds contains S=O and S=S bonds?
\n(a) Sulphuric acid
\n(b) Thiosulphuric acid
\n(c) Sulphurous acid
\n(d) Thiosulphurous acid.<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) Thiosulphuric acid<\/p>\n<\/details>\n
\nQuestion 2.
\nWhich of the following halogen shows only negative oxidation state?
\n(a) Chlorine
\n(b) Bromine
\n(c) Fluorine
\n(d) Iodine<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Fluorine<\/p>\n<\/details>\n
\nQuestion 3.
\nWhich of the following is the strongest acid?
\n(a) H2<\/sub>O
\n(b) H2<\/sub>S
\n(c) H2<\/sub>Se
\n(d) H2<\/sub>Te<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) H2<\/sub>Te<\/p>\n<\/details>\n
\nQuestion 4.
\nThe oxoacid of halogen having maximum acidic character is
\n(a) HCl4<\/sub>
\n(b) HClO3<\/sub>
\n(c) HClO2<\/sub>
\n(d) HClO<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) HCl4<\/sub><\/p>\n<\/details>\n
\nQuestion 5.
\nWhich of the following oxide of nitrogen is called laughing gas?
\n(a) NO2<\/sub>
\n(b) N2<\/sub>O
\n(c) N2<\/sub>O3<\/sub>
\n(d) N2<\/sub>O5<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) N2<\/sub>O<\/p>\n<\/details>\n
\nQuestion 6.
\nAmong the following, which is the strongest oxidising agent?
\n(a) Br2<\/sub>
\n(b) l2<\/sub>
\n(c) Cl2<\/sub>
\n(d) F2<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) F2<\/sub><\/p>\n<\/details>\n
\nQuestion 7.
\nThe basicity of H2<\/sub>PO2<\/sub> is
\n(a) 1
\n(b) 2
\n(c) 3
\n(d) 4<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) 1<\/p>\n<\/details>\n
\nQuestion 8.
\nThe basicity of phosphorous acid H3<\/sub>PO3<\/sub> is
\n(a) Two
\n(b) Three
\n(c) One
\n(d) Zero<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) Two<\/p>\n<\/details>\n
\nQuestion 9.
\nWhich of the following is a neutral oxide of nitrogen?
\n(a) N2<\/sub>O
\n(b) N2<\/sub>O5<\/sub>
\n(c) NO2<\/sub>
\n(d) N2<\/sub>O4<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) N2<\/sub>O<\/p>\n<\/details>\n
\nQuestion 10.
\nAmong the trihalides of nitrogen, which one is least basic?
\n(a) Nl3<\/sub>
\n(b) NBr3<\/sub>
\n(c) NCl3<\/sub>
\n(d) NF3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) NF3<\/sub><\/p>\n<\/details>\n
\nQuestion 11.
\nThe correct order of thermal stability of hydrogen halides (HX) is
\n(a) HI > HBr > HCl > HF
\n(b) HF > HCl > HBr > HI
\n(c) HCl < HF < HBr < HI
\n(d) HI > HCl > HF > HBr<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) HF > HCl > HBr > HI<\/p>\n<\/details>\n
\nQuestion 12.
\nMaximum covalency of nitrogen is:
\n(a) 3
\n(b) 5
\n(c) 4
\n(d) 6<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) 4<\/p>\n<\/details>\n
\nQuestion 13.
\nIn the following compounds which has minimum boiling point?
\n(a) H2<\/sub>Se
\n(b) H2<\/sub>Te
\n(c) H2<\/sub>O
\n(d) H2<\/sub>S<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) H2<\/sub>S<\/p>\n<\/details>\n
\nQuestion 14.
\nThe shape of XeF4<\/sub> is
\n(a) square planar
\n(b) tetrahedral
\n(c) square pyramidal
\n(d) trigonal bipyramidal<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) square planar<\/p>\n<\/details>\n
\nQuestion 15.
\nIn the following which is dibasic acid?
\n(a) H3<\/sub>PO4<\/sub>
\n(b) H3<\/sub>PO3<\/sub>
\n(c) H3<\/sub>PO2<\/sub>
\n(d) HClO4<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) H3<\/sub>PO3<\/sub><\/p>\n<\/details>\n
\nQuestion 16.
\nIn the following strongest reducing agent is:
\n(a) PH3<\/sub>
\n(b) BiH3<\/sub>
\n(c) SbH3<\/sub>
\n(d) ASH3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) BiH3<\/sub><\/p>\n<\/details>\n
\nQuestion 17.
\nOn addition of cone. H2<\/sub>SO4<\/sub> to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because
\n(a) H2<\/sub>SO4<\/sub> reduces Hl to l2<\/sub>
\n(b) Hl is of violet colour
\n(c) Hl gets oxidised to l2<\/sub>
\n(d) Hl changes to HlO3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Hl gets oxidised to l2<\/sub><\/p>\n<\/details>\n
\nQuestion 18.
\nIn qualitative analysis, when H2<\/sub>S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3<\/sub>, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives
\n(a) deep blue precipitate of Cu (OH)2<\/sub>
\n(b) deep blue solution of [Cu(NH3<\/sub>)4<\/sub>]2+<\/sup>
\n(c) deep blue solution of Cu(NO3<\/sub>)2<\/sub>
\n(d) deep blue solution of Cu(OH)2<\/sub>. CU(NO3<\/sub>)2<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) deep blue solution of [Cu(NH3<\/sub>)4<\/sub>]2+<\/sup><\/p>\n<\/details>\n
\nQuestion 19.
\nIn a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?
\n(a) 3 double bonds; 9 single bonds
\n(b) 6 double bonds; 6 single bonds
\n(c) 3 double bonds; 12 single bonds
\n(d) Zero double bonds; 12 single bonds<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) 3 double bonds; 12 single bonds<\/p>\n<\/details>\n
\nQuestion 20.
\nWhich of the following elements can be involved in p\u03c0-d\u03c0 bonding?
\n(0) Carbon
\n(b) Nitrogen
\n(c) Phosphorus
\n(d) Boron<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Phosphorus<\/p>\n<\/details>\n
\nQuestion 21.
\nWhich of the following pairs of ions are isoelectronic and isostructural?
\n(a) CO\\(_{ 3 }^{2-}\\), NO\\(_{ 3 }^{-}\\)
\n(b) ClO\\(_{ 3 }^{-}\\), CO\\(_{ 3 }^{2-}\\)
\n(c) SO\\(_{ 3 }^{2-}\\), NO\\(_{ 3 }^{-}\\)
\n(d) ClO\\(_{ 3 }^{-}\\), SO\\(_{ 3 }^{2-}\\)<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) CO\\(_{ 3 }^{2-}\\), NO\\(_{ 3 }^{-}\\)<\/p>\n<\/details>\n
\nQuestion 22.
\nAffinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
\n(a) HF
\n(b) HCl
\n(c) HBr
\n(d) HI<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) HF<\/p>\n<\/details>\n
\nQuestion 23.
\nBond dissociation enthalpy of E-H (E = element) bonds is given below. Which of the compounds will act as strongest reducing agent?
\n
\n(a) NH3<\/sub>
\n(b) PH3<\/sub>
\n(c) ASH3<\/sub>
\n(d) SbH3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (d) SbH3<\/sub><\/p>\n<\/details>\n
\nQuestion 24.
\nOn heating with concentrated NaOH solution in an inert atmosphere of CO2<\/sub>, white phosphorus gives a gas. Which of the following statement is incorrect about the gas?
\n(a) It is highly poisonous and has smell like rotten fish.
\n(b) Its solution in water decomposes in the presence of light.
\n(c) It is more basic than NH3<\/sub>.
\n(d) It is less basic than NH3<\/sub>.<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) It is more basic than NH3<\/sub>.<\/p>\n<\/details>\n
\nQuestion 25.
\nWhich of the following acids forms three series of salts?
\n(a) H3<\/sub>PO2<\/sub>
\n(b) H3<\/sub>BO3<\/sub>
\n(c) H3<\/sub>PO4<\/sub>
\n(d) H3<\/sub>PO3<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) H3<\/sub>PO4<\/sub><\/p>\n<\/details>\n
\nQuestion 26.
\nStrong reducing behaviour of H3<\/sub>PO2<\/sub> is due to
\n(a) Low oxidation state of phosphorus
\n(b) Presence of two -OH groups and one P-H bond
\n(c) Presence of one -OH group and two P-H bonds
\n(d) High electron gain enthalpy of phosphorus<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (c) Presence of one -OH group and two P-H bonds<\/p>\n<\/details>\n
\nQuestion 27.
\nOn heating lead nitrate forms oxides of nitrogen and lead. The oxides formed are
\n(a) N3<\/sub>O, PbO
\n(b) NO3<\/sub>, PbO
\n(c) NO, PbO
\n(d) NO, PbO2<\/sub><\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (b) NO3<\/sub>, PbO<\/p>\n<\/details>\n
\nQuestion 28.
\nWhich of the following elements does not show allotropy?
\n(a) Nitrogen
\n(b) Bismuth
\n(c) Antimony
\n(d) Arsenic<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) Nitrogen<\/p>\n<\/details>\n
\nQuestion 29.
\nWhich of the following statements is wrong?
\n(a) Single N-N bond is stronger than the single P-P bond.
\n(b) PH3<\/sub> can act as a ligand in the formation of coordination compound with transition elements.
\n(c) NO2<\/sub> is paramagnetic in nature.
\n(d) Covalency of nitrogen in N2<\/sub>O5<\/sub> is four.<\/p>\n\nAnswer<\/span><\/summary>\nAnswer: (a) Single N-N bond is stronger than the single P-P bond.<\/p>\n<\/details>\n
\nQuestion 30.
\nA brown ring is formed in the ring test for NO3<\/sub>–<\/sup> ion. It is due to the formation of
\n(a) [Fe(H2<\/sub>O)5<\/sub> (NO)]2+<\/sup>
\n(b) FeSO4<\/sub>. NO2<\/sub>
\n(c) [Fe(H2<\/sub>O)4<\/sub>(NO)2<\/sub>]2+<\/sup>
\n(d) FeSO4<\/sub>.HNO3<\/sub><\/p>\n