In the following table the mass number and the atomic number of certain elements are given: Element A B C D E Mass number 1 7 14 40 40 Atomic number 1 3 7 18 20 (A) State the pair of isobars from the above table. (B) What would be the valency of the element C listed in the above table? (C) Which two subatomic particles are equal in number in a neutral atom?

(A) Atoms of different elements having the same mass number but different atomic number is called as isobar. In given table, element D and E is having same mass number and different atomic number. Hence, D and E are isobars. (B) The element C in given table have atomic number 7 . So, electronic configuration of element C is 1 s 2 2 s 2 2 p 3 . Hence, number of electrons in valence shell is 3 and valency of element C is 3 . (C) Proton and electron are the two subatomic particles that are equal in number in a neutral atom.

E M B I B E

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4

Priyanka B Solutions for Chapter: Sample Paper, Exercise 1: Sample Paper 4

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Priyanka B Chemistry Solutions for Exercise - Priyanka B Solutions for Chapter: Sample Paper, Exercise 1: Sample Paper 4

Attempt the practice questions on Chapter 6: Sample Paper, Exercise 1: Sample Paper 4 with hints and solutions to strengthen your understanding. Essentials of Chemistry solutions are prepared by Experienced Embibe Experts.

Questions from Priyanka B Solutions for Chapter: Sample Paper, Exercise 1: Sample Paper 4 with Hints & Solutions

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 6

A mixture containing two liquids visibly separated is placed in a separating funnel. Answer the following:

(i) What type of liquids form the mixture?

(ii) Which of the liquid will form lower layer?

(iii) What is the principle behind this method of separation?

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 7

A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following figures would correctly represent the result? Justify your choice.

Question Image

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 8

In the following table the mass number and the atomic number of certain elements are given:

Element	A	B	C	D	E
Mass number	$1$	$7$	$14$	$40$	$40$
Atomic number	$1$	$3$	$7$	$18$	$20$

(A) State the pair of isobars from the above table.

(B) What would be the valency of the element C listed in the above table?

(C) Which two subatomic particles are equal in number in a neutral atom?

EASY

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 9

In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called the law of conservation of _____.

EASY

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 9

A group of atoms carrying a fixed charge on them is called _____.

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 9

The formula unit mass of ${Ca}_{3} ({PO}_{4})_{2}$ is _____.

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 10

The following substances are added to water kept in a beaker:

(i) Sugar (ii) Milk (iii) Sand

Observe the mixtures created for stability (setting down of particles) and filterability.

MEDIUM

9th CBSE

IMPORTANT

Essentials of Chemistry>Chapter 9 - Sample Paper>Sample Paper 4>Q 11

How will you prepare (i) a mixture and (ii) a compound, using iron filings and sulphur. Can you just by seeing, judge that the mixture formed is a homogeneous and heterogeneous mixture?

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