NEET Chemistry Questions: P - Block Elements

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Which of the following statement in incorrect




$ 2Al(s) + 2 NaOH(aq) + 6H_2 O _{l} \rightarrow 2 Na^+ [ Al (OH)_4 ] ^ - _{(aq)} + 3 H_{2(g) } $ sodium tetra hydroxo aluminate (III)
Which of the following is nonmetal




Among the given options, boron (B) is the non-metal. Boron is a metalloid, which means it has properties intermediate between metals and nonmetals, but it is classified as a non-metal due to its chemical behavior and bonding characteristics.
Which one of the following statements about diborane is not true




In diborane ($B_2H_6$), there are two types of B-H bonds: terminal B-H bonds and bridging B-H bonds. The terminal B-H bonds are shorter (about 1.19 Å) compared to the bridging B-H bonds (about 1.33 Å). This difference is due to the presence of two 3-center-2-electron bonds in the bridging B-H bonds, which makes all B-H bond lengths not equal.
Boron shows single oxidation state due to absence of




Boron shows a single oxidation state of +3 primarily due to the absence of the inert pair effect. The inert pair effect is more significant in heavier elements, where the s-electrons of the outermost shell are less available for bonding. Since boron is a light element, it does not exhibit this effect, leading to its consistent +3 oxidation state.
Which of the following is non - existent




$BF_6^{2-}$ does not exist because boron cannot expand its octet to accommodate more than 8 electrons. In the $BF_6^{2-}$ ion, boron would have to accommodate 12 electrons, which is not possible due to its electron configuration and the lack of available d-orbitals.
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Which of the processes is used in thermite welding




Thermite welding is a process that uses the exothermic reaction between aluminum powder and a metal oxide, typically iron(III) oxide (Fe2O3). The reaction: $ 2Al + Fe_2O_3 ightarrow Al_2O_3 + 2Fe $ produces molten iron and aluminum oxide, which is used to weld railway tracks and other large metal parts. The intense heat generated by this reaction melts the metals, allowing them to fuse together when cooled.
In which of the following molecules is hydrogen bond absent




Hydrogen bonding occurs when hydrogen is covalently bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine. In water (H2O) and methanol (CH3OH), hydrogen bonds are present due to the hydrogen-oxygen bonds. In inorganic benzene (B3N3H6), hydrogen can form bonds with nitrogen. However, in diborane (B2H6), the hydrogen atoms are bonded to boron, which is not highly electronegative enough to form hydrogen bonds. Therefore, hydrogen bonding is absent in diborane.
The tendency of $ BF_3 , BCl_3 & BBr_3 $ to behave as lewis acid decreases in the sequence




No explanation available.
Which one of the following molecular hydrides acts a a lewis acid




Boron hydrides like $B_2H_6$ (diborane) act as Lewis acids because they have electron-deficient boron atoms. A Lewis acid is a species that can accept an electron pair. In $B_2H_6$, the boron atoms are in need of electrons to complete their octet, making it an effective Lewis acid.
Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards To the tin buttons of their uniforms. white metallic tin buttons got converted to grey powder. This Transformation is related to




Grey tin is very brittle & easily crumbles down to a powder in very cold climates $ Grey Tin \rightleftharpoons White Tin $ (Cubic) (Tetragonal) The change of white tin to grey is accompanied by increase in volume. This is called disease or tin Plague.
Which one of the following statements about the zeolites is false




Zeolite have $ SiO_4 \& AlO_4 $ tetrahadrones linked together in a three dimensional open structure in which four or six member ring predominate. Due to open chain structure they have cavities & can take up water & other small molecules.
Which of the following acts UV rays




Crook's glass is a special type of glass containain cerium oxide. It does not allow the passage of ultraviolate rays & is used for making lense.
The Stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence




Due to inert pair effect, stability of +2 oxidation state increases as we move down this group $ SiX_2 \lt GeX_2 \lt SnX_2 \lt PbX_2 $
Sodium oxalate on heating with conc $H_2SO_4$ gives




Sodium oxalate react with $ conc. H_2SO_4 to form CO \& CO_2 $ gas
Glass reacts with HF to produce




When glass, which is primarily composed of silicon dioxide ($SiO_2$), reacts with hydrofluoric acid (HF), it produces hexafluorosilicic acid ($H_2SiF_6$) along with water as a byproduct. The reaction is as follows: $SiO_2 + 6HF ightarrow H_2SiF_6 + 2H_2O$.