Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 10

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$50 g$ of $ZnS$ are strongly heated in air to effect partial oxidation and the resultant mass weighed $44 g$ . What is the ratio of $ZnO$ to $ZnS$ in the resultant mixture :(Given Atomic mass of $Zn - 65.40 u, S - 32 u, O - 16 u$ )

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Important Questions on Some Basic Concepts of Chemistry

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 12

In a gaseous reaction of the type

aA + bB \to cC + dD

, which is wrong :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 13

Iodobenzene

(C_{6} H_{5} I)

is prepared from aniline

(C_{6} H_{5} {NH}_{2})

in a two step process as shown below

C_{6} H_{5} {NH}_{2} + {HNO}_{2} + HCl \to C_{6} H_{5} N_{2} Cl + 2 H_{2} O, C_{6} H_{5} {N_{2}}^{+} {Cl}^{-} + KI \to C_{6} H_{5} I + N_{2} + KCl

In an actual preparation

9.30 g

of aniline was converted to

16.32 g

of iodobenzene. The percentage yield of iodobenzene is :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 15

The simplest formula of a compound containing

50 %

of element

X

(atomic mass

= 10

) and

50 %

of the element

Y

(atomic mass

= 20

) by weight is :

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 17

In the preceding problem, if the compound contains

12.8 %

nitrogen

9.8 %

sulphur how many nitrogen and sulphur atoms are present per atom of sodium:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 18

How many grams of urea on heating yield

10^{22}

molecules of biuret by the reaction:

2 CO {({NH}_{2})}_{2} ⟶ H_{2} N - CO - NH - CO - {NH}_{2} + {NH}_{3} ?

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 19

A certain compound has the molecular formula

X_{4} O_{6}

. If

10 g

of

X_{4} O_{6}

has

5.72 g

of

X

, atomic mass of

X

is:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 20

DNA has density

1.1 \frac{g}{mL}

and its molecular weight is

6 \times 10^{3} \frac{g}{mol}

. Average volume occupied by its single molecule will be:

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Beta Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-2>Q 21

For an infinitely dilute aqueous solution molality will be equal to: