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Acids, Bases and Salts Class 7 Science NCERT

Кислоты, щелочи и соли. Класс 7. Наука. NCERT

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Prabh Kirpa Classes
Prabh Kirpa Classes

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Кислоты, щелочи и соли. Класс 7. Наука. NCERT
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What you will learn

Вопрос 1. Укажите различия между кислотами и щелочами?
Вопрос 2. Аммиак встречается во многих бытовых продуктах, таких как средства для очистки стекол. Он обращает красный лакмус в синий. Какова его природа?
Вопрос 4. Является ли дистиллированная вода кислой/основной/нейтральной? Как бы вы это проверили?
Вопрос 5. Опишите процесс нейтрализации с помощью примера.

Course Content

5 sections • 5 lectures • 00:35:28 total length

A Introduction

03:25
Q. 1. State differences between acids and bases. Q.2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? Q.3. Name the source from which litmus solution is obtained. What is the use of this solution? Q.4. Is the distilled water acidic/basic/neutral? How would you verify it? Q.5 Describe the process of neutralisation with the help of an example.
  1. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F) (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F) (v) Tooth decay is caused by the presence of a base. (T/F) Q.7.Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom? Q.8. Explain why: (a) An antacid tablet is taken when you suffer from acidity. (b) Calamine solution is applied on the skin when an ant bites. (c) Factory waste is neutralised before disposing it into the water bodies. Q. 9. Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator. Q. 10. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain. Q.11. Consider the following statements: (a) Both acids and bases change colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct? (i) All four (ii) a and d (iii) b, c and d (iv) only d

Differences between acids and bases, Nature of ammonia & distilled water, litmus

08:26

Q. 1. State differences between acids and bases.
Q.2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Q.3. Name the source from which litmus solution is obtained.What is the use of this solution?
Q.4. Is the distilled water acidic/basic/neutral? How would you verify it?

Process of neutralisation with example and some true false questions

06:22
Q.5 Describe the process of neutralisation with the help of an example.
  1. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(i) Nitric acid turn red litmus blue. (T/F) (ii) Sodium hydroxide turns blue litmus red. (T/F) (iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F) (iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F) (v) Tooth decay is caused by the presence of a base. (T/F)
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Requirements

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Target Audience

Class 7 Science

About this course

Вопрос 1. Укажите различия между кислотами и щелочами.

Вопрос 2. Аммиак встречается во многих бытовых продуктах, таких как средства для очистки стекол. Он обращает красный лакмус в синий. Какова его природа?

Вопрос 3. Назовите источник, из которого получают раствор лакмуса. Каково применение этого раствора?

Вопрос 4. Является ли дистиллированная вода кислой/основной/нейтральной? Как бы вы это проверили?

Вопрос 5. Опишите процесс нейтрализации с помощью примера.

  • Поставьте 'В', если утверждение верно, и 'Н', если оно неверно:

    • (i) Азотная кислота обращает красный лакмус в синий. (В/Н)

    (ii) Гидроксид натрия обращает синий лакмус в красный. (В/Н)

    (iii) Гидроксид натрия и соляная кислота нейтрализуют друг друга и образуют соль и воду. (В/Н)

    (iv) Индикатор - это вещество, которое показывает различные цвета в кислых и основных растворах. (В/Н)

    (v) Карие зуба вызывается наличием основания. (В/Н)

    Вопрос 7. У Доржи в его ресторане несколько бутылок безалкогольных напитков, но, к сожалению, они не маркированы. Ему приходится подавать напитки по требованию клиентов. Один клиент хочет кислый напиток, другой - основной, а третий - нейтральный. Как Доржи решит, какой напиток подавать кому?

    Вопрос 8. Объясните почему:

    (а) При кислоте принимают таблетки антацидов.

    (б) На кожу наносят раствор каламина при укусе муравья.

    (в) Фабричные отходы нейтрализуют перед сбросом в водоемы.

    Вопрос 9. Вам даны три жидкости. Одна - соляная кислота, другая - гидроксид натрия, а третья - раствор сахара. Как вы их определите? У вас есть только куркума-индикатор.

    Вопрос 10. Синий листок лакмусовой бумаги опускают в раствор. Он остается синим. Какова природа раствора? Объясните.

    Вопрос 11. Рассмотрите следующие утверждения:

    (а) Как кислоты, так и щелочи изменяют цвет всех индикаторов.

    (б) Если индикатор дает изменение цвета с кислотой, то он не дает изменения с щелочью.

    (в) Если индикатор меняет цвет с щелочью, то он не меняет цвет с кислотой.

    (г) Изменение цвета в кислоте и щелочи зависит от типа индикатора.

    Какие из этих утверждений верны?

    (i) Все четыре (ii) а и д (iii) б, в и д (iv) только д

    Вопрос 8. Объясните почему:

    (а) При кислоте принимают таблетки антацидов.

    (б) На кожу наносят раствор каламина при укусе муравья.

    (в) Фабричные отходы нейтрализуют перед сбросом в водоемы.

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    This channel is purely education based. Our aim is to ensure that the students are able to understand each and every question in an easy way. We take pride in providing quality educational services to the students of Class VII to Class XI Science NCERT, English, Computer solutions, Mathematics, Business Studies & Economics. Our goal is to help the leaders of tomorrow to learn to succeed today....

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