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91. The method to purify the colloidal solution is (NTSE Uttar Pradesh, Stage-I, 2016-17)

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92. Match the following:
Column-I Column-II
a. Strongest reducing agent in solution (i) Thallium
b. Shows inert pair effect (ii) Caesium
c. Forms peroxide on heating with excess of air (iii) Lithium
d. Used in photoelectric cells (iv) Sodium (NTSE Haryana, Stage-I, 2016-17)

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93. What is the volume of N2 gas formed at STP when 63 g of (NH4)2Cr207 is thermally decomposed according to the equation given below?(Atomic mass of Cr = 52, H = 1, N = 14, 0=16)

(NH4)2Cr2O7 → N2 + 4H2O + Cr20 3  (NTSE Kerala, Stage-I, 2016-17) 

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94. Which of the following are not correct for a gaseous reversible reaction when pressure is increased? (a) Distance between gaseous molecules decreases (b) Number of molecules per unit volume decreases (c) Reaction proceeds in the direction in which there is increase in number of moles (d) Reaction proceeds in the direction in which there is decrease in number of moles Select the correct alternative (NTSE Kerala, Stage-I, 2016-17)

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95. 10 g of hydrogen is burnt in the presence of excess oxygen. The mass of water formed is (NTSE Jharkhand, Stage-I, 2016-17)

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