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

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

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

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

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) $\to$ C₁₂H₂₂O₁₁ (s)

1. 138.5

2. 155.5

3. 172.5

4. 199.4

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

How many moles of KMnO₄ are needed to oxidize a mixture of 1 mole of each FeSO₄ & FeC₂O₄ in acidic medium

1. $\frac{4}{5}$

2. $\frac{5}{4}$

3. $\frac{3}{4}$

4. $\frac{5}{3}$

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

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) $\stackrel{}{\rightleftharpoons }$ 2CuI(s) + I₂(aq) The iodine liberated required 24.5cm³ of a 0.100 mole dm^-3 solution of sodium thiosulphate 2S₂O₃^2- (aq) + I₂(aq) $\underset{}{\overset{}{\to }}$ 2I^– (aq) + S₄O₆^2- (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

Oxygen contains 90% O¹⁶ and 10% O¹⁸. Its atomic mass is

(1) 17.4

(2) 16.2

(3) 16.5

(4) 17