Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 12

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Earn 100

${KCIO}_{3}$ decomposes by two parallel reactions,

( $i$ ) $2 {KClO}_{3} \overset{Δ}{⟶} 2 KCl + 3 O_{2}$ ( $i i$ ) $4 {KClO}_{3} \overset{Δ}{⟶} 3 {KClO}_{4} + KCl$

If $3$ moles of $O_{2}$ and $1 mol$ of ${KClO}_{4}$ is produced along with other products, then determine the initial moles of ${KClO}_{3}$ .

Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 13

A

2 g

sample containing

{Na}_{2} {CO}_{3}

and

{NaHCO}_{3}

looses

0.248 g

when heated to

300 ° C

, the temperature at which

{NaHCO}_{3}

decomposes to

{Na}_{2} {CO}_{3}, {CO}_{2}

and

H_{2} O

. What is the percentage of

{Na}_{2} {CO}_{3}

in the given mixture?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 14

A sample of chalk contains clay as an impurity. The clay impurity loses

11 %

of its weight as moisture on prolong heating.

5

gram sample of chalk on heating shows a loss in weight (due to the evolution of

{CO}_{2}

and water) by

1.1 g .

Calculate the

%

of chalk

({CaCO}_{3})

in the sample. [Hint : Chalk

({CaCO}_{3})

release

{CO}_{2}

on heating]

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 15

Find the mass of

KOH

needed to prepare

100 ml 1 M KOH

solution. [At. mass

K = 39

]

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 16

Calculate the molality of the

KCl

solution prepared by dissolving

7.45 g

of

KCl

to make

500 mL

of the solution.

(d_{sol} = 1.2 {gmL}^{- 1})

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 17

Find the ${Cl}^{-}$ concentration in solution which is obtained by mixing one mole each of ${BaCl}_{2}, NaCl$ and $HCl$ in $500 ml$ water.

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 18

What volume of water should be added to $50 ml$ of ${HNO}_{3}$ having density $1.5 {gml}^{- 1}$ and $63.0 %$ by weight to have one molar solution?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 19

What maximum volume of

3 M

solution of

KOH

can be prepared from

1 L

each of

1 MKOH

and

6 M KOH

solutions by using water?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-1>Q 20

Under the same conditions of P and T, two gases have the same number of molecules. They must ________.