Every question from past board papers on Valence, oxidation states and chemical reactivity, newest paper first. Open any question for its full worked answer.
Which of the following statements are NOT correct?
A. Hydrogen is used to reduce heavy metal oxides to metals.
B. Heavy water is used to study reaction mechanism.
C. Hydrogen is used to make saturated fats from oils.
D. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.
E. Hydrogen reduces oxides of metals that are more active than iron.
Choose the most appropriate answer from the options given below :
Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI.
Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases.
In the light of the above statements, choose the correct answer from the options given below.
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it ?
The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.
Match the following :
Oxide | Nature
(a) CO (i) Basic
(b) BaO (ii) Neutral
(c) Al\(_2\)O\(_3\) (iii) Acidic
(d) Cl\(_2\)O\(_7\) (iv) Amphoteric
Which of the following is correct option ?
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is :
Which of the following is an amphoteric hydroxide ?
The method used to remove temporary hardness of water is :
Which of the following oxides is most acidic in nature ?
