Which substance can be used for disinfecting water ?
Which substance can be used for disinfecting water ?
A. KMnO4
B. Alums
C. Ozone
D. All
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By which method the molecular mass of benzene was determined as 78.108 ?
By which method the molecular mass of benzene was determined as 78.108 ?A. Specific gravity method
B. Vapour density method
C. X-ray diffraction method
D. Distillation methosFree neutron changes into proton with the emission of__________________?
Free neutron changes into proton with the emission of__________________?A. Neutrino
B. Electron
C. Both A & B
D. MesonPlanks theory says energy is emitted__________________?
Planks theory says energy is emitted__________________?A. In continuous manner
B. Discontinuous manner
C. Simultaneously
D. In the form of heatThe reduction potential Zn is_________________?
The reduction potential Zn is_________________?A. 0.76
B. -0.76
C. -0.55
D. 0.55The melting points and boiling points upto meddle of 3d- series ____________________?
The melting points and boiling points upto meddle of 3d- series ____________________?A. increases
B. decreases
C. remain same
D. no regular trendIn electrolysis of NaCl the product obtained at cathode is_______.
In electrolysis of NaCl the product obtained at cathode is_______.A. Sodium ions
B. Chloride ions
C. Both
D. Remain at the bottom of the cell