1
IIT-JEE 1985
MCQ (Single Correct Answer)
+1
-0.25
Molecular formula of Glauber's salt is:
A
MgSO4.7H2O
B
CuSO4.5H2O
C
FeSO4.7H2O
D
Na2SO4.10H2O
2
IIT-JEE 1985
Subjective
+1
-0
Write down the balanced equations for the reaction when:
Calcium phosphate is heated with a mixture of sand and carbon;
3
IIT-JEE 1985
True or False
+1
-0
If three complex numbers are in A.P. then they lie on a circle in the complex plane.
A
TRUE
B
FALSE
4
IIT-JEE 1985
MCQ (Single Correct Answer)
+2
-0.5
If $$a,\,b,\,c$$ and $$u,\,v,\,w$$ are complex numbers representing the vertics of two triangles such that $$c = \left( {1 - r} \right)a + rb$$ and $$w = \left( {1 - r} \right)u + rv,$$ where $$w = \left( {1 - r} \right)u + rv,$$ is a complex number, then the two triangles
A
have the same area
B
are similar
C
are congruent
D
none of these
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