The condition(s) required to maximize the yield of ammonia in Haber process is/are-
 
1. High pressure (200 atm) condition
2. High temperature of 700 K
3. Use of a catalyst such as iron oxide mixed with small amounts of K2O and Al2O3
4. All of the above

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Consider the following reaction,

Cu2+(aq)   + NH3(aq) → X(aq)

The product X is-

1. \([Cu(NH_3)_4(H_2O)_{2}]^{2+}\)
2. \([Cu(NH_3)_2]^{2+}\)
3. \(Cu(NH_3)_{3}\)
4. \([Cu(NH_3)_4]^{2+}\)
Subtopic:  Group 15 - Preparation, Properties & Uses |
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 The covalency of nitrogen in N2O5 is-
1. 4
2. 3
3. 2
4. 5
Subtopic:  Group 15 - Preparation, Properties & Uses |
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Given below are two statements: 
 
Assertion (A): Bond angle in PH4is higher than that in PH3
Reason (R): Lone pair-bond pair repulsion is stronger in PH3 than bond pair-bond pair repulsion in PH4+ .

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Group 15 - Preparation, Properties & Uses |
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 When white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO2 , the product(s) obtained is/are-
1. \( PH_3\)
2. \(NaH_2PO_2\)
3. P2O
4. Both 1 and 2
 
Subtopic:  Group 15 - Preparation, Properties & Uses |
 81%
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Given below are two statements: 
Assertion (A): When PCl5 is heated then PCl3 and Cl2 are obtained as products.
Reason (R): PCl5 gives POCl3 with water.
 
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
 
 
Subtopic:  Group 15 - Preparation, Properties & Uses |
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Consider the following reaction:
PCl5  + H2O   →  A + 2HCl
The product A is -
1. H3PO2
2. H3PO4
3. POCl3
4. None of the above

Subtopic:  Group 15 - Preparation, Properties & Uses |
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The basicity of H3PO4 is-

1. Dibasic
2. Tribasic
3. Monobasic
3. Cannot predict
Subtopic:  Group 15 - Preparation, Properties & Uses |
 86%
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Consider the following equation,

H3PO3   \(\xrightarrow[]{\Delta }\) X  +  Y

The products X and Y are respectively -

1. H3PO2 ; PH3
2. H3PO4 ;  PH3
3. H3PO4 ; H3PO2
4. None of the above
Subtopic:  Group 16 - Preparation, Properties & Uses |
 65%
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The important source(s) of sulphur among the following is/are:
1. Gypsum
2. Epsom salt
3. Galena
4. All of the above
Subtopic:  Group 16 - Preparation, Properties & Uses |
 85%
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