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PART - 1 CH - 2 Structure of Atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 2 Structure of Atom5 Marks
Question
Explain Heisenberg's uncertainty principle and also explain its importance.
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$2\text{NO}(\text{g})+\text{O}_2(\text{g})\rightleftharpoons2\text{NO}_2(\text{g});\Delta\text{H}=-17\text{KJ}$
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  2. Predict the effect of pressure decrease as a result of increased volume on the equilibrium concentration of NO2.
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  1. Out of different gases formed in Duma's method, which gas is not absorbed over an aqueous solution?
  2. What is function of K2SO4 and a little of CuSO4 added in Kjeldahl's flask?
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Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H2. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction,
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If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that $\text{p}_\text{co}=\text{p}_{\text{H}_2\text{O}}=4.0$bar, what will be the partial pressure of H2 at equilibrium?$\text{K}_\text{p}=10.1\text{ at }400^\circ\text{C}$
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Explain the different necessary steps to calculate the concentrations of different reactants and products at equilibrium for reversible reaction.
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Balance the following reactions by oxidation number method :
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Match Column I with Column II.
 
Column I
 
Column II
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Dumas method.
(a)
AgNO3
(ii)
Kjeldahl’s method.
(b)
Silica gel.
(iii)
Carius method.
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Nitrogen gas.
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Discuss the factors affecting electron gain enthalpy and the trend in its variation in the periodic table.
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1. Suggest a method to purify
i. a liquid which decomposes at its boiling point.
ii. kerosene oil containing water.
iii. camphor containing traces of common salt.
2. Giving justification, categorise the following molecules/ions as nucleophile or electrophile:
$
\begin{aligned}
& HS^{-}, BF_3, C_2 H_5 O^{-},\left(CH_3\right)_3 N:, \\
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\end{aligned}
$
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Following results are observed when sodium metal is irradiated with different wavelengths. Calculate (a) threshold wavelength and (b) Planck's constant.
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  1. Show that the circumference of Bohr's orbit for the H-atom is an integral multiple of the de-Broglie wavelength of electron revolving around the orbit.
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