Important Questions of Some Basic Concepts of Chemistry Chemistry | Zigya

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31.

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd.

  • 118

  • 112

  • 106.5

  • 53.25


32.

How many 'mL' of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 L of SO2 gas to SO3 gas?

  • 10 mL

  • 5 mL

  • 20 mL

  • 30 mL


33.

The cubic unit cell of a metal (molar mass = 63.55 g mol-1) has an edge length of 362 pm. Its density is 8. 92 g cm-3. The type of unit cell is

  • primitive

  • face centred

  • body centred

  • end centred


34.

The number of hydrogen atoms present in 25.6 g of sucrose (C12H22O11) which has a molar mass of 342.3 g is

  • 22 × 1023

  • 9.91 × 1023

  • 11 × 1023

  • 44 × 1023 H atoms


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35.

The number of formula units of calcium fluoride, CaF2 present in 146.4 g of CaF(the molar mass of CaF2is 78.08 g/mol) is

  • 1.129 × 1024 CaF2

  • 1.146 × 1024 CaF2

  • 7.808 × 1024 CaF2

  • 1.877 × 1024 CaF2


36.

The amount of energy released when 20 mL of 0.5 M NaOH are mixed with 100 mL of 0.1 M HCl is x kJ. The heat of neutralisation is (in kJ mol-1).

  • -100x

  • -50x

  • +100x

  • +50x


37.

Two organic compounds (A) and (B) both containing only carbon and hydrogen, on quantitative analysis gave the same percentage composition by weight

C=1213 × 100 % H= 113 × 100%

A decolourises bromine water but B does not. A and B respectively are

  • C2H2 and C6H6

  • C6H6 and C2H2

  • C2H4 and C2H6

  • C2H2 and C2H6


38.

How many grams of dibasic acid (mol. wt. 200) should be present in 100 mL of the aqueous solution to give 0.1 N?

  • 10 g

  • 20 g

  • 2 g

  • 1 g


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39.

At STP, a container has 1 mole of Ar, 2 moles of CO2, 3 moles of O2, and 4 moles of N2. Without changing the total pressure if one mole of O2 is removed, the partial pressure of O2 is

  • changed by about 16%

  • halved

  • changed by 26%

  • unchanged


40.

In a compound C, H and N are present in 9 : 1 : 3.5 by weight. If molecular weight of the compound is 108, then the molecular formula of the compound is

  • C2H6N2

  • C3H4N

  • C6H8N2

  • C9H12N3


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