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What will the concentration of $[{Ca}^{+ 2}]$ in a sample of $1$ litre hard water if after treatment with washing soda $10 g$ insoluble ${CaCO}_{3}$ is precipitated.

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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-2>Q 1

A sample of Calcium phosphate

{Ca}_{3} {({PO}_{4})}_{2}

contains

8 mole

O

atoms. The number of

mol

Ca

atoms in the sample is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 2

64 g

of an organic compound has

24 g

of carbon and

8 g

of hydrogen and the rest is oxygen. The empirical formula of the compound is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 3

Formation of polyethylene from calcium carbide takes place as follows:

${CaC}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + C_{2} H_{2}$
$C_{2} H_{2} + H_{2} ⟶ C_{2} H_{4}$
${nC}_{2} H_{4} ⟶ {(- {CH}_{2} - {CH}_{2} -)}_{n}$
The amount of polyethylene obtained from $64.1 kg$ of ${CaC}_{2}$ is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 4

The hourly energy requirement of an astronaut can be satisfied by the energy released when

34 g

(C_{12} H_{22} O_{11})

of sucrose are burnt in his body. How many

g

of oxygen would be needed to be carried in space capsule to meet his requirement for one day:

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 5

If $10 g$ of $Ag$ reacts with $1 g$ of sulphur, the amount of ${Ag}_{2} S$ formed will be:

Atomic mass of $Ag : 108, S : 32$

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 7

When a mixture of

10

mole of

{SO}_{2}, 15

mole of

O_{2}

was passed over catalyst,

8

mole of

{SO}_{3}

was formed. How many mole of

{SO}_{2}

and

O_{2}

did not enter into combination?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 8

When

x

grams of carbon are heated with

y

grams of oxygen in a closed vessel, no solid residue is left behind. Which of the following statements is correct?

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-2>Q 9

When a

12 g

mixture of carbon and sulphur is burnt in air, then a mixture of

{CO}_{2}

and

{SO}_{2}

is produced, in which the number of moles of

{SO}_{2}

is half that of

{CO}_{2}

. The mass of the carbon in the mixture is:

What will the concentration of Ca+2 in a sample of 1 litre hard water if after treatment with washing soda 10 g insoluble CaCO3 is precipitated.

Important Questions on Some Basic Concepts of Chemistry

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What will the concentration of $[{Ca}^{+ 2}]$ in a sample of $1$ litre hard water if after treatment with washing soda $10 g$ insoluble ${CaCO}_{3}$ is precipitated.