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Acidi, Basi e Sali Classe 7 Scienze NCERT

Acidi, Basi e Sali Classe 7 Scienze NCERT

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Acidi, Basi e Sali Classe 7 Scienze NCERT
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আপনার প্রশিক্ষকের সাথে দেখা করুন: Prabh Kirpa Classes

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35 মি.
মোট বিষয়বস্তু

যা শিখবেন

Q. 1. Dichiara le differenze tra acidi e basi.
Q.2. L'ammoniaca si trova in molti prodotti domestici, come i detergenti per finestre. Fa virare il litmus rosso in blu. Qual è la sua natura?
Q.4. L'acqua distillata è acida/basica/neutra? Come la verificheresti?
Q.5 Descrivi il processo di neutralizzazione con l'aiuto di un esempio.

কোর্সের বিষয়বস্তু

5 বিভাগ • 5 বক্তৃতা • 00:35:28 মোট দৈর্ঘ্য

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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প্রয়োজনীয়তা

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লক্ষ্য শ্রোতা

Class 7 Science

এই কোর্স সম্পর্কে

Q. 1. Dichiara le differenze tra acidi e basi.

Q.2. L'ammoniaca si trova in molti prodotti domestici, come i detergenti per finestre. Fa virare il litmus rosso in blu. Qual è la sua natura?

Q.3. Nome della fonte da cui si ottiene la soluzione di litmus. Qual è l'uso di questa soluzione?

Q.4. L'acqua distillata è acida/basica/neutra? Come la verificheresti?

Q.5 Descrivi il processo di neutralizzazione con l'aiuto di un esempio.

  • Marca 'V' se l'affermazione è vera e 'F' se è falsa:
  • (i) L'acido nitrico fa virare il litmus rosso in blu. (V/F)

    (ii) Il sodio idrossido fa virare il litmus blu in rosso. (V/F)

    (iii) Il sodio idrossido e l'acido cloridrico si neutralizzano a vicenda e formano sale e acqua. (V/F)

    (iv) L'indicatore è una sostanza che mostra colori diversi in soluzioni acide e basiche. (V/F)

    (v) La carie dentaria è causata dalla presenza di una base. (V/F)

    Q.7. Dorji ha alcune bottiglie di bevande analcoliche nel suo ristorante. Purtroppo, queste non sono etichettate. Deve servire le bevande su richiesta dei clienti. Un cliente vuole una bevanda acida, un altro vuole una base e il terzo vuole una bevanda neutra. Come deciderà Dorji quale bevanda servire a chi?

    Q.8. Spiega perché:

    (a) Una compressa antiacida viene assunta quando si soffre di acidità.

    (b) La soluzione di calamina viene applicata sulla pelle quando una formica punge.

    (c) I rifiuti delle fabbriche vengono neutralizzati prima di essere scaricati nei corpi idrici.

    Q. 9. Ti vengono dati tre liquidi. Uno è acido cloridrico, un altro è sodio idrossido e il terzo è una soluzione di zucchero. Come li identificheresti? Hai solo un indicatore di curcuma.

    Q. 10. La carta di litmus blu viene immersa in una soluzione. Rimane blu. Qual è la natura della soluzione? Spiega.

    Q.11. Considera le seguenti affermazioni:

    (a) Sia gli acidi che le basi cambiano il colore di tutti gli indicatori.

    (b) Se un indicatore dà un cambiamento di colore con un acido, non dà un cambiamento con una base.

    (c) Se un indicatore cambia colore con una base, non cambia colore con un acido.

    (d) Il cambiamento di colore in un acido e una base dipende dal tipo di indicatore.

    Quali di queste affermazioni sono corrette?

    (i) Tutte e quattro (ii) a e d (iii) b, c e d (iv) solo d

    Q.8. Spiega perché:

    (a) Una compressa antiacida viene assunta quando si soffre di acidità.

    (b) La soluzione di calamina viene applicata sulla pelle quando una formica punge.

    (c) I rifiuti delle fabbriche vengono neutralizzati prima di essere scaricati nei corpi idrici.

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