- Mark ‘T’ if the statement is true and ‘F’ if it is false:
Ácidos, Bases e Sais Classe 7 Ciência NCERT
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মোট বিষয়বস্তুযা শিখবেন
Q. 1. Afirme as diferenças entre ácidos e bases.
Q.2. A amônia é encontrada em muitos produtos domésticos, como limpadores de janelas. Ela transforma o litmus vermelho em azul. Qual é a sua natureza?
Q.4. A água destilada é ácida/básica/neutra? Como você verificaria isso?
Q.5 Descreva o processo de neutralização com a ajuda de um exemplo.
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. Afirme as diferenças entre ácidos e bases.
Q.2. A amônia é encontrada em muitos produtos domésticos, como limpadores de janelas. Ela transforma o litmus vermelho em azul. Qual é a sua natureza?
Q.3. Nomeie a fonte da qual a solução de litmus é obtida. Qual é o uso desta solução?
Q.4. A água destilada é ácida/básica/neutra? Como você verificaria isso?
Q.5 Descreva o processo de neutralização com a ajuda de um exemplo.
(i) O ácido nítrico transforma o litmus vermelho em azul. (V/F)
(ii) O hidróxido de sódio transforma o litmus azul em vermelho. (V/F)
(iii) O hidróxido de sódio e o ácido clorídrico se neutralizam e formam sal e água. (V/F)
(iv) O indicador é uma substância que mostra cores diferentes em soluções ácidas e básicas. (V/F)
(v) A cárie dentária é causada pela presença de uma base. (V/F)
Q.7. Dorji tem algumas garrafas de refrigerantes em seu restaurante. Mas, infelizmente, estas não estão rotuladas. Ele tem que servir as bebidas conforme a demanda dos clientes. Um cliente quer uma bebida ácida, outro quer uma básica e o terceiro quer uma bebida neutra. Como Dorji decidirá qual bebida deve ser servida a quem?
Q.8. Explique por que:
(a) Um comprimido antiácido é tomado quando você sofre de acidez.
(b) A solução de calamina é aplicada na pele quando uma formiga pica.
(c) O resíduo de fábrica é neutralizado antes de ser descartado nos corpos d'água.
Q. 9. Três líquidos são dados a você. Um é ácido clorídrico, outro é hidróxido de sódio e o terceiro é uma solução de açúcar. Como você os identificaria? Você tem apenas um indicador de cúrcuma.
Q. 10. O papel de litmus azul é mergulhado em uma solução. Ele permanece azul. Qual é a natureza da solução? Explique.
Q.11. Considere as seguintes afirmações:
(a) Tanto os ácidos quanto as bases mudam a cor de todos os indicadores.
(b) Se um indicador muda de cor com um ácido, não muda com uma base.
(c) Se um indicador muda de cor com uma base, não muda de cor com um ácido.
(d) A mudança de cor em um ácido e uma base depende do tipo de indicador.
Quais dessas afirmações estão corretas?
(i) Todas as quatro (ii) a e d (iii) b, c e d (iv) apenas d
Q.8. Explique por que:
(a) Um comprimido antiácido
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