How many protons are present in 1.8g of NH4+ :-

(1) NA

(2) 1.2 NA

(3) 1.1 NA

(4) 11 NA

Subtopic:  Moles, Atoms & Electrons |
 62%
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When 1L of CO2 is heated with graphite,the volume of the gases collected is 1.8L. What will be the number of moles of CO produced at STP?

1. 0.0357

2. 0.0714

3. 0.0803

4. 14

Subtopic:  Equation Based Problem |
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On reduction with CO, 200 kg of iron ore (Fe2O3) containing 20% impurities gives iron. The amount of iron produced will be-

1. 84 kg

2. 200 kg

3. 56 kg

4. 112 kg

Subtopic:  Equation Based Problem |
 58%
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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 |
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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 |
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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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