{"id":17293,"date":"2022-01-17T19:50:24","date_gmt":"2022-01-17T14:20:24","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=17293"},"modified":"2024-10-08T12:04:38","modified_gmt":"2024-10-08T06:34:38","slug":"study-materials-jee-main-previous-year-papers-questions-with-solutions-chemistry-elements-of-p-block-groups-13-14-15-16-17-18","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/jee-main\/previous-year-papers-questions-with-solutions\/chemistry\/elements-of-p-block-groups-13-14-15-16-17-18\/","title":{"rendered":"JEE Main Previous Year Papers Questions With Solutions Chemistry Elements of p-Block: Groups 13,14,15,16,17 and 18"},"content":{"rendered":"

1. When H2<\/sub>S is passed through Hg2<\/sub>S, we get(2002)<\/strong>
\n(1)HgS 2) HgS + Hg2<\/sub>S<\/strong>
\n3) Hg2<\/sub>S 4) Hg2<\/sub>S2<\/sub><\/strong>
\nAns.<\/strong>
\n\"jee-main-previous-year-papers-questions-with-solutions-chemistry-elements-of-p-block-groups-1314151617-and-18-1\"<\/p>\n

2. Alum helps in purifying water (2002)<\/strong>
\n(1)forming Si complex with clay particles<\/strong>
\n(2) sulphate part, which combines with the dirt and removes it<\/strong>
\n(3)coagulating the mud particles<\/strong>
\n(4)making mud water soluble<\/strong>
\nAns. <\/strong>(3) Alum furnished Al3+<\/sup> ions which bring about coagulation of negatively charged clay particles, bacteria, etc.<\/p>\n

3. In the case of nitrogen, NC13<\/sub> is possible but not NC1S,<\/sub> while in the case of phosphorous, PC13<\/sub> and PC15<\/sub> are possible. It is due to the (2002)<\/strong>
\n(1)availability of vacant d orbitals in P but not in N<\/strong>
\n(2)lower electronegativity of P than N<\/strong>
\n(3)lower tendency of H-bond formation in P than in N<\/strong>
\n(4)occurrence of P in solid while N in a gaseous state at room temperature<\/strong>
\nAns.<\/strong>(1) 7<\/sub>N2<\/sup> =ls2<\/sup>2s2<\/sup>3p3<\/sup>, 15<\/sub>P = 1 s2<\/sup>2s2<\/sup>2p6<\/sup>3s2<\/sup>3p3 <\/sup>In phosphorous the 3d \u2013 orbitals are available<\/p>\n

4. Number of sigma bonds in P4<\/sub>O10<\/sub> is (2003)<\/strong>
\n(1)6 2) 1 3) 17 4) 16 Ans.<\/strong>
\nAns.
\n\"jee-main-previous-year-papers-questions-with-solutions-chemistry-elements-of-p-block-groups-1314151617-and-18-4\"<\/strong><\/p>\n

5. What happens when phosphine gas is mixed with chlorine gas? (2003)<\/strong>
\n(1)PC13<\/sub> and HC1 are formed, and the mixture warms up<\/strong>
\n(2)PC15<\/sub> and HC1 are formed, and the mixture cools down<\/strong>
\n(3)PH3<\/sub>.C12<\/sub> is formed with warming up<\/strong>
\n(4)The mixture only cools down<\/strong>
\nAns.<\/strong>
\n\"jee-main-previous-year-papers-questions-with-solutions-chemistry-elements-of-p-block-groups-1314151617-and-18-5\"<\/p>\n

6. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite. (2003)<\/strong>
\n(1)is an alio tropic form of diamond<\/strong>
\n(2)has molecules of variable molecular masses like polymers<\/strong>
\n(3)has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds.<\/strong>
\n(4)is a non-crystalline substance.<\/strong>
\nAns.<\/strong>(1) 4HC\/ + 02\u2013><\/sub> 2Cl2<\/sub> + 2H2<\/sub>0 cloud of white fumes.<\/p>\n

7. Concentrated hydrochloric acid, when kept in the open air, sometimes produces a cloud of white fumes. The explanation for it is that (2003)<\/strong>
\n(1)oxygen in the air reacts with the emitted HC1 gas to form a cloud of chlorine gas<\/strong>
\n(2) The strong affinity of HC1 gas for moisture in air results in the formation of droplets of a liquid solution, which appears like a cloudy smoke.<\/strong>
\n(3)due to a strong affinity for water. Concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.<\/strong>
\n(4)concentrated hydrochloric acid emits strongly smelling HC1 gas.<\/strong>
\nAns. <\/strong>(3) Layers are held together.<\/p>\n


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