sodium hydroxide is a strong alkali
sodium is more reactive than zinc
zinc is more reactive than sodium
zinc hydroxide is amphoteric
zinc hydroxide is unstable
Correct answer is D
No explanation has been provided for this answer.
The gas in air used by plants for photosynthesis is
Argon
Carbon (IV) oxide
Nitrogen
Oxygen
Water vapour.
Correct answer is B
No explanation has been provided for this answer.
Which of these arrangement of elements is in order of increasing ionization energy?
Boron, Carbon, Flourine, Nitrogen
Boron, Carbon, Nitrogen, Flourine
Carbon, Boron, Nitrogen, Flourine
Flourine, Nitro9en, Carbon, Boron
Nitrogen, Flourine, Carbon, Boron
Correct answer is B
No explanation has been provided for this answer.
The following acids are monobasic EXCEPT
dioxonitrate (Ill) acid
ethanedioic acid
hydrobromic acid
methanoic acid
oxochlorate (I) acid
Correct answer is B
No explanation has been provided for this answer.
An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
ZS3
ZSO3
ZS04
Z03
Z3Cl2
Correct answer is D
No explanation has been provided for this answer.