The average atomic mass of chlorine using the following data would be -

The number of moles of hydrogen atoms present in 3 moles of ethane (C₂H₆), will be-

20 g of sugar is dissolved in enough water to make a final volume of 2L. The concentration of sugar (C₁₂H₂₂O₁₁) in mol L^–1  will be

2. 0.029 mol/L

If the density of methanol is 0.793 kg L^–1, the volume needed for making 2.5 L of its 0.25 M solution would be 

2. 24.78 mL

The level of contamination in water is 15 ppm (by mass of chloroform). Chloroform in the water sample would have a molality of

If the speed of light is 3.0 × 10⁸ m s^–1, then the distance covered by light in 2.00 nanoseconds will be -

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 mol A reacts with 3 mol B
iii. 100 atoms of A reacts with 100 molecules of B
iv. 5 mol A reacts with 2.5 mol B
v. 2.5 mol A reacts with 5 mol B
Choose the correct option

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

15.15 pm in the basic unit will be 

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

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 -

The mass of one ¹²C atom in g is -

The number of significant figures present in the answer of the following calculations [ (i), (ii), (iii)]  are respectively -
i. $\frac{0.02856 \times 298.15 \times 0.112}{0.5785}$
ii. 5 × 5.364
iii. 0.0125 + 0.7864 + 0.0215

The molar mass of naturally occurring Argon isotopes is 

1. 49.99947 g mol^-1 

The highest number of atoms is present in -

(2) 52 u of He

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 -

The mass of CaCO₃ required to react completely with 25 mL of 0.75 M HCl according to the given reaction would be
CaCO_3(s) + HCl_(aq) ➡ CaCl_2(aq) + CO_2(g) + H₂O_(l) 

Amount of HCl that would react with 5.0 g of manganese dioxide, as per the given reaction will be
4HCl_(aq) + MnO_2(s) ➡ 2H₂O_(l) + MnCl_2(aq) + Cl₂₍₂₎

16 g of oxygen has the same number of molecules as in-

(a) 16 g of CO

(b) 28 g of N₂

(c) 14 g of N₂

(d) 1.0 g of H₂

Unitless term among the following is/are-

(a) Molality

(b) Molarity

(c) Mole fraction

(d) Mass per cent

The correct match is 

Which of the following figures does not represent 1 mole of dioxygen gas at STP?

(a) 16 g of gas

(b) 22.7 L of gas

(c) $6.022\times {10}^{23}$ dioxygen molecules

(d) 11.2 L of gas

The correct choice among the above is -

The numbers 234,000 and 6.0012 can be represented in scientific notation as -

The number of significant figures in the numbers 5005, 500.0, and 126,000 are, respectively: 

0.50 mol ${\mathrm{Na}}_2{\mathrm{CO}}_3$ and 0.50 M ${\mathrm{Na}}_2{\mathrm{CO}}_3$ are different because -

Round up the following number into three significant figures: 
i. 10.4107  ii. 0.04597 respectively  are 

The following data was obtained when dinitrogen and dioxygen react together to form different compounds:

The law of chemical combination applicable to the above experimental data is:

An organic compound contains 80% (by wt.) carbon and the remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1] 

The molecular formula of a commercial resin used for exchanging ions in water softening is ${\mathrm{C}}_8{\mathrm{H}}_7{\mathrm{SO}}_3\mathrm{Na} \left(\mathrm{Mol}. \mathrm{Wt}. 206\right)$. The maximum uptake of ${\mathrm{Ca}}^{2+}$ ions by the resin when expressed in mole per gram resin is-

 SI unit of Mole fraction is -