- Mark ‘T’ if the statement is true and ‘F’ if it is false:
Acizi, Baze și Săruri Clasa 7 Știință NCERT
Acizi, Baze și Săruri Clasa 7 Știință NCERT
সকল স্তর • 5 বক্তৃতা • আজীবন অ্যাক্সেস
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Q. 1. Statuiți diferențele dintre acizi și baze.
Q.2. Amoniacul se găsește în multe produse casnice, cum ar fi curățătorii de geamuri. Se întoarce litmusul roșu în albastru. Care este natura sa?
Q.4. Este apa distilată acidă/bazică/neutră? Cum o veți verifica?
Q.5 Descrieți procesul de neutralizare cu ajutorul unui exemplu.
কোর্সের বিষয়বস্তু
5 বিভাগ • 5 বক্তৃতা • 00:35:28 মোট দৈর্ঘ্যDifferences 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.
- Mark ‘T’ if the statement is true and ‘F’ if it is false:
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এই কোর্স সম্পর্কে
Q. 1. Statuiți diferențele dintre acizi și baze.
Q.2. Amoniacul se găsește în multe produse casnice, cum ar fi curățătorii de geamuri. Se întoarce litmusul roșu în albastru. Care este natura sa?
Q.3. Numiți sursa din care se obține soluția de litmus. Care este folosirea acestei soluții?
Q.4. Este apa distilată acidă/bazică/neutră? Cum o veți verifica?
Q.5 Descrieți procesul de neutralizare cu ajutorul unui exemplu.
(i) Acidul nitric întoarce litmusul roșu în albastru. (V/F)
(ii) Hidroxidul de sodiu întoarce litmusul albastru în roșu. (V/F)
(iii) Hidroxidul de sodiu și acidul clorhidric se neutralizează reciproc și formează sare și apă. (V/F)
(iv) Indicatorul este o substanță care arată culori diferite în soluții acide și bazice. (V/F)
(v) Decazul dinților este cauzat de prezența unei baze. (V/F)
Q.7. Dorji are câteva sticle de băuturi răcoritoare în restaurantul său. Dar, din păcate, acestea nu sunt etichetate. Trebuie să servească băuturile la cererea clienților. Un client dorește o băutură acidă, altul una bazică și al treilea vrea o băutură neutră. Cum va decide Dorji care băutură trebuie servită cui?
Q.8. Explicați de ce:
(a) O tabletă antiacidă este luată atunci când suferiți de aciditate.
(b) Soluția de calamină se aplică pe piele atunci când o furnică mușcă.
(c) Deșeurile din fabrică sunt neutralizate înainte de a fi aruncate în corpurile de apă.
Q. 9. Vă sunt date trei lichide. Unul este acid clorhidric, altul este hidroxid de sodiu și al treilea este o soluție de zahăr. Cum le veți identifica? Aveți doar un indicator de curcuma.
Q. 10. Hârtia de litmus albastră este scufundată într-o soluție. Rămâne albastră. Care este natura soluției? Explicați.
Q.11. Luați în considerare următoarele afirmații:
(a) Atât acizii, cât și bazele schimbă culoarea tuturor indicatorilor.
(b) Dacă un indicator dă o schimbare de culoare cu un acid, nu dă o schimbare cu o bază.
(c) Dacă un indicator schimbă culoarea cu o bază, nu schimbă culoarea cu un acid.
(d) Schimbarea culorii într-un acid și o bază depinde de tipul indicatorului.
Care dintre aceste afirmații sunt corecte?
(i) Toate patru (ii) a și d (iii) b, c și d (iv) doar d
Q.8. Explicați de ce:
(a) O tabletă antiacidă
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