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Which of the following processes does not involve the oxidation of iron?
The behaviour of samarium ($Z=62$) is very much like europium ($Z=63$), since both elements:
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s² at a distance of 5 m from the mean position. The time period of oscillation is
Which of the following oxides is most acidic in nature?
Match List-I with List-II: **List-I (Element)** (A) Fe (B) V (C) Mn (D) Ti **List-II (Most Common oxidation state/s)** (I) +2, +7 (II) +3, +2 (III) +4 (IV) +5 Choose the correct answer from the options given below:
The common oxidation state shown by actinoids is +3 with the other oxidation states being +4, +5, +6, and +7. Rank the following elements in decreasing order of the number of oxidation states they display: A. Np ($Z=93$) B. Am ($Z=95$) C. Ac ($Z=89$) D. Pa ($Z=91$) Choose the correct answer from the options given below:
In acidic medium, $\text{H}_2\text{O}_2$ changes $\text{Cr}_2\text{O}_7^{2-}$ to $\text{CrO}_5$ which has two (–O – O–) bonds. The oxidation state of $\text{Cr}$ in $\text{CrO}_5$ is:
Sweet potato is a modified
The general electronic configuration of lanthanoids is:
The basic character of the transition metal monoxides follows the order: (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)
Four successive members of the first series of the transition metals are listed below. For which one of them does the standard potential (E° M²⁺/M) value have a positive sign?
Plants having little or no secondary growth are
Which of the following exhibits only a +3 oxidation state?
Compound 'A' in acidic medium does not give a precipitate with $H_2S$ but in $NH_4OH$ medium gives a precipitate. Compound 'A' is:
Which of the following elements can combine with chlorine to form more than one binary compound?
An element among the following that exhibits the maximum oxidation state is:
Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because:
Select the wrong statement :
The compound among the following that is used in cosmetic surgery is:
Streptokinase produced by bacterium Streptococcus is used for