Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 7

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IMPORTANT

Earn 100

Density of ozone relative to methane under the same temperature and pressure conditions is:

37.5% studentsanswered this correctly

Important Questions on Mole Concept - 1

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 8

Vapour density of a gas if its density is

0.178 g / L

at

NTP

is:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 9

A nugget of gold and quartz was found to contain

' x' g

of gold and

' y' g

of quartz and has density

d

. If the densities of gold and quartz are

d_{1}

and

d_{2}

, respectively then the correct relation is:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 10

The atomic weights of two elements

A

and

B

are

40

and

80

, respectively. If

' x' g

of

A

contains

y

atoms, how many atoms are present in

' 2 x' g

of

B

?

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KVPY Aptitude Test - Stream SA

IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 11

The empirical formula of a compound of molecular mass

120

is

{CH}_{2} O

. The molecular formula of the compound is:

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 12

Calculate the molecular formula of compound which contains

20 % Ca

and

80 % Br

(by weight), if molecular weight of compound is

200

. (atomic weight of

Ca = 40, Br = 80

)

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 13

What weight of ${CaCO}_{3}$ must be decomposed to produce the sufficient quantity of carbon dioxide to convert $21.2 kg$ of ${Na}_{2} {CO}_{3}$ completely into ${NaHCO}_{3}$ . $[$ Atomic mass $Na = 23, Ca = 40]$
${CaCO}_{3} ⟶ CaO + {CO}_{2}$

${Na}_{2} {CO}_{3} + {CO}_{2} + H_{2} O ⟶ 2 {NaHCO}_{3}$

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 14

12 g

of alkaline earth metal gives

14.8 g

of its nitride. Atomic weight of metal is -

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 1 - Mole Concept - 1>EXERCISE>Q 15

Calculate the amount of

Ni

needed in the Mond's process given below.

Ni + 4 CO ⟶ Ni (CO)_{4}

If,

CO

used in this process is obtained through a process, in which

6 g

of carbon is mixed with

44 g {CO}_{2}

.