Which of the following have similar magnetic moment: Fe, Fe2+ and Fe3+?

Fe2++Sn4+⇌Fe3++Sn2+উপরের বিক্রিয়াটিতে-i. Fe2+ জারিত হয়েছে ii. Sn4+ বিজারকiii. Fe3+ একটি ইলেকট্রন গ্রহণ করেছেনিচের কোনটি সঠিক?

A

i ও ii

B

ii ও iii

C

i ও iii

D

i, ii ও iii

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
My tooth-brush is a thing that haunts me when Im travelling, and ______ my life a misery. I _ that I havent packed it, and wake up in a cold ____, and get out of bed and hunt for it. And, in the morning, I pack it before I have used it, and have to unpack again to get it, and it is always the last thing I turn out of the bag; and _ I repack and forget it, and have to rush upstairs _ it at the last moment and carry it to the railway station, wrapped up in my pocket-handkerchief. Of course I had to turn every mortal thing out now, and, of course, I could not find it.
have to rush upstairs _______ it at the last moment

A

for

B

of

C

from

D

form

An atom with net magnetic moment $$\overrightarrow \mu $$ and net angular momentum $$\overrightarrow {\bf{L}} \left( {\overrightarrow \mu = \gamma \overrightarrow {\bf{L}} } \right)$$ is kept in a uniform magnetic induction $$\overrightarrow {\bf{B}} = {B_0}{\bf{\hat k}}.$$ The magnetic moment $$\overrightarrow \mu \left( { = {\mu _x}} \right)$$ is

A

$$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + \gamma {B_0}{\mu _x} = 0$$

B

$$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + \gamma {B_0}\frac{{d{\mu _x}}}{{dt}} + {\mu _x} = 0$$

C

$$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + {\gamma ^2}B_0^2{\mu _x} = 0$$

D

$$\frac{{{d^2}{\mu _x}}}{{d{t^2}}} + 2\gamma {B_0}{\mu _x} = 0$$

Which of the following enzymes do not use Fe2+ or Fe3+ ions as cofactors?

A

Cytochrome oxidase

B

Dinitrogenase

C

Catalase

D

Peroxidase

নিচের বিক্রিয়ার জারক চিহ্নিত কর। Fe2++2H++NO3→Fe3++NO2+H2O

A

Fe2+

B

H

C

NO3

D

H2O

নিম্নের কোন পরীক্ষার সাহায্যে Fe2+ এবং Fe3+ এর পার্থক্য করা যায়?

A

পটাসিয়াম ফেরিসায়ানাইড দ্রবণ পরীক্ষা

B

AgNO2 দ্রবণ পরীক্ষা

C

ফেলিং দ্রবণ পরীক্ষা

D

শিখা পরীক্ষা

2KMnO4 +8H2SO4+10FeSO4+2MnSO4+8H2O+Fe2SO43 বিক্রিয়ায় KMnO4 জারক Fe3+ আয়ন জারক Fe2+ আয়ন জারক

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

Fe3+এর তুলনায় Fe2+এর আয়নীকরণ বিভব-

A

Fe2+এর বেশি

B

Fe2+এর কম

C

সমান

D

কোনটিই নয়

Sn4+ Fe2+→Sn2+ Fe3+ বিক্রিয়াটিতে কোনটির বিজারণ ঘটেছে?

A

Fe2+

B

Fe3+

C

Sn2+

D

Sn4+

Read the passage carefully and select the best answer to each question out of the given four alternatives.
Public opinion may be passive and false or active and real. It is claimed in theory that all governments are ultimately based on the opinion or sanction of the governed. But we find that in practice the people's rights are often trodden down and tyranny and oppression are allowed to continue. The government does it not because the people want it to do so but because they are too idle, too uneducated and too disunited or timid to oppose the govern ment. Such public opinion is passive and false and not an active verdict. But when we find people alert, intelligent and determined to let the government know their will, when they want to exercise actively their voice in the management of their country, we have an instance of true or active public opinion. True public opinion is formed by and expressed through the press, the platform, political parties and educational institutions. These have sacred duties to perform, duties on which depends the ultimate good of the entire community. The press today wields a tremendous influence, So it should support the causes and move ments and condemn the wrong one's and thus teach people to form correct opinion. A free and fair press ventilates the grievances of the public. Thus a healthy relationship develops between the people and the government through out an unbiased press. Political parties also help to create and regulate opinions. No less important part is played by the educational Institutions which train the minds of the young people who will be the citizens of tomorrow. It has been said that modern Germany and China have been made by their universities. It is necessary that the young and the growing minds should imbibe the spirit of fellow-feeling, the spirit of tolerance, the habit of compromise, and show due regard for the feelings and opinion of others without which a democratic society cannot function, let alone succeed. When there is true awakening of the people, we shall have the real and conscious public opinion. And justice will reign on earth and truly will the voice of the people be the voice of God.
According to the passage, which of the following is needed from the people to have true or active public opinion? 1. Alertness
2. Determination
3. Intelligence
4. Raising their voice

A

1, 2 and 3

B

Only 4

C

2 and 3

D

All of these