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Why bases does not react with metal carbonate or metal bicarbonate?

Answers:

Metal Carbonates do not react with bases because metal carbonates are itself bases.
So base when added to base gives no reaction.
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GIVE EXAMPLE OF POLYNOMIALS p(x),g(x)and r(x), which satisfy the division algorithm and:
 deg p(x)=deg q(x)
 deg q(x)=deg r(x)
 deg r(x)=0
PLS GIVE THE ANSWER........

THANK YOU VERY MUCH.........
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Answers:

We can write many such examples
(i) deg p(x) = deg q(x)
P(x) = x^{2}, q(x) = x^{2}, g(x) = 1, R(x) = 0
(ii) deg q(x) = deg r(x)
q(x) = x , R(x) = x , p(x) = x^{2} + x, g(x) = x^{2}
(iii) deg r(x) = 0
q(x) = 1 , R(x) = 1 , p(x) = x+1, g(x) = x
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Let a b c p be rational numbers such that p is not perfect cube . if a +bp^1/3+cp^2/3=0 then prove a=b=c=0

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As p is not a perfect cube. Hence p^{1/3 }and p^{1/3 }, p^{2/3 }are irrartional numbers. Then we have b p^{1/3 }+c p^{2/3 }as irrational and a as rational. As sum of a rational number and an irrational number cannot give us a zero as answer so all the coefficiants (a,b and c) must be zero in general.
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 Molality of NaOH is 1.25,percent by weight of NaOH is.......
 The only primary alcohol that can be prepared by the indirect hydration of alkene is.....

Answers:

 The only primary alcohol that can be prepared by the indirect hydration of alkene is ethyl alcohol
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Why is some food left undigested?

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During digestion of food by products are formed that we can not digest.
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Why can't our body digests certain types of food?

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Humans cannot digest certain types of food because the appropriate enzymes to breakdown the molecules, are lacking in our body.
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Why do we produce saliva when we see food?

The process of digestion starts in our mouth when we start chewing food(in most cases). Most of the saliva helps breakdown all the starch and other compounds to sugars.
So whenever you see and smell some delicious food your brain perceives you will eat it and hence asks the salivary glands to release the saliva in advance which we call mouthwatering.

But why is saliva produced when we see food?
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Answers:

The process of digestion starts in our mouth when we start chewing food(in most cases). Most of the saliva helps breakdown all the starch and other compounds to sugars. So whenever you see and smell some delicious food your brain perceives you will eat it and hence asks the salivary glands to release the saliva in advance which we call mouthwatering.
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Name any two pre colonial parts of India?

Answers:

Ans. Three Indian ports of precolonial :
 Surat on the Gujarat coast
 Hoogly in Bengal
 Masulipatam on the coromandel coast
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How come alimentary canal ( 9 metres ) can be longer than humans?

Answers:

Alimentary canal is longer but fits in our body as it is of different shapes and sizes at different levels.
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When did export of British cottons goods increase dramatically?

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Ans. Exports of British cotton goods increased dramatically in the early nineteenth century. Produced by machines at lower costs, the imported cotton goods were so cheap that weavers could not easily compete with them. They were better in quality and cheaper in process than Indian textiles.
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Name any two pre colonial parts of India?
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Answers:

Ans. Three indian ports of precolonial :
 Surat on the Gujarat coast
 Hoogly in Bengal
 Masulipatam on the coromandel coast
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 DNAase and RNAase are enzymes produced by....
 In case of taking food rich in lime juice, the action of ptylin on starch is.....
 Fatty acids and glycerol are first absorbed by........

Answers:

 DNAase and RNAase are enzymes produced by Pancreas.
 In case of taking food rich in lime juice, the action of ptylin on starch is reduced
 Fatty acids and glycerol are first absorbed by lacteal
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What is gestation?

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Gestation is the process of development of fetus, beginning with fertilization and ending at birth. The duration of gestation period varies between species.
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If a+b=5 and 3a+2b=20, Then value of a+b is:
1) 10
2) 15
3) 20
4) 25

you have already given value of a+b = 5 then what is the use of asking.
it should be a printing mistake. you have to find value of 3a+b
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Answers:

Ooo.
But this ques. had come in chs exam
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Question Must be : If a + b = 5 and 3a + 2b = 20, then 3a + b will be
Ans. 4) 25
a + b = 5 .............(1)
3a + 2b = 20 .........(2)
From (1), a = 5  b
put this value in (2), we get
=> 3( 5  b ) + 2b = 20
=> 15  3b + 2b = 20
=>  b = 5
=> b = 5
put values of b in (1), we get
=> a  5 = 5
=> a = 10
Now, 3a + b = 3(10 )  5
= 30  5 = 25
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The original inhabitants of a country are called:
1) residents
2) natives
3) aborigines
4) ancestors

Answers:

3) aborigines
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Voltmeter has high resistance so that:
1) it takes large current from the circuit
2) it takes a negligible current from the circuit
3) it can be connected in series
4) none of these

Answers:

2) it takes a negligible current from the circuit
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A 500 gm packet having volume 300 cm^{3} is placed in water (density of water = 1gm/cm^{3}). The packet will:
1) float in water
2) sink in water
3) displace 500 gm water
4) displace 500 cm^{3} water.

Answers:

2) sink in water
Explanation : density of packet ={tex}Mass \over Volume {/tex}
= {tex}500\over 300 {/tex}= 1.66 gm/cm^{3}
It has higher density than water so it ll sink
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Name the most dynamic industry of Britain in 18th 19th century

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Ans. The most dynamic industry of Britain in 18th 19th century was Cotton and Metal Industry.
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Write the name of the first symbol of new Era in England

Answers:

Ans. Cotton was the first symbol of the new era (in britain). Until the 1840s, cotton was the leading sector in the first phase of industrialisation.
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Describe the role of army in the early Roman empire.What was the policy of the roman emperors towarsds more expansionof the empire in the first two centuries?

Answers:

Ans. Next to the emperor and the Senate, the other key institution of imperial rule was the army. Romans had a paid professional army where soldiers had to put in a minimum of 25 years of service. The army was the largest single organised body in the empire with 600,000 soldiers in the fourth century. The soldiers would constantly agitate for better wages and service conditions. These agitation often took the form of mutinies.
The emperor, the aristocracy and the army were the three main ‘players’in the political history of the empire. The success of individual emperors depended on their control of the army, and when the armies were divided, the result usually was civil war. Except for one notorious year (69 CE), when four emperors mounted the throne in quick succession, the first two centuries were free from civil war.The emperor Augustus reigned from 27 BC to AD 14 with absolute power. He reestablished political and social stability and launched two centuries of prosperity called the Roman Peace (Pax Romana). During the first two centuries Ad the empire flourished and added new territories as ancient Britain, Arabia, and Dacia (presentday Romania). People from the provinces streamed to Rome and became soldiers, bureaucrats, senators, and even emperors. Rome developed into the social, economic, cultural capital of the Mediterranean world. Most emperors ruled sensibly and competently till military and economic disasters brought on the political instability of the 3rd century AD.
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What is meant by 'principate'in context of the roman empire ?What was the positon of of emperor and Senate in it?

Answers:

Ans. The regime established by Augustus, the first emperor, in 27 BCE was called the ‘Principate’. Although Augustus was the sole ruler and the only real source of authority, the fiction was kept alive that he was actually only the ‘leading citizen’ not the absolute ruler. This was done out of respect for the Senate.
Senate was the body which had controlled Rome earlier, in the days when it was a Republic. The Senate had existed in Rome for centuries, and had been and remained a body representing the aristocracy, that is, the wealthiest families of Roman and later Italian descent mainly landowners.
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What is osmosis?

Answers:

Osmosis is a process in which the water molecules move from high concentration region to a low concentration region through a semipermeable membrane.
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Osmosis is the process in which water molecules moves from the region of high concentration to a region of low concentration through a semi permeable membrane.
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An electric heater of resistance 8 Ohm draws 15Amp. from the service mains 2hrs. What will be the rate at which heat is developed in the heater ?
(If you feel some error in the question then please tell me because this is an NCERT question.)

I think your answer will come 1800W.
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Answers:

Ans. Given
Resistance of heater R = 8 OhmCurrent I = 15 A
Time = 2 Hours = {tex}2\times 3600 = 7200 \ s{/tex}
According to Joule's Law of Heating:
Heat Generated H = {tex}I^2 .R. T{/tex}
Rate of Heat Generated = {tex}H\over T{/tex} = {tex}{I^2.R.T\over T} = I^2.R{/tex}
= {tex}(15)^2\times 8 = 225\times 8 = 1800 \ J/s{/tex}
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How to find chemical reactants and products symbolically?

Answers:

6CO_{2 }+ 12H_{2}O > C_{6}H_{12}O_{6 }+ 6O_{2} + 6H_{2}O
REACTANTS: CARBON DIOXIDE  CO_{2}
WATER  H_{2}O
PRODUCTS: GLUCOSE  C_{6}H_{12}O_{6}
OXYGEN  O_{2}
WATER  H_{2}O
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Convert into like decimal
(1). 6.5, 16.03

Answers:

We observe that in the given decimals 6.5, 16.03 the maximum number of decimal places is two.
The decimal 16.03 has the maximum number of decimal places, i.e., 2.
So, we convert each of the other decimal numbers into the one having two places of decimal.
So, 6.5 is written as 6.50
16.03 is already having two decimal places.
Therefore, 6.50, and 16.03 are expressed as like decimals.
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Give me information about courseOf term1 or SA1

Answers:

There will be no SA 1 this year. Syllabus for 1st exam will be decided by school.
Thank you.
Sorry for replying late.
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A wire's diameter is doubled. What will be the new resistance?

Answers:

Ans.
We know that
Resistance R = {tex}\rho {L\over A}{/tex}
Where {tex}\rho{/tex} is resistivity of material
L is length of wire
A is area of Crosssection of wire
Area A = {tex}\pi r^2{/tex}
If we double the Diameter it means radius is also doubled
So now Area = {tex}\pi (2r)^2= 4\pi r^2{/tex} = 4A
So New Resistance R' = {tex}\rho {L\over 4A} = {R\over 4}{/tex}
Means new resistance will be {tex}({1\over 4})^{th}{/tex} of old resistance .
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Why nitrogen is filled in the cyllinders of scuba divers if it blocks our capillaries.

Answers:
The value of tan 90' is not defined . Why ?

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Tangent of an angle is equal to the perpendicular divided by the base, As the angle approaches 90 degree, the value of the perpendicular starts to rise at abnormally higher rate but the value of the base remains same.
At 90 degree, there will be no triangle as the perpendicular and hypotenuse will never meet or meet at infinity and in that case perpendicular and the hypotenuse both wil be infinie..
tan 90 will be infinite
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If cos (a+b)=0, then sin (ab)=
1) cos 2b
2) cos b
3) sin 2a
4) sin a

Answers:

1) cos 2b
Explanation:
cos (a+b) =0
=> cos (a+b) = cos 90
=> a+b = 90
=> a = 90 b
Now
sin(a+b)
= sin(90bb)
= sin(902b)
= cos 2b [as sin (90  x) = cos x]
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