Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 14

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The most abundant elements by mass in the body of a healthy human adult are:
Oxygen $(61.4 %)$ , Carbon $(22.9 %)$ , Hydrogen $(10.0 %)$ and Nitrogen $(2.6 %)$ . The weight, which a $75 kg$ person would gain if all ${}^{1}H$ atoms are replaced by ${}^{2}H$ atoms 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 15

The percentage composition of carbon in urea,

[CO ({NH}_{2})_{2}]

is _______

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Chemistry Crash Course MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Exercise 1>Q 16

What is the

%

of

H_{2} O

in

Fe (CNS)_{3} . 3 H_{2} O

? (molar mass of

Fe (CNS)_{3} . 3 H_{2} O = 284 g

)

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

The percentage of oxygen in

NaOH

is _________

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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?