75607 + Interview Questions in Secondary School in Science

1.	2d) law of conHow many moles are present in 11.5 g of sodium ?(a) 0.5 mol(b) 5.0 mol(c) 0.05 mol(d) 1.5 molof the following the valency of each of the
Answer» Answer: (a) 0.5 molecular Explanation: The MOLAR mass of NA is equal to 23g/mol. The formula to find out the number of moles is given by \frac{weight}{molar mass}. molarmass weight . . THEREFORE the number of moles in 11.5g of sodium or Na is equal to \frac{11.5}{23} 23 11.5 which gives us 0.5. Now to further find out the value of the amount of the atoms present in it then we multiply the TOTAL number of given moles in it to the Avogadro number which is $$6.022\times 10^2^3$$ therefore $$0.3\times6.022\times10^2^3$$ is $$3.011\times10^2^3.$$ .

1.

2d) law of conHow many moles are present in 11.5 g of sodium ?(a) 0.5 mol(b) 5.0 mol(c) 0.05 mol(d) 1.5 molof the following the valency of each of the

Answer»

Answer:

(a) 0.5 molecular

Explanation:

The MOLAR mass of NA is equal to 23g/mol.

The formula to find out the number of moles is given by \frac{weight}{molar mass}.

molarmass

weight

. .

THEREFORE the number of moles in 11.5g of sodium or Na is equal to \frac{11.5}{23}

23

11.5

which gives us 0.5.

Now to further find out the value of the amount of the atoms present in it then we multiply the TOTAL number of given moles in it to the Avogadro number which is $$6.022\times 10^2^3$$ therefore $$0.3\times6.022\times10^2^3$$ is $$3.011\times10^2^3.$$ .

11.	The chemical secretion secreted by endocrine glands is called *1 pointHormoneenzymeco enzymeNone of the above
Answer» The chemical secretion SECRETED by endocrine glands is called Hormone.

48.	hari travels to school with a speed of 10 km/h and returned with a speed of 20 km/h.Find the average speed of his journey
Answer» FIRST you have to find the AVERAGE SPEED of 10 and then double it

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___is techniquethat is used tofocuss attention away from distressingthoughts

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3. Which color change isobserved on adding a drop ofphenolphthalein is added to asolution of calcium hydroxide ?

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The physical symptoms may be a means of

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1. Where do we get paper from?

(a) Ripening of fruits(b) Melting of ice(c) Bursting of a cracker(d) Dissolving salt in water(e) Sharpening of a pencil(1) Opening of a bud

The lack of one or more food components in the body for a long time iscalled _____ ?1) Goitre2) Deficiency disease3) Marasmus

Whats the answer of all 3

Name the plant in which two parts of plants are edible

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