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

If 10 volumes of H₂ gas react with 5 volumes of O₂ gas, the volumes of water vapor produced would be:

1. 9

2. 8

3. 10

4. 11

15.15 pm in the basic unit will be 

1. 1.515 x 10^-12 m

2. 2.57 x 10^-11 m

3. 2.87 x 10^-11 m

4. 1.515 x 10^-11 m

Which will have the largest number of atoms among the following?

1. 1 g Au (s)

2. 1 g Na (s)

3. 1 g Li (s)

4. 1 g of Cl₂(g)

The molarity of a solution of ethanol in water having a mole fraction of ethanol is 0.040 (assume the density of water to be 1) would be -

1. 2.143 M

2. 2.314 M

3. 2.413 M

4. 2.141 M

The mass of one ¹²C atom in g is -

1. 1.393 x 10^-23

2. 1.993 x 10^-23

3. 1.773 x 10^-23

4. 1.593 x 10^-23

The number of significant figures present in the answer of the following calculations [(i), (ii), (iii)]  are respectively -

The molar mass of naturally occurring Argon isotopes is 

The highest number of atoms is present in -

1. 52 moles of Ar

2. 52 u of He

3. 52 g of He.

4. All of the above have the same number of atoms

Burning a small sample of welding gas (constituted of C and H only)  in oxygen gives 3.38 g carbon dioxide, 0.690 g of water, and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. Molecular formula of welding gas would be -

1. C₂H₂

2. C₂H₆

3. CH

4. C₂H₄