The molecular formula of a commercial resin used for exchanging

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 Multiple Choice QuestionsMultiple Choice Questions

1.

20 mL solution of 0.1 M ferrous sulphate was completely oxidised using a suitable oxidising agent. What is the number of electrons exchanged?

  • 1.204 x 1022

  • 193

  • 1930

  • 1.204 x 1021


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2.

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na ( mol. wt = 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?

  • 1/103

  • 1/206

  • 2/309

  • 2/309


D.

2/309

We know the molecular weight of C8H7SO3Na
= 12x8+1x7+32+16x3+23 = 206
we have to find mole per gram of resin
therefore,
1 g of C8H7SO3Na has number of mole


=1/206 mol

Taking the reaction,
C8H7SO3Na + Ca2+ → (C6H7SO3)2Ca + 2Na+
therefore, 2 moles of C8H7SO3Na  combines with 1 mol of Ca2+
Thus, 1 mole of C8H7SO3Na will combine with 0.5 mol of Ca2+
Hence, 1/206 mole of C8H7SO3Na will combine with,
 0.5 x (1/206)mol of Ca2+ = 1/412 mol Ca2+

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3.

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)

  • 24

  • 36

  • 48

  • 48

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4.

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2.The empirical formula of the hydrocarbon is 

  • C2H4

  • C3H4

  • C6H5

  • C6H5

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5.

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in its oxide. The fraction of the metal which exists as M3+ would be:

  • 7.01%

  • 4.08%

  • 6.05%

  • 6.05%

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6.

The most abundant element by mass in the body of a healthy human adult are :
Oxygen (61.4%) ; Carbon (22.9%), Hydrogen(10.0%) ; and Nitrogen (2.6%). The weight which a 75 kg person would gain if all 1H atoms are replaced by 2H atoms is

  • 15 kg

  • 37.5 Kg

  • 7.5 Kg

  • 7.5 Kg

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7.

How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?

  • 0.02

  • 3.125 × 10–2

  • 1.25 × 10–2

  • 1.25 × 10–2

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8.

If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will 

  • Decrease twice

  • Increase two fold

  • Remain unchanged

  • Remain unchanged

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9.

The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6: 1. If one molecule of the above compound (CXHYOZ) contains half as much oxygen as required to burn one molecule of compound CXHY completely to CO2 and H2O. The empirical formula of compound CXHYOZ is

  • C2H4O3

  • C3H6O3

  • C2H4O

  • C3H4O2


10.

0.126 g of an acid is needed to completely neutralise 20 mL 0.1 (N) NaOH solution. The equivalent weight of the acid is

  • 53

  • 40

  • 45

  • 63


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