Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 4

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IMPORTANT

Earn 100

$500 cc$ of a hydrocarbon gas burnt in excess of oxygen yielded $2500 cc$ of ${CO}_{2}$ and $3$ litres of $H_{2} O$ vapour, measured under identical conditions of temperature and pressure. The formula of the hydrocarbon 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 5

How many moles of electrons weigh one kilogram?

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 6

In which of the following pairs do $1 g$ of each have an equal number of molecules?

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 1>Q 7

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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IMPORTANT

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

4 g

of hydrogen is ignited with

4 g

of oxygen, the amount of water formed is?

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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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IMPORTANT

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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IMPORTANT

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}

.

EASY

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IMPORTANT

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 $Fe$ .