EASY

JEE Main

IMPORTANT

Earn 100

The number of atoms in $8 g$ of sodium is $x \times 10^{23} .$ The value of $x$ is _____ . (Nearest integer)

$[Given : N_{A} = 6.02 \times 10^{23} {mol}^{- 1} Atomic mass of Na = 23.0 u]$

78.95% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 24 June 2022 Shift 1>Q 77

If a rocket runs on a fuel

(C_{15} H_{30})

and liquid oxygen, the weight of oxygen required and

{CO}_{2}

released for every litre of fuel respectively are :
(Given : density of the fuel is

0.756 g / mL

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 25 June 2022 Shift 1>Q 78

The number of

N

atoms in

681 g

C_{7} H_{5} N_{3} O_{6}

x \times 10^{21}

. The value of

x

(N_{A} = 6.02 \times 10^{23} {mol}^{- 1})

(Nearest Integer)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 25 June 2022 Shift 1>Q 79

Number of grams of bromine that will completely react with

5.0 g

of pent-

1

-ene is____

\times 10^{- 2} g

. (Atomic mass of

Br = 80 g / mol

) [Nearest integer]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 25 June 2022 Shift 2>Q 80

A protein '

A

' contains

0.30 %

of glycine (molecular weight

75

). The minimum molar mass of the protein '

A

' is____

\times 10^{3} g {mol}^{- 1}

[nearest integer]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 26 June 2022 Shift 2>Q 81

CNG

is an important transportation fuel. When

100 gCNG

is mixed with

208 g

oxygen in vehicles, it leads to the formation of

{CO}_{2}

and

H_{2} O

and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced in grams is [nearest integer] [Assume CNG to be methane]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 26 June 2022 Shift 2>Q 82

The moles of methane required to produce

81 g

of water after complete combustion is____

\times 10^{- 2} mol

. [nearest integer]

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 26 June 2022 Shift 1>Q 83

A commercially sold conc.

HCl

35 % HCl

by mass. If the density of this commercial acid is

1.46 g / mL

, the molarity of this solution is : (Atomic mass :

Cl = 35.5 amu, H = 1 amu

)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 26 June 2022 Shift 1>Q 84

On complete combustion

0.30 g

of an organic compound gave

0.20 g

of carbon dioxide and

0.10 g

of water. The percentage of carbon in the given organic compound is____(Nearest Integer)

The number of atoms in 8 g of sodium is x×1023. The value of x is _____ . (Nearest integer) Given : NA=6.02×1023 mol-1 Atomic mass of Na=23.0u]

Important Questions on Some Basic Concepts of Chemistry

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The number of atoms in $8 g$ of sodium is $x \times 10^{23} .$ The value of $x$ is _____ . (Nearest integer)

$[Given : N_{A} = 6.02 \times 10^{23} {mol}^{- 1} Atomic mass of Na = 23.0 u]$