Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
Which one of the following species has a plane triangular shape?
0.33% of iron (by weight) is present in hemoglobin (Molecular wt = 67200). The number of iron atom(s) in one molecule will be:
The maximum number of molecules is present in:
Find the molarity of liquid HCl if the density of liquid HCl is $1.17\text{ g/cc}$.
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 will be:
An organic compound contains 80 % (by wt.) carbon and the remaining percentage of hydrogen. The empirical formula of this compound is: [Atomic wt. of C is 12, H is 1]
Match List-I with List-II: | List-I (Quantities) | List-II (Corresponding Values) | | :--- | :--- | | (a) 4.48 litres of $O_2$ at STP | (i) 0.2 mole | | (b) $12.022 \times 10^{22}$ molecules of $H_2O$ | (ii) $12.044 \times 10^{23}$ molecules | | (c) 96 g of $O_2$ | (iii) 6.4 g | | (d) 88 g of $CO_2$ | (iv) 67.2 litres at STP | (Given - Molar volume of a gas at STP = 22.4 L)
Among the following, isoelectronic species are:
Which of the following contains the highest number of helium atoms?
A 1 M solution of a compound 'X' has a density of 1.25 g/mL. If the molar mass of compound X is 85 g, what is the molality (m) of the solution?
Which of the following contains the maximum number of atoms?
The number of water molecules is maximum in:
$10\text{ g}$ of hydrogen and $64\text{ g}$ of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:
The number of atoms in $0.1\text{ mole}$ of a triatomic gas is: ($N_A = 6.02 \times 10^{23}\text{ mol}^{-1}$)
Match List-I (Molecules) with List-II (Shapes): List-I: (a) $PCl_5$ (b) $SF_6$ (c) $BrF_5$ (d) $BF_3$ List-II: (i) Square pyramidal (ii) Trigonal planar (iii) Octahedral (iv) Trigonal bipyramidal Choose the correct answer from the options given below:
The volume of oxygen gas ($\text{O}_2$) needed to completely burn $1 \text{ L}$ of propane gas ($\text{C}_3\text{H}_8$) (both $\text{O}_2$ & propane measured at $0^\circ\text{C}$ and $1 \text{ atm}$) will be:
Which of the following species has a linear shape?
The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic mass $16$ is:
An electron-deficient compound among the following is:
Which of the following species contains three bond pairs and one lone pair around the central atom?