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Question

The oxide of a metal contains 60 % of the metal. What will be the percentage of bromine in the bromide of the metal. If the valencey of the metal is the same in both the oxide and the bromide?

Possible Answers

Selected	Possible Answer
	$\sim 93$
	$\sim 77$
	$\sim 70$
	$\sim 87$

Question

Versene, a chelating agent as chemical formula C_2H_4N_2(C_2H_2O_2Na)_4 . If each mole of this compound could bind 1 mole of $Ca^{2+}$ then the rating of pure versene expressed as mg of CaCO_3 bound per gram of chelating agent is -

Possible Answers

Selected	Possible Answer
	200 mg
	263 mg
	163 mg
	100 mg

Question

For the cell prepared from electrodes A and B;
Electrode A : $Cr_2O_7^{2-}|Cr^{3+}E_{red}^0=+1.33V$
Electrode B: $Fe^{3+}|Fe^{2+}E_{red}^0=+0.77V$
Which of the following statements are correct?

Possible Answers

Selected	Possible Answer
	A will be positive electrode
	The e. m. f of the cell will be 0.56 V
	The electron will flow from B to A when connections are made
	All are correct

Question

Two radioactive materials X_1 and X_2 have decay constants $10\lambda$ and $\lambda$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X_1 to that of X_2 will be $\frac {1}{e}$ after a time

Possible Answers

Selected	Possible Answer
	$1/(11\lambda)$
	$1/(10\lambda)$
	$1/(9\lambda)$
	$11/(10\lambda)$

Question

Imagine an atom made up of proton and a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Bohr atomic model and consider all possible transitions of the hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength $\lambda$ (given in terms of Rhydberg constant R for hydrogen atom ) equal to

Possible Answers