acid base and salt class 10 board question cbse
Answers
1. Define olfactory indicators. Name two subtances which can be used as olfactory indicator.
(b) Choose strong acids from the following:
CH3COOH, H2SO4, H2CO3, HNO3
2.Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity illustrate how these are inter convertible.
(b) Write chemical names and formula of plaster of paris and gypsum.
3.(a) State the chemical properties on which the following uses of baking soda are based:
(i) as an antacid
(ii) as a soda acid fire extiguisher
(iii) to make bread and cake soft and spongy.
4.How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?
5.A white powder is added while baking breads and cakes to make them soft and fluffy. Write the name of the powder. Name its main ingredients. Explain the function of each ingredient. Write the chemical reaction taking place when the powder is heated during baking.
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कवि: अयोध्यासिंह उपाध्याय ‘हरिऔध’
क) देखकर बाधा विविध, ………………………………. वे कर जिसे सकते नहीं |
१) प्रस्तुत पद्यखंड में कवि ने किसकी प्रशंसा की है ? कवि का परिचय दीजिये |
उत्तर: कवि अयोध्यासिंह उपाध्याय ‘हरिऔध’ जी आधुनिक युग के मूर्धन्य कवि हैं | इनके प्रमुख ग्रन्थ हैं ‘प्रियप्रवास’, ‘वैदेही वनवास’, और ‘रसकलश’ | ‘हरिऔध’ जी का ब्रजभाषा और खड़ी बोली पर समान अधिकार रहा है | उन्होंने कई उपन्यास तथा नाटक भी लिखे हैं | प्रस्तुत पद्य खंड में कवि कर्मवीरों की प्रशंसा कर रहे हैं |
२) कर्मवीर को पछतावा क्यों नहीं होता ?