Messages posted by annu93@rediffmail.com

laughing gas(N₂O), Carbon Monooxide(CO) are other examples.

Gold and Platinum do not, corrode easily because they are least reactive.

1. Corrosion of metals like aluminium and zinc is an advantage because they react with oxygen to form a thin layer of oxide on the surface which prevents further corrosion .

2. Corrosion of Iron is a serious problems as corroded iron loses its properties and cannot be used.Every year tons of iron has to be replaced. methods ike galvanization,painting are used to prevent rusting.

oxides of metals. K₂O, CaO etc.

Hello

I think it is not a wheat stone bridge the ratios are not equal

Respiration is considered a exothermic reaction becuase food(gulcose) is oxidised to release energy and forms CO₂ and water

40 W bulb has higher resistance by teh relation. P= V²/R. Power is inversely propotional to resistance.

Magnetic field is the area around a magnet where the force of magnet can be experienced.

Wasing soda has many industrial uses:-

1. I t used in manufacture of sodum compounds such as Borax

2. Used in Paper,glass, inudstry

3. It used to remove hardness of water.

4. It is also used a nalytical reagent

as many as you can but 15-20 should be enough.

a²=b+c-

b²=a+c

c²=a+b

Add these up

a² + b²+ c² = 2(a+b+c)

a² + b²+ c²/(a+b+c)=2

a²/(a+b+c)+b²/(a+b+c)+c²/(a+b+c)=2

a² /a(1+a)+b²/b(1+b)+c²/c(1+c)=2 ( since a+b= c²,a²=b+c,b²=a+c)

Hence proved(

have a reference book but don't forget NCERT. refrence books tell a lot of things not needed for boards but a occasional question from those may ruin your 100% dream .

Parallel coz their endpoints are the same(same p.d)

m/2{2a+(m-1)d} = n and n/2{2a+(n-1)d} = m

Subtracting these we get

2a(m-n)+d(m²-n²)-d(m-n)=2(n-m

2a+d(m+n)-d=-2 {dividing each by (m-n)

(m+n)/2{2a+d(m+n-1)}=-(m+n) (multiplying both by (m+n)

Hence proved(

Q=it

Q= 0.5*2*60*60 = 3600

Q=ne

3600= n 1.6*10^-19

n= 2.25*10²²

which has better correspondence course for 11 and 12 fiitjee or vidyamandir?

Law of Dominance- I don't know exact statement. but it tells that in heterozygous condition the dominant factor is expressed.

if you want to practice extensive questions then "Together with" would be perfect.

Method by soumik is correct. your answer should come 16.0 (approx)

you can also use soap in place of baking soda

x- Propane ( blue flame in sufficeint air )

Y- Propene ( produces sooty flame due to higher concentration of carbon ) though it can also produce bright blue flame it there is sufficeint oxygen.

X- CH₃-CH₂-CH₂

Y- CH₂-CH-CH₃

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