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Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

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The distance of the point (1, 0, 2) from the point of intersection of the line $3x−2 =4y+1 =12z−2 $and the plane x y + z = 16, is :

When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is $2.5×10_{−4}ms_{−1}$. If the electron density in the wire is $8×10_{28}m_{−3}$, the resistivity of the material is close to :

This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement- I: Higher the range, greater is the resistance of ammeter. Statement- II: To increase the range of ammeter, additional shunt needs to be used across it.

Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is :

Let $T_{n}$be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If $T_{n+1}−T_{n}=10$, then the value of n is

Which among the following is the most reactive ?

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $E_{M_{3+}/M_{2+}}$ value ?

Which of the following is the energy of a possible excited state of hydrogen?