Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 108

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A hydrocarbon contains $75 %$ of carbon. Then its molecular formula is

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Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 109

What is the molecular formula of a compound with empirical formula

{CH}_{2} O

and molecular mass

120 u

?

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 110

The number of atoms of

Cr

and

O

in a compound are

4.8 \times 10^{10} & 9.6 \times 10^{10}

, respectively. Its empirical formula is

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 111

The percentages of

C, H

and

N

in an organic compound are

40 %, 13.3 %

and

46.7 %

. The empirical formula of this compound is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 112

The simplest formula of a compound containing

50 %

of element

A

(Atomic weight

= 10

) and

50 %

of element

B

(Atomic weight

= 20

) is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 113

Insulin contains

3.4 %

sulphur

(S)

. The minimum mol. wt. of insulin is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 114

X g

of

Ag

was dissolved in

{HNO}_{3}

and the solution was treated with an excess of

NaCl

. Then,

2.87 g

of

AgCl

was precipitated. The value of

X

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 115

When

100 g

of ethylene polymerises entirely to polyethene, the weight of polyethene formed as per the equation

n (C_{2} H_{4}) \to {(- {CH}_{2} - {CH}_{2} -)}_{n}

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 116

10 g

of a sample of a mixture of

{CaCl}_{2}

and

NaCl

is treated to precipitate all the calcium as

{CaCO}_{3}

. This

{CaCO}_{3}

is heated to convert all the

Ca

to

CaO

and the final mass of

CaO

is

1.62 g

. The percent by mass of

{CaCl}_{2}

in the original mixture is.