In the manufacture of safety matches we useA. White phosphorusB. Red phosphorusC. black phosphorusD. Selenium

In the manufacture of safety matches we useA. White phosphorusB. Red p

1.	In the manufacture of safety matches we useA. White phosphorusB. Red phosphorusC. black phosphorusD. Selenium
Answer» Correct Answer - B Red phosphorus is used in safety matches, white phosphorus due to its low ignition temperature is not used.

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Which of the following species contains three bond pairs and one lone pair around the central atom?A. `BF_(3)`B. `NH H_(2)^(-)`C. `PCl_(3)`D. `H_(2)O`
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Reaction of `HNO_(3)` with C,P,S and I respectively giveA. `HIO_(3),H_(2)SO_(4),H_(3)PO_(4)` and `CO_(2)`B. `HIO_(3),H_(2)SO_(4),H_(3)PO_(4)` and `CO_(2)`C. `I_(2)O_(5), H_(2)SO_(4),H_(3)PO_(3)` and COD. `I_(2)O_(5),SO_(2),P_(2)O_(5)` and `CO_(2)`
Assertion : `HNO_(3)` is a stronger acid than `HNO_(2)` Reason: In `HNO_(3)`, there are two nitrogen to oxygen bonds while in `HNO_(2)` there is only one.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is falseC. A is true but R is falseD. A is false but R is true
Group 15 of the periodic table consists of the elements N, P, As, Sb and Bi. On passing from N to Bi, the oxides of the elements of general formula `M_2 O_3` becomeA. Stronger reducing agentsB. more ionicC. more basicD. more volatile
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Which of the following is least basic?A. `NF_(3)`B. `NCl_(3)`C. `NBr_(3)`D. `NI_(3)`
Assertion : Among the hydrides of N-family , `NH_(3)` has highest boiling point . Reason: Extensive H-bonding is present in `NH_(3)` , while other elements of the group can not form H-bonding.A. Both A and R are true and R is the correct explanation of AB. Both A and R are true but R is falseC. A is true but R is falseD. A is false but R is true
In the compounds of the type `POX_3`, P atoms show multiple bonding of the typeA. `p pi , dpi`B. `d pi, dpi `C. `p pi - dpi `D. no multiple bond is present
The decreasing order of the boiling points of the following hydrides (i) `NH_3` (ii) `PH_3` (iii) `AsH_3` (iv) `SbH_3` (v) `H_2O` isA. VgtIVgtIgtIIIgtIIB. VgtIgtIIgtIIIgtIVC. IgtIVgtIIIgtIIgtVD. IVgtIIIgtIgtIIgtV

In the manufacture of safety matches we useA. White phosphorusB. Red phosphorusC. black phosphorusD. Selenium

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