urgently solve my exam

urgently solve my exam Class: X 13:21 NCERT SCI... EX.AM 69% Tme: 1 hour Answer the folbwlng qtBtJons (Q I to 4b!n short (VSA OWA). Each I Wks. 1. people "efer to drink chilled aerated drinks TN' a gas in it. whkh actually reacts with water to form weak acid. Identify the type of reaction and write the balanced chernical equation. 2. 'A' to stir a solution of nitrate, whik smn to stfr a solupion of nitrate. What will be the most ideal to follow according to you? 3. A a roof of houæ using sheets, Electroplating is a in which protective laver of other metal Is applied on iron sheet to prevent frm gettitg Of are to fM the sheets. mwth by net— system in this. Each question carries 2 uarks. S. An current Of 5 A. 6. What will happen if we kill atl the crganisrns in one 7. of ±pletion Of effects Of this layer. SECTION. C the folbwing questions (Q 8 to 12) brief (Ma ire crackers upon bursting produce har I Whichpollutes environmentto Greater exteN. R is to as min (a) Explain the pollution caused by writing balanced chemical equations, (b) On nature and of chemical eqntions invotRd in it. 9. Sodium is presmt in common salt, Which is used every day in food. Iron is central metal ion pr&nt in hemoglobin and Gold is used to make ornarnents. (a) What to these metals in state when they are exposed to atmosphere (atmosphere contains air and humidity), Explain by showing necessary chernical (b) in 9. (a) Show the formation ofNaCl from sodium and chlorine atoms by the transfer of electro'". (b) Which compounds are usually hard and Why? (c) Why are ttEtaIs cxmductors Of el«triCitYl 10, Draw structure ot neuron & explain its 'unction. Explain motor With proper diagram.

Dear student,
8)
Fire crackers upon bursting produce harmful gases which pollutes environment.
It is found to contain sulphur as main ingredient.
a) The presence of sulphur in the crackers gives them the distinct colour and effect, and these sulphur are so toxic in nature that they are hazardous to human health. When crackers are used, they release high amount of these sulphur in the atmosphere causing pollution. Inhaling this air is harmful for humans.
Chemical reaction
S + O₂--------------------> SO₂
b)
The type of reaction is combination reaction .
It can also be said to be a combustion reaction as it is a redox reaction with a flame.
Regards

View Full Answer