Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 17

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Earn 100

The percentage of oxygen in $NaOH$ is _________

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 18

Which of the following indicates natural abundance of

neon - 20

isotope?

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 19

The amount of phosphorus present in $1.375 g$ of ${PCl}_{3}$ is

(Atomic weight of $P = 31$ , $Cl = 35.5$ )

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 20

How many moles of magnesium phosphate

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

will contain

0.25

mole of oxygen atoms?

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 21

What is the ratio of the number of oxygen atoms in

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

and

H_{3} {PO}_{3}

, if both contain the same number of

P

atoms?

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 22

Cystine has a sulphur content of

26.7 %

. If its molecule contains two atoms of sulphur, what is its molecular weight?

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 23

Percentage of

Se

in peroxidase anhydrous enzyme is

0.5 %

by weight (at. wt.

= 78.4

), then minimum molecular weight of peroxidase anhydrous enzyme is:

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 24

The hydrated salt

{Na}_{2} {SO}_{4} \cdot {nH}_{2} O

loses all water of crystallization on heating and is reduced to

44.1 %

of its original weight. Therefore, the value of n is

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 25

The sodium salt of methyl orange has

7 %

sodium. What is the minimum molecular weight of the compound?