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JEE Chemistry Solved Question Paper 2016

Multiple Choice Questions

1.
With what velocity should an $α$ -particle travel towards the nucleus of a copper atom to arrive at a distance of 10^-13m from the nucleus of the copper atom?(K = 9x 10⁹Nm²/C² (Mass of $α$ -particle = 6.64 x 10^-27kg).

634 x 10⁶ ms^-1

634 x10⁵ms^-1

5.34 x 10⁶ ms^-1

534 x 10⁵ ms^-1

634 x 10⁶ ms^-1

The potential energy of the $α$ -particle at a distance of 10^-13 m from the nucleus of the copper atom is

$E = \frac{{Kq}_{1} q_{2}}{r} K = 9 \times 10^{9} N . m^{2} / C^{2} q_{1} = 29 \times 16 \times 10^{- 19} coulomb (For copper atom) q_{2} = 2 \times 16 \times 10^{- 19} coulomb (For α - particles) r = 10^{- 13} m E = \frac{9 \times 10^{9} \times 29 \times 16 \times 10^{- 19} 2 \times 16 \times 10^{- 19}}{10^{- 13}} = 1.336 \times 10^{- 13} N . M The α - particle must have such kinetic energy K . E = E or \frac{1}{2} {mν}^{2} = 1.336 \times 10^{- 13} or ν^{2} = \frac{2 \times 1.336 \times 10^{- 13}}{6.64 \times 10^{- 27}} or v = 6.34 \times 10^{6} {ms}^{- 1}$

What is the ratio of the velocities of CH₄ and O₂ molecules so that they are associated with de-Broglie waves of equal wavelengths?

1:2
2: 1
3: 2
1: 2

What is the value of the spin quantum number of the last electron ford d⁹ -configuration ?

0
$- \frac{1}{2}$
$\frac{1}{2}$
1

Nitrogen forms stable N₂ molecule, but phosphorus is converted to P₄ from P₂ because

$pπ - pπ$ bonding is strong in phosphorus
$pπ - pπ$ bonding is weak in phosphorus
double bond is present in phosphorus
single P-P bond is weaker than N-N bond

In which of the following reactions will $∆$ U be equal to $∆$ H?

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l)$
$H_{2} (g) + I_{2} (g) \to 2 HI (g)$
$N_{2} O_{4} (g) \to 2 {NO}_{2} (g)$
$2 {SO}_{4} (g) + O_{2} (g) \to 2 {SO}_{3} (g)$

What is the conjugate base of OH ?

O₂
H₂O
O^-
O^2-

An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolarises aqueous solution of acidified KMnO₄gas (Y)reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z are

X Y Z

C CO CO₂
X Y Z

S SO₂ SO₃
X Y Z

P P₂O₃ P₂O₅
X Y Z

S SO₃ H₂SO₄

A black power when heated with conc. HCl gives a greenish yellow gas. The gas acts as an oxidising and a bleaching agent. When it is passed are slaked lime, a white power is formed which is a ready source of gas. The black powder and white power respectively are