Zn and Hf have almost equal atomic and ionic radii because of

1.  Diagonal relationship

2.  Similar chemical properties

3.  Lanthanide contraction

4.  Similar electronegativity values

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4
Correct Answer :

Lanthanide contraction


Explanation :
No Explanation available for this question

Which of the following has lowest magnetic moment

1.  Cu2+

2.  Ni2+

3.  Fe2+

4.  Cr2+

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4
Correct Answer :

Cu2+


Explanation :
No Explanation available for this question

An aqueous solution of a substanc gives, a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating, when hydrogen sulfide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a :

1.  Hg22+ Salt

2.  Cu22+ Salt

3.  Ag+ Salt

4.  Pb2+

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4
Correct Answer :

Hg22+ Salt


Explanation :
No Explanation available for this question

Copper has the following properties except

1.  It is soft, malleable and ductile

2.  Its surface gets tarnished on exposure to air

3.  It is a bad conductor of heat and electricity

4.  It is a reddish brown metal

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4
Correct Answer :

It is a bad conductor of heat and electricity


Explanation :
No Explanation available for this question

In acidic medium if potassium permanganate is used as an oxidising agent, we get:

1.  MnO42

2.  Mn2+

3.  MnO2

4.  Mn2O3

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4
Correct Answer :

Mn2+


Explanation :
No Explanation available for this question

Acidified potassium dichromate is treated with hydrogen sulphide. In this reaction, the oxidation number of chromium

1.  Increases from +3 to +6

2.  Decreases from +6 to +3

3.  remains unchanged

4.  Dem +6 to +2

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4
Correct Answer :

Decreases from +6 to +3


Explanation :
No Explanation available for this question

The element which is present in every amalgam is

1.  Iron

2.  Sodium

3.  Mercury

4.  Silver

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4
Correct Answer :

Mercury


Explanation :
No Explanation available for this question

Which of the following is not an alloy of tin

1.  Brass

2.  Solder

3.  Gun metal

4.  Babbit metal

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4
Correct Answer :

Brass


Explanation :
No Explanation available for this question

The colour of lanthanides and actinides is due to

1.  s - f transition

2.  p - f transition

3.  d - f transition

4.  f - f transition

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4
Correct Answer :

f - f transition


Explanation :
No Explanation available for this question

Brass is an alloy of

1.  Copper and zinc

2.  Copper and tin

3.  Copper and nickel

4.  Iron and nickel

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4
Correct Answer :

Copper and zinc


Explanation :
No Explanation available for this question
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