The Cobalt isotope of mass 60 decays with a half-life of 5 - 3 years. How many years does it take for 7/8 of a sample of 500 g of Cobalt-60 to disintegrate

1.  10.6

2.  4.6

3.  15.9

4.  9.2

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4
Correct Answer :

15.9


Explanation :
No Explanation available for this question

The reaction of I2with Na2S2O3gives NaI and

1.  SO2

2.  Na2S2O6

3.  Na2S4O6

4.  Na2S2O8

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4
Correct Answer :

Na2S4O6


Explanation :
No Explanation available for this question

If a reaction obeys the following equation. K=2.303/t log10a/a-x, the order of the reaction will be

1.  zero

2.  first

3.  second

4.  third

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4
Correct Answer :

first


Explanation :
No Explanation available for this question

Which of the following electronic configurations corresponds to an inert gas

1.  1s22s22p5

2.  1s22s22p6

3.  1s22s1

4.  1s22s22p63s1

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4
Correct Answer :

1s22s22p6


Explanation :
No Explanation available for this question

Which of the following alloys contains Cu & Zn

1.  Bronze

2.  Brass

3.  Gunmetal

4.  Type metal

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4
Correct Answer :

Brass


Explanation :
No Explanation available for this question

The 4f level is successively filled up in

1.  Alkali metals

2.  Rare gases

3.  Lanthanides

4.  Actinides

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4
Correct Answer :

Lanthanides


Explanation :
No Explanation available for this question

In which of the following does sulphur has the lowest oxidation number

1.  H2SO4

2.  SO2

3.  H2SO3

4.  H2S

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4
Correct Answer :

H2S


Explanation :
No Explanation available for this question

The oxidation number of manganese in KMnO4is

1.  3

2.  5

3.  7

4.  9

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4
Correct Answer :

7


Explanation :
No Explanation available for this question

Silver is extracted from its (.....) ore

1.  Sulphide

2.  Oxide

3.  Nitrate

4.  Halide

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4
Correct Answer :

Sulphide


Explanation :
No Explanation available for this question

A solution that obeys Rault's law is called

1.  Normal Solution

2.  Molar Solution

3.  Ideal Solution

4.  Saturated Solution

View Answer  
4
Correct Answer :

Ideal Solution


Explanation :
No Explanation available for this question
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