Stoichiometry

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Q. 3 g of

M g

is burnt in a closed vessel containing 3 g of oxygen. The weight of excess reactant left is:

2 M g + O_{2} \to 2 M g O

0.5 g of oxygen
0.5 g of $M g$
1.0 g of $M g$
1.0 g of oxygen

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Q. 60 mL of mixture of equal volumes of

C l_{2}

and an oxide of chlorine, i.e.,

C l_{2} O_{n}

was heated and then cooled back to the original temperature, The resulting gas mixture was found to have volume of 75 mL. On treatment with KOH solution, the volume contracted to 15 mL. Assume that all measurements are made at the same temperature and pressure. Deduce the value of n in

C l_{2} O_{n}

the oxide of

C l_{2}

on heating decomposes quantitatively to

O_{2}

and

C l_{2}

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Q. The correct structure of 2, 6-Dimethyl-dec-4-ene is:

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Q. How many moles of

C O_{2}

will be produced when

10 m o l

N a H C O_{3}

is decomposed?

2 N a H C O_{3}

\to

N a_{2} C O_{3}

H_{2} O

C O_{2}

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Q. If one mole of ammonia contains "

y

" number of atoms, then how many atoms do

1

mole of glucose contain?

$0.5 y$
$6 y$
$2 y$
$3 y$

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Q. How many moles of

C O_{2}

will be produced when

10 m o l

N a H C O_{3}

is decomposed?

2 N a H C O_{3}

\to

N a_{2} C O_{3}

H_{2} O

C O_{2}

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Q. How many moles of

S O_{2}

can be made by using

0.5 m o l

S_{8}

in the following reaction?

S_{8}

8 O_{2}

\to

8 S O_{2}

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Q. The hydrated salt

N a_{2} C O_{3} . x H_{2} O

undergoes

63 %

loss in mass on heating and becomes anhydrous. The value of

x

is: (report the answer to the closest integer)

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Q. How many moles of magnesium phosphate,

M g_{3} (P O_{4})_{2}

will contain 0.25 mole of oxygen atoms?

$3.125 \times 10^{- 2}$
$1.25 \times 10^{- 2}$
$0.02$
$2.5 \times 10^{- 2}$

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Q. Two elements C and D combine to form two compounds

C_{x} D_{y}

and

C_{y} D_{x}

. 0.5 mol of

C_{y} D_{x}

weigh 40 g and 1 molecule of

C_{x} D_{y}

weigh

1.66 \times 10^{- 25}

kg. The atomic weight of C and D are 20 and 40 respectively. Find the value of x and y respectively.

3, 2
1, 3
1, 2
2, 2

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Q. A

0.60 g

sample consisting of only

C a C_{2} O_{4}

and

M g C_{2} O_{4}

is heated at

500^{o} C,

converting the two salts of

C a C O_{3}

and

M g C O_{3} .

The sample then weighs

0.465 g

. If the sample had been heated to

900^{o} C

and the products are

C a O

and

M g O

, what would the mixtures of oxides have weighed?

$0.21 g$
$0.252 g$
$0.12 g$
$0.3 g$

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C l_{2} + 2 K O H \to K C l + K C l O + H_{2} O

3 K C l O \to 2 K C l + K C l O_{3}

4 K C l O_{3} \to K C l + 3 K C l O_{4}

2 moles of chlorine gas reacted with an excess of potassium hydroxide and 50 g of potassium perchlorate was obtained. Calculate the percentage yield of perchlorate in the reaction.
Molar mass of potassium perchlorate = 138.5 g/mol

72 %
60 %
90 %
49 %

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Q. A magnesium ribbon, when burnt in air, left an ash containing

M g O

and

M g_{3} N_{2}

. The ash was found to consume 0.6 mole of HCl, when it was taken in solution, according to the following reaction:

M g_{3} N_{2}

8 H C l

\to

3 M g C l_{2}

2 N H_{4} C l

The solution obtained was treated with excess of

N a O H

, when

0.1 m o l e

N H_{3}

was evolved. The mass (in

g

) of magnesium burnt is

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Q. In a

S_{N} 2

substitution reaction of the type:

R - B r + C l^{-} D M F - -- \to R - C l + B r^{-}

which one of the following has the highest relative rate?

$C H_{3} C H_{2} C H_{2} B r$
$C H_{3} C H_{2} B r$
$(C H_{3}) 3 C C H_{2} B r$
$(C H_{3})_{2} C H C H_{2} B r$

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Q. 60 mL of mixture of equal volumes of

C l_{2}

and an oxide of chlorine, i.e.,

C l_{2} O_{n}

C l_{2} O_{n}

the oxide of

C l_{2}

on heating decomposes quantitatively to

O_{2}

and

C l_{2}

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Q. Match List-I with List-II :

List-I	List-II
Elements	Properties
(a) Li	(i) Poor water solubility of $I^{-}$
(b) Na	(ii) Most abundant element in cell fluid
(c) K	(iii) Bicarbonate salt used in fire extinguisher
(d) Cs	(iv) Carbonate salt decomoses easily on heating

Choose the correct answer from the options given below :

JEE MAIN 2021

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Q. Two elements C and D combine to form two compounds

C_{x} D_{y}

and

C_{y} D_{x}

. 0.5 mol of

C_{y} D_{x}

weigh 40 g and 1 molecule of

C_{x} D_{y}

weigh

1.66 \times 10^{- 25}

kg. The atomic weight of C and D are 20 and 40 respectively. Find the value of x and y respectively.

3, 2
1, 3
1, 2
2, 2

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Q. Consider the following balanced reaction with minimum integral coefficients.

x F e S_{2} + y N a_{2} O_{2} + z H_{2} S O_{4} \to p N a_{2} F e O_{4} + q N a_{2} S O_{4} + r H_{2} O

Find the correct option(s):

x = 2, p = 2
y = 4, p =1
y = 9, r = 6
z = 6, q = 8

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Q. Consider the following balanced reaction:

x A s_{2} S_{3} + y M n (N O_{3})_{2} + z K_{2} C O_{3} \to a K_{3} A s O_{4} + b K_{2} S O_{4} + c K_{2} M n O_{4} + d N O + f C O_{2}

Find the correct option(s)

$x = 1, y = 14, z = 20$
$a = 2, b = 3, c = 14$
$x = 1, y = 7, c = 7$
$x = 1, y = 1, a = 1$

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Q. Consider the following balanced reaction with minimum integral coefficients.

x F e S_{2} + y N a_{2} O_{2} + z H_{2} S O_{4} \to p N a_{2} F e O_{4} + q N a_{2} S O_{4} + r H_{2} O

Find the correct option(s):

x = 2, p = 2
y = 4, p =1
y = 9, r = 6
z = 6, q = 8

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C l_{2} + 2 K O H \to K C l + K C l O + H_{2} O

3 K C l O \to 2 K C l + K C l O_{3}

4 K C l O_{3} \to K C l + 3 K C l O_{4}

72 %
60 %
90 %
49 %

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Q. The vapour density of a gaseous mixture containing only

A r

and

N_{2} O_{4}

gases is

40

. When the mixture is left for some time, the vapour density is decreased and finally becomes

(37.5)

. It happened due to the dissociation of some

N_{2} O_{4}

into

N O_{2}

(A r = 40)

. What is the degree of dissociation of

N_{2} O_{4} ?

$0.870$
$0.780$
$0.087$
Data is insufficient for calculation

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Q. If

1 \frac{1}{2}

moles of oxygen combine with Al to form

A l_{2} O_{3}

, the weight of Al used in the reaction is: (atomic wt of Al = 27 u)

27 g
54 g
40.5 g
81 g

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