What is the oxidation number of Co in [Co(NH3)4ClNO2]

(1) + 2

(2) + 3

(3) + 4

(4) + 5

[Co(NH3)4ClNO2] में Co की ऑक्सीकरण संख्या क्या है?  [BHU 1999]

(1) + 2

(2) + 3

(3) + 4

(4) + 5

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Select the compound from the following in which oxidation state of oxygen is - 1:-

(1) H2O

(2) O2F2

(3) Na2O

(4) BaO2

निम्नलिखित में से उस यौगिक का चयन कीजिए जिसमें ऑक्सीजन की ऑक्सीकरण अवस्था -1 है: -

(1) H2O

(2) O2F2

(3) Na2O

(4) BaO2

From NCERT

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The oxidation state of Cr in [Cr(NH3)4Cl2]+ is [AIEEE 2005]

(1) +3

(2) +2

(3) +1

(4) 0

[Cr(NH3)4Cl2]+ में Cr की ऑक्सीकरण अवस्था है:         [AIEEE 2005]

(1) +3

(2) +2

(3) +1

(4) 0

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In which of the following compounds, nitrogen exhibits highest oxidation state?

1. N2H                

2. NH3

3. N3H                   

4. NH2OH

निम्नलिखित में से किस यौगिक में नाइट्रोजन उच्चतम ऑक्सीकरण अवस्था को प्रदर्शित करता है?

(1) N2H

(2) NH3

(3) N3H                   

(4) NH2OH

From NCERT

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In the reaction, P+NaOHPH3+NaH2PO2

1. P is oxidized only

2. P is reduced only

3. P is oxidized as well as reduced

4. Na is reduced

अभिक्रिया में, P+NaOHPH3+NaH2PO2

1. P केवल ऑक्सीकृत होता है

2. P केवल अपचयित होता है

3. P ऑक्सीकृत होने के साथ-साथ अपचयित हो जाता है

4. Na अपचयित हो जाता है

 80%
From NCERT

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When a manganous salt is fused with a mixture of KNO3 and solid NaOH, the oxidation number of Mn changes from +2 to :

1. +4

2. +3

3. +6

4. +7

जब एक मैंगनस लवण को KNO3और ठोस NaOH के मिश्रण के साथ संगलित किया जाता है, Mn की ऑक्सीकरण संख्या +2 से बदलकर क्या हो जाती है?

1. +4

2. +3

3. +6

4. +7

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2 gm limestone (CaCO3 + Impurities ) is reacted with 100ml N/2 HCl. The excess acid requires 60ml N/2 NaOH. The % purity of limestone is

1. 25%

2. 50%

3. 75%

4. 100%

2 g चूना पत्थर (CaCO3+ अशुद्धियाँ) को 100ml N/2 HCl के साथ अभिकृत किया जाता है। अतिरिक्त अम्ल को 60ml N/2 NaOH की आवश्यकता होती है। चूना पत्थर की % शुद्धता है-

1. 25%

2. 50%

3. 75%

4. 100%

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The oxidation number of Ba in barium peroxide is :

1. +6

2. +2

3. 1

4. +4

बेरियम परॉक्साइड में Ba की ऑक्सीकरण संख्या है:

1. +6

2. +2

3. 1

4. +4

 59%
From NCERT

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The equivalent mass of H3BO3 (M = Molar mass of H3BO3) in its reaction with NaOH to from Na2B4O7 is equal to –

(1) M

(2) M2

(3) M4

(4) M6

Na2B4O7 से NaOH के साथ अपनी अभिक्रिया में H3BO(M = H3BO3 का मोलर द्रव्यमान) का तुल्यांकी द्रव्यमान किसके बराबर है

(1) M

(2) M2

(3) M4

(4) M6

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Which acts as a reducing agent?

1. HNO3

2. KMnO4

3. H2SO4

4. (COOH)2

कौन एक अपचायक के रूप में कार्य करता है?

(1) HNO3

(2) KMnO4

(3) H2SO4

(4) (COOH)2

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