1. Define Alcohols.
2. What do you understand by exothermic reactions? Write one example.
3. Enlist two uses of bleaching powder.
4. What are Döbereiner's Triads? What are their basis? Give three examples.
Or
What happens to the Metallic and Non Metallic character of the elements
we move in a group and period? Why does it change in this way?
Section-C [Life Science ]
5. The xylem in plants are responsible for :
(A) transport of water
(B) transport of food
(C) transport of amino acids
(D) transport of oxyger
Answers
Answer:
1 a colourless volatile flammable liquid which is produced by the natural fermentation of sugars and is the intoxicating constituent of wine, beer, spirits, and other drinks, and is also used as an industrial solvent and as fuel.
1) DEFINE ALCOHOL :
In chemistry, alcohol is an organic compound that carries at least one hydroxyl functional group (−OH) bound to a saturated carbon atom. The term alcohol originally referred to the primary alcohol ethanol (ethyl alcohol), which is used as a drug and is the main alcohol present in alcoholic drinks.
2) ANSWER :
The reaction which is accompanied with evolution of heat is known as exothermic reaction. CaO + CO2 → CaCO3, ΔH= -178.3 kJ mol-1
3)USES :
used to produce white cloth, to prepare fabrics for other finishes, or to remove discoloration that has occurred in other processes.
used to whiten or remove the natural colour of fibres, yarns, other textiles, and paper.
4)The elements lithium, sodium and potassium form a Dobereiner's triad. Lithium is the first element of this triad, sodium is the middle element whereas potassium is the third element of the triad.
5)Note that there is no clear division between metallic and non-metallic character. As we move across the periodic table, there is an increasing tendency to accept electrons (non-metallic) and a decrease in the possibility that an atom would give up one or more electrons.
BAAP RE BAAP ITNI CHEMISTRY. SORRY M BUS ITNA. HI ANSWER KR PAI