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JEE 2018 :: Chemistry (2018) :: Solved questions (2018)




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31.

Glucose on prolonged heating with HI gives


A) n-hexane

B) 1-hexane

C) Hexanoic acid

D) 6-iodohexanal



32.

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluroide ion is required to make teeth enamel harder by converting [3Ca3(PO4)2.Ca (OH)2]  to


A) [$CaF_{2}$]

B) [$3(CaF_{2}).Ca(OH)_{2}$]

C) [$3Ca_{3}(PO_{4})_{2}.CaF_{2}$]

D) [3{$Ca_{3}(PO_{4})_{2}$}.$CaF_{2}$]



33.

The compound that does not proudce nitrogen gas by the thermal decomposition is


A) $Ba(N_{3})_{2}$

B) $(NH_{4})_{2}Cr_{2}O_{7}$

C) $(NH_{4})_{2}SO_{4}$

D) $NH_{4}NO_{2}$



34.

Which of the following salts is the most basic in aqueous solution?


A) $Al(CN)_{3}$

B) $CH_{3}COOK$

C) $FeCl_{3}$

D) $Pb(CH_{3}COO)_{2}$



35.

Which of the following compounds contain(s) no covalent bond(s)?

KCl,PH3,O2,B2H6,H2SO4


A) $KCl,B_{2}H_{6},PH_{3}$

B) $KCl,H_{2}SO_{4}$

C) $KCl$

D) $KCl,B_{2}H_{6}$



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