List of top Chemistry Questions on Stoichiometry and Stoichiometric Calculations

Observe the following reaction \[ xS_8 (s) + yOH^-(aq) \to zS^{2-}(aq) + 2S_2O_3^{2-}(aq) + 6H_2O(l) \] x, y and z are respectively.

x g of methane was burnt completely in the presence of oxygen. The liberated gases were passed into a solution containing 370 g of Ca(OH)$_2$. The weight of white precipitate obtained was 500 g. What is the value of x (in g)? (Given : C = 12; H = 1; Ca = 40; O = 16 u)

Observe the following reaction \[ \text{a} \, \text{P}_4(s) + \text{b} \, \text{OH}^-(aq) + \text{H}_2\text{O}(l) \rightarrow \text{c} \, \text{PH}_3(g) + \text{d} \, \text{H}_2\text{PO}_4^-(aq) \] a, b, c and d are respectively

The weight percentage of C and H in a hydrocarbon is in the ratio of 4:1. What is its empirical formula?

Match the reactions in List-I with the features of their products in List-II and choose the correct option

Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option.

	List-I		List-II
(P)	P₂O₃ + 3H₂O →	(1)	P(O)(OCH₃)Cl₂
(Q)	P₄ + 3NaOH + 3H₂O →	(2)	H₃PO₃
(R)	PCl₅ + CH₃COOH →	(3)	PH₃
(S)	H₃PO₂ + 2H₂O + 4AgNO₃ →	(4)	POCl₃
		(5)	H₃PO₄

In the following reactions, P, Q, R, and S are the major products.

The correct statement(s) about P, Q, R, and S is(are)

Match the electronic configurations in List-I with appropriate metal complex ions in List-II and choose the correct option.
[Atomic Number: Fe = 26, Mn = 25, Co = 27]

	List-I		List-II
(P)	$t^6_{2g} e^0_g$	(1)	$ [Fe(H_2O)_6]^{2+}$
(Q)	$t^3_{2g} e^2_g$	(2)	$ [Mn(H_2O)_6]^{2+}$
(R)	$e^2t^3_{2}$	(3)	$ [Co(NH_3)_6]^{3+}$
(S)	$t^4_{2g} e^2_g$	(4)	$[FeCl_4]^-$
		(5)	$ [CoCl_4]^{2-}$

15 g of $ \text{CaCO}_3 $ completely reacts with

Arrange the following in order of increasing mass :
(i) 1 mole of N₂, (ii) 0.5 mole of O₃, (iii) $3.011×10^{23}$ molecules of O₂, (iv) 0.5 gram atom of O₂

The strength of $50$ volume solution of hydrogen peroxide is _____$g / L$ (Nearest integer)
Given: Molar mass of $H _2 O _2$ is $34\, g \, mol ^{-1}$ Molar volume of gas at $STP =22.7\, L$

Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride The volume of hydrogen gas produced at STP from the reaction of $115 \, g$ of zine with excess $HCl$ is ___$L$ (Nearest integer)
(Given: Molar mass of $Zn$ is $654 \,g \,mol ^{-1}$ and Molar volume of $H _2$ at $STP =227 \,L$ )

When a hydrocarbon A undergoes combustion in the presence of air, it requirs 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

When $Fe _{0.93} O$ is heated in presence of oxygen, it converts to $Fe _2 O _3$ The number of correct statement/s from the following is
A. The equivalent weight of $Fe _{093} O$ is Molecular wejght $0.79$
B. The number of moles of $Fe ^{2+}$ and $Fe ^{3+}$ in 1 mole of $Fe _{0.93} O$ is $0.79$ and $014$ respectively
C. $Fe _{0.93} O$ is metal deficient with lattice comprising of cubic closed packed arrangement of $O ^{2-}$ ions
D. The $\%$ composition of $Fe ^{2+}$ and $Fe ^{3+}$ in $Fe _{093} O$ is $85 \%$ and $15 \%$ respectively

Find the correct stoichiometric coefficients in the following redox equation:
xH⁺ + yC₆H₅CH₃ + wMnO^-₄ → aH₂O + bMn²⁺ + tC₆H₅COOH

$SO _2 Cl _2$ on reaction with excess of water results into acidic mixture $SO _2 Cl _2+2 H _2 O \rightarrow H _2 SO _4+2 HCl$ 16 moles of $NaOH$ is required for the complete neutralisation of the resultant acidic mixture The number of moles of $SO _2 Cl _2$ used is :

What mass of 95% pure $CaCO_3$ will be required to neutralise 50 mL of 0.5 M $HCl$ solution according to the following reaction?
$CaCO_3(s) + 2HCl(aq) → CaCl_2(aq) + CO_2(g) + 2H_2O(l)$
[Calculate upto second place of decimal point]

Time required for completion of 90% of a first order reaction is ‘t’. What is the time required for completion of 99.9%of the reaction?

A metal ($M$) forms two oxides. The ratio $M:O$ (by weight) in the two oxides are $25:4$ and $25:6$. The minimum value of atomic mass of $M$ is

$C_6H_6(\text{liquid}) + \frac{15}{2} O_2(\text{gas}) \rightarrow 6 CO_2(\text{gas}) + 3 H_2O(\text{liquid})$ Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of $39$ grams of liquid benzene?

On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is ______. (Nearest Integer)

Two elements $A$ and $B$ which form $0.15$ moles of $A_2B$ and $AB_3$ type compounds. If both $A_2B$ and $AB_3$ weigh equally, then the atomic weight of $A$ is _____ times of atomic weight of $B$.

Match List-I with List-II, match the gas evolved during each reaction:

List-I		List-II
(A)	$\left( NH _4\right)_2 Cr _2 O _7 \xrightarrow{\Delta}$	(I)	$H _2$
(B)	$KMnO _4+ HCl \rightarrow$	(II)	$N _2$
(C)	$Al + NaOH + H _2 O \rightarrow$	(III)	$O _2$
(D)	$NaNO _3 \xrightarrow{\Delta}$	(IV)	$Cl _2$

Choose the correct answer from the options given below:

For the following reaction scheme, percentage yields are given along the arrow:

$X\, g$ and $y \,g$ are mass of $R$ and $U$, respectively (Use : Molar mass (in $g \,mol^{-1})$ of $H, C$ and $O$ as $1, 12$ and $16$, respectively) The value of $x$ is ______

For the following reaction scheme, percentage yields are given along the arrow:

$X\, g$ and $y \,g$ are mass of $R$ and $U$, respectively (Use : Molar mass (in $g \,mol^{-1})$ of $H, C$ and $O$ as $1, 12$ and $16$, respectively) The value of $y$ is _______

	List-I		List-II
(P)	(-)-1-Bromo-2-ethylpentane (single enantiomer)	(1)	Inversion of configuration
(Q)	(-)-2-Bromopentane (single enantiomer)	(2)	Retention of configuration
(R)	(-)-3- Bromo-3-methylhexane (single enantiometer)	(3)	Mixture of enantiomers
(S)	(single enantiometer)	(4)	Mixture of structural isomers
		(5)	Mixture of diastereomers

	List-I		List-II
(P)	\(t^6_{2g} e^0_g\)	(1)	\( [Fe(H_2O)_6]^{2+}\)
(Q)	\(t^3_{2g} e^2_g\)	(2)	\( [Mn(H_2O)_6]^{2+}\)
(R)	\(e^2t^3_{2}\)	(3)	\( [Co(NH_3)_6]^{3+}\)
(S)	\(t^4_{2g} e^2_g\)	(4)	\([FeCl_4]^-\)
		(5)	\( [CoCl_4]^{2-}\)