Question

12 If three resistors of 60, 90 and 210 are connected in series to a 12V battery, find a) The total
resistance of the circuit. b) The current flowing through the circuit.
13. A gas X reacts with lime water and forms a compound Y which is used as bleaching agent in the
chemical industry. Identify X and Y. Give the chemical equation of the reaction involved.
14. Show the formation of magnesium chloride with the help of electron dot structure,
15. Write the function of the following: a) Bile b) Hydrochloric acid
16. Name the type of mirror used in the following situations: a) Headlights of car b) Rear-view mirror
of vehicles.​

Answer 1

Answer:

I have now only first questions answer

Answer 2

Q .13 )

A gas X reacts with lime water and forms a compound Y which is used as bleaching agent in the chemical industry. Y =》Ca(OH)2. 2Ca(OH)2 + 2Cl2 ——> Ca(OCl)2 + CaCl2 + 2H2O.

Q.14 )

Mg atom has 2 valence electrons. It loses these 2 valence electrons to form Mg 2+ ion. Cl atom has 7 valence electrons. It gains one valence electron to form Cl − ion.

Bro structure is in attachment

Q.15 )

Bile juice helps in digestion and absorption of fats. Hydochloric acid protects the stomach from bacteria. Villi increases the surface area and helps in absorption of food in small intestine.

Q.16 )

• (a) A convex mirror is used as side rear view mirror, because its field of view is larger and it forms virtual, erect and diminished images of objects behind.
• (b) For solar furnace, we use a concave mirror. Light from the sun, on reflection from the mirror, is concentrated at the focus of the mirror, producing heat.

Note :–

• Answer 12 is in attachment