Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 8

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IMPORTANT

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$4 g$ of hydrogen is ignited with $4 g$ of oxygen, the amount of water formed is?

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Important Questions on Some Basic Concepts of Chemistry

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 9

The molarity of the solution containing

2.8 %

w / v

solution of

KOH

is ?

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 10

Mole fraction of

A

in

H_{2} O

is

0.2 .

The molality of

A

in

H_{2} O

is :

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 11

112.0 mL

of

{NO}_{2}

at

STP

was liquefied, the density of the liquid being

1.15 g {mL}^{- 1}

. Calculate the volume and the number of molecules in the liquid

{NO}_{2}

.

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 12

Given that the abundance of isotopes of iron, ${}^{54}{Fe}, {}^{56}{Fe}$ and ${}^{57}{Fe}$ are $5 %, 90 %$ , and, $5 %$ respectively, then calculate the atomic mass of $Fe$ .

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 13

14 g

of an element

X

combines with

16 g

of oxygen. The element

X

could have an atomic weight of

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 14

The number of molecules of the sweetener saccharin, which can be prepared

Question Image

from

30 C - atoms, 25 H - atoms, 12 O - atoms, 8 S - atoms and 14 N - atoms

is

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 15

Haemoglobin contains

0.334 %

of

Fe

by weight. The molecular weight of haemoglobin is approximately

67200 grams

. The number of

Fe

atoms present in one molecule of haemoglobin is

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Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 16

At

100 ° C

and

1 atm,

if the density of liquid water is

1.0 g {cm}^{- 3}

and that of water vapour is

0.0006 g {cm}^{- 3}

, the volume occupied by water molecules in

1

L

of steam at that temperature is