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Syror, Baser och Salter Klass 7 Vetenskap NCERT

Syror, Baser och Salter Klass 7 Vetenskap NCERT

Barcha darajalar • 5 Ma'ruzalar • Umrbod kirish
Prabh Kirpa Classes
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Syror, Baser och Salter Klass 7 Vetenskap NCERT
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Q. 1. Ange skillnader mellan syror och baser.
Q.2. Ammoniak finns i många hushållsprodukter, såsom fönsterrengöringsmedel. Det blir blått litmusrött. Vad är dess natur?
Q.4. Är destillerat vatten surt/basiskt/neutralt? Hur skulle du verifiera det?
Q.5 Beskriv neutralisationsprocessen med hjälp av ett exempel.

Kurs mazmuni

5 bo'limlar • 5 ma'ruzalar • 00:35:28 umumiy uzunligi

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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Talablar

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Class 7 Science

Ushbu kurs haqida

Q. 1. Ange skillnader mellan syror och baser.

Q.2. Ammoniak finns i många hushållsprodukter, som fönsterrengöringsmedel. Det blir blått litmusrött. Vad är dess natur?

Q.3. Namnet på källan från vilken litmuslösningen erhålls. Vad är användningen av denna lösning?

Q.4. Är destillerat vatten surt/basiskt/neutralt? Hur skulle du verifiera det?

Q.5 Beskriv neutralisationsprocessen med hjälp av ett exempel.

  • Markera 'S' om påståendet är sant och 'F' om det är falskt:

    • (i) Salpetersyra gör rött litmus blått. (S/F)

    (ii) Natriumhydroxid gör blått litmus rött. (S/F)

    (iii) Natriumhydroxid och saltsyra neutraliserar varandra och bildar salt och vatten. (S/F)

    (iv) Indikator är ett ämne som visar olika färger i sura och basiska lösningar. (S/F)

    (v) Tandförfall orsakas av närvaron av en bas. (S/F)

    Q.7. Dorji har några flaskor läsk i sitt restaurang. Men, tyvärr, dessa är inte märkta. Han måste servera dryckerna på kundens begäran. En kund vill ha en sur dryck, en annan vill ha en basisk och den tredje vill ha en neutral dryck. Hur kommer Dorji att bestämma vilken dryck som ska serveras till vem?

    Q.8. Förklara varför:

    (a) En mjällpiller tas när du lider av surhet.

    (b) Calamine-lösning appliceras på huden när en myra biter.

    (c) Fabriksavfall neutraliseras innan det kastas ut i vattenkroppar.

    Q. 9. Tre vätskor ges till dig. En är saltsyra, en annan är natriumhydroxid och den tredje är en sockerlök. Hur kommer du att identifiera dem? Du har bara en gurkmejaindikator.

    Q. 10. Blått litmuspapper doppas i en lösning. Det förblir blått. Vad är lösningens natur? Förklara.

    Q.11. Tänk på följande påståenden:

    (a) Både syror och baser förändrar färgen på alla indikatorer.

    (b) Om en indikator ger en färgförändring med en syra, ger den inte en förändring med en bas.

    (c) Om en indikator förändrar färg med en bas, förändrar den inte färg med en syra.

    (d) Färgförändring i en syra och en bas beror på indikatorens typ.

    Vilka av dessa påståenden är korrekta?

    (i) Alla fyra (ii) a och d (iii) b, c och d (iv) endast d

    Q.8. Förklara varför:

    (a) En mjällpiller

    (b) Calamine-lösning appliceras på huden när en myra biter.

    (c) Fabriksavfall neutraliseras innan det kastas ut i

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