Which of the following statements is/are...

Which of the following statements is/are correct?

Aluminium wire is used in Beilstein test.

Nitrogen gas is quantitatively estimated in dumas method.

In Kjeldahl'smethod organic compound is reacted with conc. `H_2SO_4,K_2SO_4` and `NaSO_4` are also added.

All organic compounds contains both C and H.

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The correct Answer is:

(a). `Cu` wire used
(c). `K_2SO_4` and `CuSO_4` are added.
(d). `H` is not always present.

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Which of the following statement is/are correct?

The diagonals of a rectangle are perpendicular

The diagonals of a rhombus are equal

Every square is a rhombus

None of these

`H_(2)S_(3)O_(6)` has two S-S linkage

`H_(2)O_(2),O_(2)F_(2)` Marshal's acid and caro's acid all have peroxy linkage

`B_(3)N_(3)H_(6)` is planar but having net dipole moment non zero

`Na+_(2)B_(4)O_(7).10H_(2)O` has 5 B-O-B loinkage

`[Ag(NH_(3))_(2)]^(+)` is linear with sp hybridised `Ag^(+)` ion.

`NiCl_(4)^(2-), VO_(4)^(3-)" and "MnO_(4)^(-)` have tetrahedral geometry.

`[Cu(NH_(3))_(4)]^(2+), [Pt(NH_(3))_(4)]^(2+)" and "[Ni(CN)_(4)]^(2-)` have `dsp^(2)` hybridisation of the metal ions.

`Fe(CO)_(5)` have trigonal bipyramidal structure with `dsp^(3)` hybridised iron.