At STP the moles of oxygen atoms in 2.8 L of CO2 gas is:-

1. 0.125

2. 0.25

3. 0.5

4. 1

Subtopic:  Moles, Atoms & Electrons |
 59%
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Identify the incorrect statement among the following:

1. 1 mol N-3 ions have 10 mole electrons

2. 1 mol O-2 ions have  6.023 x 1022 electrons

3. 1 mol CH4 has 10 mole protons

4. 1 mol water has 10 mole protons

Subtopic:  Moles, Atoms & Electrons |
 73%
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Mass of sucrose C12H22O11 produced by mixing 84 gm of carbon, 12gm of hydrogen and 56L. O2 at 1atm & 273 K according to give reaction, is C(s) + H2(g) +O2(g)  C12H22O11 (s)

1. 138.5

2. 155.5

3. 172.5

4. 199.4

Subtopic:  Moles, Atoms & Electrons |
 58%
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A mixture contains Na2CO3 and NaHCO3 and wt. of mixture is 10gm. Mixture on heating liberates 56ml of CO2 at S.T.P, wt of Na2CO3 in mixture is

1. 9.58 gm

2. 5 gm

3. 7.5 gm

4. 8 gm

Subtopic:  Equation Based Problem |
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How many moles of KMnO4 are needed to oxidize a mixture of 1 mole of each FeSO4 & FeC2O4 in acidic medium

1. 45

2. 54

3. 34

4. 53

Subtopic:  Moles, Atoms & Electrons |
 53%
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1.0 mol of Fe reacts completely with 0.65 mol of O2 to give a mixture of only FeO and Fe2O3. The mole ratio of ferrous oxide to ferric oxide is

(1) 2 : 2

(2) 4 : 3

(3) 1 : 2

(4) 2 : 7

Subtopic:  Equation Based Problem |
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The percentage of copper in a copper(II) salt can be determined by using a thiosulphate titration. 0.305 gm of a copper(II) salt was dissolved in water and added to, an excess of potassium iodide solution liberating iodine according to the following equation 2Cu2 (aq) + 4I (aq) 2CuI(s) + I2(aq) The iodine liberated required 24.5cm3 of a 0.100 mole dm-3 solution of sodium thiosulphate 2S2O32- (aq) + I2(aq) 2I (aq) + S4O62- (aq) the percentage of copper, by mass in the copper(ll) salt is. [Atomic mass of copper = 63.5]

(1) 64.2

(2) 51.0

(3) 48.4

(4) 25.5

Subtopic:  Moles, Atoms & Electrons |
 57%
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Oxygen contains 90% O16 and 10% O18. Its atomic mass is

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17

Subtopic:  Moles, Atoms & Electrons |
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The total number of electrons present in 1.6 gm. of methane is [IIT 1976; Roorkee 1985; CPMT 1987, 92]

(1) 6.02 × 1023

(2) 6.02 × 1022

(3) 6.02 × 1021

(4) 4.02 × 1020

Subtopic:  Moles, Atoms & Electrons |
 65%
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KClO3 on heating decomposes to KCl and O2. The volume of O2 at STP liberated by 0.1 mole KClO3 is

1. 4.36 L

2. 3.36 L

3. 2.36 L

4. None of these

Subtopic:  Equation Based Problem |
 73%
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