Amongst the following identify the species with an atom in (+6) oxidation state.

1. MnO4-

2. Cr(CN)3-6

3. NiF62-

4. CrO2Cl2

निम्नलिखित में से (+6) ऑक्सीकरण अवस्था वाले एक परमाणु की स्पीशीज की पहचान कीजिए।

1. MnO4-

2. Cr(CN)3-6

3. NiF62-

4. CrO2Cl2

 73%
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When NaCl is dissolved in water, the sodium ion becomes:

1. oxidised

2. reduced

3. hydrolysed

4. hydrated

जब NaCl जल में घुल जाता है, तो सोडियम आयन क्या हो जाता है?

(1) ऑक्सीकृत 

(2) अपचयित 

(3) जलअपघटित

(4) जलयोजित

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Which of the following is the strongest oxidising agent

(1) BrO3/Br2+,Eo=+1.50

(2) Fe3+/Fe2+,Eo=+0.76

(3) MnO4/Mn2+,Eo=+1.52

(4) Cr2O72/Cr3+,Eo=+1.33

निम्नलिखित में से कौन सबसे प्रबल ऑक्सीकारक है

(1) BrO3/Br2+,Eo=+1.50

(2) Fe3+/Fe2+,Eo=+0.76

(3) MnO4/Mn2+,Eo=+1.52

(4) Cr2O72/Cr3+,Eo=+1.33

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Which metal exhibits more than one oxidation states?

1. Na

2. Mg

3. Al

4. Fe

कौन सी धातु एक से अधिक ऑक्सीकरण अवस्थाओं को प्रदर्शित करती है?

(1) Na

(2) Mg

(3) Al

(4) Fe

 68%
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2MnO4-+5H2O2+6H+2 Z+5O2+8H2O. In this reaction Z is :

1. Mn2+

2. Mn4+

3. MnO2

4. Mn

2MnO4-+5H2O2+6H+2 Z+5O2+8H2O। इस अभिक्रिया में Z है:

1. Mn2+

2. Mn4+

3. MnO2

4. Mn

 64%
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3Cl2 + 6NaOH 5NaCl + NaClO3 + 3H2O, the equivalent weight of NaOH will be

1. 40

2. 48

3. 60

4. 80

3Cl2+ 6NOH5NaCl + NaClO3 + 3H2O, NaOH का तुल्यांकी भार होगा?

1. 40

2. 48

3. 60

4. 80

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The equivalent weight of H3PO2, when it disproportionates into PH3 and H3PO3 is 

1. 66

2. 49.5

3. 33

4. 20.5

H3PO2 का तुल्यांकी भार, जब यह PH3 और H3PO3 में असमानुपाती हो जाता है:

1. 66

2. 49.5

3. 33

4. 20.5

 50%

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25.0 g of FeSO4.7H2O was dissolved in water containing dilute H2SO4, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO4 solution for complete oxidation. The percentage of FeSO4. 7H2O in the acid solution is

(1) 78%

(2) 98%

(3) 89%

(4) 79%

FeSO4.7H2O के 25.0 g को तनु H2SO4 युक्त जल में घोला गया, और आयतन 1.0 L बनाया गया। इस विलयन के 25.0 mL का पूर्ण ऑक्सीकरण के लिए N/10 KMnO4 विलयन के 20 mL की आवश्यकता होती है। अम्ल विलयन में FeSO4. 7H2O का प्रतिशत है-

(1) 78%

(2) 98%

(3) 89%

(4) 79%

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1.575 gm crystalline oxalic acid |      COOHCOOH·xH2O is dissolved in water and diluted upto 250 ml. 25ml of this solution is completely neutralised with 250ml N/10 NaOH. The value of 'x' is 

1. Zero

2. 1

3. 2

4. 5

1.575 g क्रिस्टलीय ऑक्सेलिक अम्ल जल में घोला जाता है और 250 mL तक तनु किया जाता है। इस विलयन के 25ml को 25ml N/10 NaOH के साथ पूर्णतया उदासीन किया जाता है। 'X' का मान है

1.शून्य 

2. 1

3. 2

4. 5

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MnO2 + 4HCl MnCl2+2H2O+Cl2, the equivalent wt. of HCl will be (MMol wt of HCl)

1. M

2. M/2

3. 2M

4. M/4

MnO2 + 4HCl MnCl2+2H2O+Cl2, HCl का तुल्यांकी भार होगा-        (MHCl का मोलर भार)

1. M

2. M/2

3. 2M

4. M/4

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