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酸、塩基、塩 クラス7 科学 NCERT

酸、塩基、塩 クラス7 科学 NCERT

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酸、塩基、塩 クラス7 科学 NCERT
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Q. 1. 酸と塩基の違いを述べてください。
Q.2. アンモニアは多くの家庭用製品、例えば窓の洗剤に含まれています。それは赤色リトマス紙を青色に変えます。その性質は何ですか?
Q.4. 蒸留水は酸性/塩基性/中性ですか?どのように確認しますか?
Q.5 中和のプロセスを例を用いて説明してください。

Maudhui ya Kozi

5 sehemu • 5 mihadhara • 00:35:28 urefu wa jumla

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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Class 7 Science

Kuhusu kozi hii

Q. 1. 酸と塩基の違いを述べてください。

Q.2. アンモニアは多くの家庭用製品、例えば窓の洗剤に含まれています。それは赤色リトマス紙を青色に変えます。その性質は何ですか?

Q.3. リトマス溶液の源は何ですか?この溶液の用途は何ですか?

Q.4. 蒸留水は酸性/塩基性/中性ですか?どのように確認しますか?

Q.5 中和のプロセスを例を用いて説明してください。

  • 次の文が真なら「T」を、偽なら「F」を記入してください:
  • (i) 硝酸は赤色リトマス紙を青色に変えます。 (T/F)

    (ii) 水酸化ナトリウムは青色リトマス紙を赤色に変えます。 (T/F)

    (iii) 水酸化ナトリウムと塩酸は互いに中和し、塩と水を形成します。 (T/F)

    (iv) 指示薬は酸性と塩基性の溶液で異なる色を示す物質です。 (T/F)

    (v) 虫歯は塩基の存在によって引き起こされます。 (T/F)

    Q.7. ドルジにはレストランでいくつかのソフトドリンクのボトルがありますが、不幸にもこれらはラベルがついていません。彼は顧客の要求に応じて飲み物を出す必要があります。ある客は酸性の飲み物を、別の客は塩基性の飲み物を、そして第三の客は中性の飲み物を求めています。ドルジはどのようにしてどの飲み物を誰に出すかを決定するのでしょうか?

    Q.8. なぜか説明してください:

    (a) 胃酸過多の時に制酸剤を服用する。

    (b) アリに刺された時にカレーミン溶液を皮膚に塗る。

    (c) 工場廃棄物を水域に排出する前に中和する。

    Q. 9. 3つの液体が与えられています。1つは塩酸、もう1つは水酸化ナトリウム、そして3つ目は砂糖溶液です。ターメリック指示薬のみを使用してこれらをどのように識別しますか?

    Q. 10. 青色リトマス紙を溶液に浸します。それは青色のままです。その溶液の性質は何ですか?説明してください。

    Q.11. 次の文を考えてみてください:

    (a) 酸と塩基はすべての指示薬の色を変えます。

    (b) 指示薬が酸で色を変える場合、塩基では変化しません。

    (c) 指示薬が塩基で色を変える場合、酸では変化しません。

    (d) 酸と塩基での色の変化は指示薬の種類に依存します。

    これらの文のどれが正しいですか?

    (i) すべて (ii) aとd (iii) b、c、d (iv) dのみ

    Q.8. なぜか説明してください:

    (a) 胃酸過多の時に制酸剤を服用する。

    (b) アリに刺された時にカレーミン溶液を皮膚に塗る。

    (c) 工場廃棄物を中和してから水域に排出する。

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