What is the fuel of atomic pile ?

• Thorium

• Sodium

• Uranium

• Petroleum

${}_{90}\mathrm{Th}^{232} \to {}_{82}\mathrm{Pb}^{208}.$ The number of $\mathrm{\alpha }$ and $\mathrm{\beta }$-particles emitted during the above reaction is

• $8\mathrm{\alpha } \mathrm{and} 4\mathrm{\beta }$

• $8\mathrm{\alpha } \mathrm{and} 16\mathrm{\beta }$

• $4\mathrm{\alpha } \mathrm{and} 2\mathrm{\beta }$

• $6\mathrm{\alpha } \mathrm{and} 4\mathrm{\beta }$

Geometry of ${\mathrm{SiO}}_4^{4-}$ anion is

• tetrahedral

• trigonal

• trihedral

• pentagonal

The standard ${\mathrm{E}}_{\mathrm{red}}^{°}$ values of A, B  and C are +0.68 V, - 2.54 V,- 0.50 V respectively. The rder of their reducing power is

• A> B >C

• A> C > B

• C > B > A

• B > C > A

The hydrolysis of sodium carbonate involves the reaction between

• sodium ion and water

• Na⁺ and OH^-

• ${\mathrm{CO}}_3^{2-} \mathrm{and} \mathrm{water}$

• ${\mathrm{CO}}_3^{2-} \mathrm{and} {\mathrm{H}}^{+}$

Which one of the following reacts with glass?

• H₂SO₄

• HF

• HNO₃

• K₂Cr₂O₇

Which one of the following can be purified by sublimation ?

• F₂

• Cl₂

• Br₂

• I₂

Monosilane on coming in contact with air bums with a luminous flame producing vortex rings. These rings are of

• SiO₂

• SiO

• Si

• H₂SiO₃

2 2-dichloro propane on hydrolysis yields

• acetone

• 2, 2-propane diol

• isopropyl alcohol

• acetaldehyde

20.

Carborundum is

• SiC

• Al₂O₃$·$H₂O

• Al₂(SO₄)₃

• AlCl₃