Target DPP Test

1.

6.02x10²⁰ molecules of urea are present in 100mL of its solution. The concentration of the solution is:

1.	0.02M	2.	0.01M
3.	0.001M	4.	0.1M

2.

In the Haber process, 30 L of dihydrogen and 30 L of dinitrogen were taken for the reaction, which yielded only 50% of the expected product. The composition of the gaseous mixture under the said conditions at the end is:
1. 20 L ammonia, 10 L nitrogen, 30 L hydrogen
2. 20 L ammonia, 25 L nitrogen, 15 L hydrogen
3. 20 L ammonia, 20 L nitrogen, 20 L hydrogen
4. 10 L ammonia, 25 L nitrogen, 15 L hydrogen

3.

The molality of a 15% (w/vol.) solution of H₂SO₄ of density 1.1g/cm³ is-
1. 1.2
2. 1.4
3. 1.8
4. 1.6

4.

Which mode of expressing concentration is independent of temperature?
1. Molality
2. Percent by mass
3. Mole fraction
4. All of the above

5.

The molality of 1M solution of NaCl ( specific gravity 1.0585 g/mL ) is:
1. 1.0585
2. 1.0
3. 0.10
4. 0.0585

6.

The total molarity of all the ions present in 0.1 M of CuSO₄ and 0.1 M of Al₂(SO₄)₃ solution is:
1. 0.2M
2. 0.7M
3. 0.8M
4. 1.2M

7.

If 0.5 moles of BaCl₂ is reacted with 0.2 moles of Na₃PO₄ then the maximum moles of Ba₃(PO₄)₂ formed is:

1.	0.33	2.	0.25
3.	0.10	4.	0.52

8.

10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:
1. 2 mol
2. 3 mol
3. 4 mol
4. 1 mol

9.

The moles of lead (II) chloride that will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl are:
1. 0.044
2. 0.333
3. 0.011
4. 0.029

10.

What volume of 75% alcohol by weight (d=0.80g/ $c m^{3}$ ) must be used to prepare 150 $c m^{3}$ of 30% alcohol by weight (d=0.90 g/ $c m^{3}$ )?
1. 67.5 mL
2. 56.25 mL
3. 44.44 mL
4. None of these

11.

In the given diagram, the paired open spheres represent

H_{2}

molecules and the paired solid spheres represent

N_{2}

molecules. When the molecules in the box react to form the maximum possible amount of ammonia (

N H_{3}

) molecules, what is the limiting reactant and how many molecules of

N H_{3}

can be formed?

1.	N₂ is a limiting reactant, 5 molecules of NH₃ can be formed
2.	N₂ is a limiting reactant, 10 molecules of NH₃ can be formed
3.	H₂ is a limiting reactant, 8 molecules of NH₃ can be formed
4.	H₂ is a limiting reactant, 12 molecules of NH₃ can be formed

12.

The density of a 2 M aqueous solution of NaOH is 1.28 g/ $c m^{3}$ . The molality of the solution is:
[molecular mass of NaOH = 40 $g m o l^{- 1}$ ]

1.	1.20 m	2.	1.56 m
3.	1.67 m	4.	1.32 m

13.

The mass of water formed when 10 g of H₂ is allowed to react completely with 70 g of oxygen is:
1. 78.84 g
2. 60.00 g
3. 70.65 g
4. 95.73 g

14.

50 ml of an aqueous solution of glucose contain $6.02 \times 10^{22}$ molecules, the concentration of solution is:
1. 0.1 M
2. 1 M
3. 0.2 M
4. 2 M

15.

Assertion (A):	In Haber's process, starting with 5 moles of N₂ and 2.5 mol of H₂, on complete reaction only 1.66 moles of NH₃ were produced.
Reason (R):	H₂ acts as a limiting reagent in this reaction.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

16.

Breakfast cereal is advertised to contain 110 mg of sodium per 100 grams of cereal. The percent of sodium in the cereal is:
1. 0.110%
2. 0.0110 %
3. 11.0%
4. 0.22 %

17.

If 0.50 mole of BaCl₂ is mixed with 0.20 mole of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is:
1. 0.10
2. 0.20
3. 0.30
4. 0.40

18.

Correct statement among the following regarding molality and molarity is/are:
1. Both represent the concentration of the solution
2. Molality is independent of temperature
3. Both depend on the volume
4. Both 1 and 2

19.

What is the mass per cent of carbon in carbon dioxide?

1.	0.034%	2.	27.27%
3.	3.4%	4.	28.7%

20. The number of molecules of H₂SO₄ present in 100 mL of 0.02 M H₂SO₄ solution are:

1. $12.044 \times 10^{20}$ molecules
2. $6.022 \times 10^{23}$ molecules
3. $1 \times 10^{23}$ molecules
4. $12.044 \times 10^{23}$ molecules

21.

1 M, 2.5 litre NaOH solution is mixed with another 0.5 M and 3 litre NaOH solution.
The molarity of the resultant solution is:

1.	0.80 M	2.	1.0 M
3.	0.73 M	4.	0.50 M

22.

In a reaction A + B₂ → AB_2,
A will act as a limiting reagent if :

i.	300 atoms of A reacts with 200 molecules of B
ii.	2 moles A reacts with 3 moles B₂
iii.	100 atoms of A reacts with 100 molecules of B
iv.	5 moles A reacts with 2.5 moles B
v.	2.5 moles A reacts with 5 moles B₂

Choose the correct option:
1. (i), (ii)
2. (i), (ii), (v)
3. (ii), (v)
4. All

23.

What would be the molarity of a solution of ethanol in water if the mole fraction of ethanol is 0.040?
(assume the density of water to be 1)
1. 3.143 M
2. 2.314 M
3. 2.413 M
4. 2.141 M

24.

The molality of 20% (mass/mass) aqueous solution of KI is:
(molar mass of KI = 166 g mol^–1)
1. 1.51
2. 7.35
3. 4.08
4. 2.48

25.

The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts
with 1 kg of dihydrogen is:

1.	3600 g	2.	3000 g
3.	3400 g	4.	4000 g

26.

How many grams of KCl would need to be dissolved in 60 g of H₂O to yield a solution with a concentration of 40% by weight?
1. 40 g
2. 20 g
3. 15 g
4. 10 g

27.

SI unit of molality is -
1. mol kg^–1
2. Nm^–1
3. mol L^–1
4. Unitless

28. 10.6 gm $Na_2CO_3 $ is dissolved in 250 ml $H_2O $ . The molarity of $Na^+ $ ions and $CO^{2-}_3$ in this solution, respectively, are:
1. 0.4 M and 0.2 M
2. 0.8 M and 0.4 M
3. 0.4 M and 0.4 M
4. 0.4 M and 0.8 M

29. The mass ratio of ethylene glycol (62 g/mol) required to make (500 ml, 0.25 M) and (250 ml, 0.25 M) solutions is:

1.	1:1	2.	1:2
3.	2:1	4.	4:1

30.

Assertion (A):	Mole fraction is a unitless quantity.
Reason (R):	Mole fraction is the ratio of the number of moles of a particular component to the total number of moles of the solution.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

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