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JEE Chemistry Solved Question Paper 2015

Multiple Choice Questions

11.
A colourless water soluble solid A on heating gives equimolar quantities of B and C. B gives dense white fumes with HCl and C does so with NH₃. B gives brown precipitate with Nessler's reagent and C gives white precipitate with nitrates of Ag⁺, Pb⁺ and Hg⁺. A is

NH₄Cl

NH₄CO₃

NH₄NO₂

FeSO₄

NH₄Cl

A is NH₄Cl. It can be written as-

$\underset{A}{{NH}_{4} Cl} \overset{∆}{\to} \underset{B}{{NH}_{3}} + \underset{C}{HCl}$

$\underset{B}{{NH}_{3}} + HCl \to \underset{white fumes}{{NH}_{4} Cl}$

$\underset{B}{{NH}_{3}} + \underset{Nessler' s reagent}{2 K_{2} [{HgI}_{4}]} + 3 KOH \to \underset{of Millon' s reagent}{\underset{brown ppt . iodine}{H_{2} NHgO . HgI}} + 7 KI + H_{2} O$

$\underset{C}{HCl} + {MNO}_{3} \to \underset{white ppt .}{MCl} + {HNO}_{3}$ (M = Ag⁺, Pb⁺, Hg⁺)

12.

The IUPAC name of the given compound is-

4-ethyl-5,6,7,9-tetramethyldeca-2, 9-diene
7-ethyl-2,4,5,6-tetramethyldeca-1, 8-diene
7-ethyl-2,4,5,6-tetramethyldeca-1, 7-diene
7-(1-propenyl)-2,3,4,5-tetramethyl non-1-ene

13.

Caffeine has a molecular weight of 194 u. If it contains 28.9% by mass of nitrogen, number of atom of nitrogen in one molecular of caffeine is

14.

A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO₂ is passed through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The compound X is

Ca(HCO₃)₂
CaCO₃
NaHCO₃
Na₂CO₃

15.

In benzene, the triple bond consists of

one sp-sp sigma bond and two p-p pi bonds
two sp-sp sigma bonds and one p-p pi bond
one sp²-sp² sigma bond, one p-p pi bond
one sp²-sp² sigma bond, one sp²-sp² pi bond and one p-p pi bond

16.

With excess of water, both P₂O₅and PCl₅ give

H₃PO₃
H₃PO₂
H₃PO₄
H₄P₂O₇

17.

When copper is treated with a certain concentration of nitric acid, nitric oxide and nitrogen dioxide are liberated in equal volumes according to the equation,

xCu + yHNO₃ → Cu(NO₃)₂ + NO + NO₂ + H₂O

The coefficients of x and y are respectively

2 and 3
2 and 6
1 and 3
3 and 8

18.

A and B respectively are

Both
Both

19.

An alloy of copper, silver and gold is found to have copper atom constituting the ccp lattice. If silver atom occupy the edge centres and gold atom is present at body centred, the alloy has a formula