Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12

West Bengal Board Solutions for Chapter: Atom, Molecule and Chemical Reaction, Exercise 12: Exercise 12

Author:West Bengal Board

West Bengal Board Science Solutions for Exercise - West Bengal Board Solutions for Chapter: Atom, Molecule and Chemical Reaction, Exercise 12: Exercise 12

Attempt the free practice questions on Chapter 3: Atom, Molecule and Chemical Reaction, Exercise 12: Exercise 12 with hints and solutions to strengthen your understanding. Environment and Science Class 7 solutions are prepared by Experienced Embibe Experts.

Questions from West Bengal Board Solutions for Chapter: Atom, Molecule and Chemical Reaction, Exercise 12: Exercise 12 with Hints & Solutions

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (iii)

Balance the following by putting the suitable numbers in the blank spaces:

${Na}_{2} {CO}_{3} + \dots . HCl \to \dots \dots NaCl + {CO}_{2} + H_{2} O$

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (iv)

Balance the following by putting the suitable numbers in the blank spaces:

2 Pb {({NO}_{3})}_{2} \to \dots . . PbO + \dots \dots {NO}_{2} + O_{2}

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (v)

Balance the following by putting the suitable numbers in the blank spaces:

\dots . {AgNO}_{3} + H_{2} S \to {Ag}_{2} S + \dots {HNO}_{3}

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (vi)

Balance the following by putting the suitable numbers in the blank spaces:

P_{4} +__I_{2} \to__{PI}_{3}

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (vii)

Balance the following by putting the suitable numbers in the blank spaces:

{CH}_{4} + \dots . O_{2} \to {CO}_{2} + \dots . . H_{2} O

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (viii)

Balance the following by putting the suitable numbers in the blank spaces:

\dots . {KClO}_{3} \to \dots . KCl + \dots . O_{2}

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (ix)

Balance the following by putting the suitable numbers in the blank spaces:

\dots . . KI + {Cl}_{2} \to \dots \dots KCl + I_{2}

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 3 - Atom, Molecule and Chemical Reaction>Exercise 12>Q (x)

Balance the following by putting the suitable numbers in the blank spaces:

\dots . NaOH + H_{2} {SO}_{4} \to {Na}_{2} {SO}_{4} + \dots H_{2} O