94420 + Interview Questions in Chemistry in Class 12

1.	Phosphoric acid (H_(3)PO_(4)) is tribasic acid and one of its salt is sodium dihydrogen phosphate (NaH_(2)PO_(4)). What volume of 1 M NaOH solution should be added to 12 g of sodium dihydrogen phosphate (mol. Wt. 120) to exactly convert it into trisodium phosphate Na_(3)PO_(4)
Answer» 80 ml 100 ml 200 ml 300 ml Solution :`1xxV=(12)/(120)xx2=200ml`

Discussion

2.	Phospholipids are the esters of glycerol with
Answer» THREE phosphate groups Three carboxylic ACID residues TWO carboxylic acid residues and one phosphate group One carboxylic acid residues and two phophate groups Answer :C

Discussion

3.	Phosphodiester linkage present between
Answer» 1 and 2 carbon atoms of TWO pentose sugar 3 and 5 carbon atoms of two pentose sugar 2 and 3 carbon atoms of two pentose sugar 1 and 3 carbon atoms of two pentose sugar Answer :B

Discussion

4.	Phosphine is produced by adding water to:
Answer» `CaC_2` `HPO_3` `Ca_3P_2` `P_4O_10` ANSWER :C

Discussion

5.	Phospholipids are esters of glycerol with
Answer» three carboxylic ACID residues TWO carboxylic acid residues and ONE phosphate GROUP one carboxylic acid residues and one phosphate group three phosphate group Answer :B

Discussion

6.	Phosphine (PH_(3)) decomposes to produce vapours of phosphorus and H_(2) gas. What will be the change in volume when 100mL of phosphine is decomposed?
Answer» `+50mL` `500mL` `+75ML` `-500mL` Solution :`4PH_(3)(g)rarrP_(4)(g)+6H_(@)(g)` `4mLrarr1mL 6mL` `100mLrarr(100)/(4) (6)/(4)XX100` `100mAL rarr25mL 150mL` VOLUME INCREASES by 75 mL.

Discussion

7.	Phosphine prepared by the action of caustic soda on white phophorus is highly inflammable because it contains small amounts of :
Answer» hydrogen vapour of WHITE PHOSPHORUS vapour of phosphorus trioxide Phosphorus dihydride. Answer :D

Discussion

8.	Phosphine reacts with copper sulphate solution to form:
Answer» Copper Copper phosphide Copper phosphate Copper phosphite Answer :B

Discussion

9.	Phosphine on reaction with hydrobromic acid gives:
Answer» `PBr_3` `PH_4Br` `PBr_5` `P_2H_4` ANSWER :B

Discussion

10.	Phosphine is prepared in the laboratory by the reaction of
Answer» P and `H_(2)SO_(4)` P and NaOH P and `H_(2)S` P and `HNO_(3)` Solution :`underset("(WHITE)")(P_(4))+3NaOH +3H_(2)O to underset("phosphine")(PH_(3))+ underset("Sod. Hypophosphite")(3NaH_(2)PO_(2))`

Discussion

11.	Phosphine is …………….smelling gas.
Answer» SOLUTION :ROTTEN FISH

Discussion

12.	Phosphine is not obtained by which of the following reaction?
Answer» <P>White P is heated WITCH conc. NAOH in an INERT atmosphere of `CO_2` Calcium phosphide TREATED with water Phosphonium iodide treated with KOH `PCl_5` treated with water Answer :D

Discussion

13.	Phosphine is not obtained by the reaction when
Answer» white P is HEATED with NaOH RED P is heated with NaOH `Ca_(3)P_(2)` REACTS with water `P_(4)O_(6)` is boiled with water. Solution :Red P does not REACT with `NaOH`. Only white P reacts with `NaOH` or `KOH` to form `PH_3`.

Discussion

14.	Phosphine is not obtained by the reaction:
Answer» White P is HEATED with NAOH Red P is heated with NaOH `Ca_3P_2` reacts with dilute HCl Phosphorus trioxide is BOILED with water Answer :B

Discussion

15.	Phosphine is generally prepared in the laboratory:
Answer» By heating phosphorus in a current of hydrogen By heating white phosphorus with aqueous solution of CAUSTIC potash By decomposition of `P_2H_4` at `110^@` C By heating RED phosphorus with an aqueous solution of caustic soda Answer :B

Discussion

16.	Phosphine is not evolved when:
Answer» WHITE phosphorus is boiled with a STRONG SOLUTION of `BA(OH)_2` Phosphorus acid is heated Calcium hypophosphite is heated Metaphosphoric acid is heated Answer :D

Discussion

17.	Phosphine is not obtaind by the reaction when :
Answer» <P>white P is HEATED with NaOH red P is heated with NaOH `Ca_3P_2` reacts with WATER phosphaorus trioxide is boilied with water. Answer :B

Discussion

18.	Phosphine is not collected in air because:
Answer» It is poisonous It ABSORBS moisture It CATCHES FIRE SPONTANEOUSLY in air It is combustible Answer :C

Discussion

19.	Phosphine is:
Answer» Basic Acidic Amphoteric Neutral Answer :A

Discussion

20.	Phosphine gives black precipitate with
Answer» NaCl `Cl_(2)` `AlCl_(3)` `CuSO_(4)` ANSWER :D

Discussion

21.	Phosphine has a …………….shape.
Answer» SOLUTION :PYRAMIDAL

Discussion

22.	Phosphine gas gives explosion on contact with ..........
Answer» HYDROLYTIC AGENT Reducing agent Oxidizing agent NONE of the above Answer :C

Discussion

23.	Phosphine explodes in presence of...........
Answer» `HNO_(3)`<BR>`Cl_(2)` `Br_(2)` All of these Answer :D

Discussion

24.	Phosphine can be prepared by the reaction of water with :
Answer» CALCIUM phophide calcium HYDRIDE calcium DIHYDROGEN PHOSPHATE calcium phosphate ANSWER :A

Discussion

25.	Phosphide ion has the electronic structure similar to that of:
Answer» NITRIDE ion Chloride ion Fluroide ion Sodium ion Answer :B

Discussion

26.	Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes
Answer» enhanced GROWTH of ALGAE decrease in amount of dissolved oxygen in water deposition of calcium phosphate increase in fish population. Solution : Phosphate CONTAINING FERTILISERS SUPPORT dense growth of plants and algae and decrease the amount of dissolved oxygen.

Discussion

27.	Phosphate mineral of phosphorus is:
Answer» `Fe_3(PO_4)_2H_2O` `Ca_3(PO_4)_2` `3Ca_3 (PO_4)_2.CaF_2` `3Ca_3 (PO_4)_2.CaCl_2` ANSWER :B

Discussion

28.	Phosphate + conc. HNO_3 + (NH_4)_2MoO_4solution rarr Yellow precipitate The composition of yellow precipitate is:
Answer» `(NH_4)_3PO_4. MoO_3` `(NH_4)_3PO_4 .12MoO_3` `(NH_4)_2PO_4. 12MoO_3` `NH_4PO_4. MoO_3` ANSWER :B

Discussion

29.	Phosgene is the name of:
Answer» A PHOSPHORUS compound A PHOSPHONIUM compound Carbonyl chloride Phosphorus halide Answer :C

Discussion

30.	Phosgene is the common name of
Answer» CARBONYL chloride Phosphine Phosphorus oxychloride phosphorus trichloride Solution :`CHCl_(3) +1/2 O_2 to underset("PHOSGENE or carbonyl")underset("Chloride")(COCl_(2) +HCl)`

Discussion

31.	Phosgene is the common name for :
Answer» `CO_(2) and PH_(3)` Phosphoryl CHLORIDE Carbonyl chloride Carbon TETRACHLORIDE ANSWER :3

Discussion

32.	Phosgene is :
Answer» `CHCl_(3)` `CF_(2)Cl_(2)` `COCl_(2)` `CHI_(3)` Answer :C

Discussion

33.	phosgene is a common name for :
Answer» `CO_2` and `PH_3` PHOSPHORYL chloride Carbonyl chloride Carbon tetrachloride Answer :C

Discussion

34.	Phosgene is
Answer» `PH_(3)` `PCl_(2)` `COCl_(2)` `SCl_(2)` ANSWER :C

Discussion

35.	Phorone is obtained by condensation of:
Answer» TWO molecules of acetaldehyde Two molecules of acetone Two molecules of `CH_3 CHO` + ONE molecule of `CH_3COCH_3` 3 molecules of acetone Answer :D

Discussion

36.	Philosopher"s wool when heated with BaO at 1100@C gives the compound:
Answer» `BaZnO_2` BA + `ZnO_2~ `BaCdO_2` `BaO_3` + Zn Answer :A

Discussion

37.	Phophorus exists in the following alloptropic forms except:
Answer» WHITE phosphorus blue PHOSPORUS RED phosphorus black phosphorus. Answer :B

Discussion

38.	PhN_(2)^(+)BF_(4)^(-) overset(PhNO_(2))underset(Delta) to A If the molecular weight of product A is x, x/4?
Answer» Solution :`PhN_(2)BF_(2) underset(DELTA)to Ph^(+) + N_(2) +BF_(4)^(-)` x = 198 x/4 = 49.5

Discussion

39.	phNH_(2) and PhNHMe can be differentiated by :
Answer» `CHCL_(3)+ KOH` `NaNO_(2)+HCL` `PhSO_(2)CL `followed by KOH all of these Solution :N//A

Discussion

40.	PhMgBroverset(CO_(2))underset(H^(oplus)//HOH)rarroverset(SOCl_(2))rarroverset(CH_(2)N_(2))rarroverset(Ag_(2)O)underset(H_(2)O)rarr
Answer» ANSWER :B::C

Discussion

41.	PhMe+(A)overset(AlCl_(3))to p-MeC_(6)H_(4)-CO-CH_(2)-CH_(2)COOHoverset(Zn//Hg//HCl)to(B)
Answer» ANSWER :A::B::C::D

Discussion

42.	Philospher's woold is the anme given to the compound"…................".
Answer» ANSWER :ZINC OXIDE

Discussion

43.	Philosopher's wool when heated with BaO at 1100^@C gives the compound:
Answer» `BaZnO_2` BA + `ZNO2 `BaCdO_2` `BaO_3` + Zn Answer :A

Discussion

44.	Philosopher's wool when heated with BaO at 1100^@C gives compound. Identify the compound
Answer» `BaZnO_(2)` `Ba+ ZnO_(2)` `BaCdO_(2)` `BaO_(2) + Zn ` Solution :`ZnO + BaO OVERSET(1100^(@)C)toBaZnO_(2)`

Discussion

45.	Philosopher's wool when heated with BaO at 100^(@)C gives the compounds:
Answer» `BaCdO_(2)` `Ba+ZnO_(2)` `BaO_(2)+ZN` `BaZnO_(2)` ANSWER :D

Discussion

46.	phi-CH_(2)-underset(O)underset(\|\|)C-OH underset(Delta)overset(NaOH+CaO)rarr phi-CH_(3) Order of rate if phi is :
Answer» `P GT Q gt S gt R` `R gt S gt Q gt P` `P gt Q gt R gt S` `Q gt R gt S gt P` Solution :BASED on stability of CARBANION.

Discussion

47.	Pheromones are compounds secreted by the females of many insect species to attract males. One of these compounds contains 80.78% C, 13.56% H, and 5.66% O. A solution of 1.0g of this substance in 8.50"cc" of benzene freezes at 3.37^(@)C. What are the molecular weight and molecular formula of the compound ? (f.p. of C_(6)H_(6)=5.5^(@)C, K_(f)(C_(6)H_(6))=5.12^(@)C//m)
Answer» ANSWER :`282`, `C_(19)H_(38)O`

Discussion

48.	Phhotographicplatesare coated withh a film of
Answer» SILVER chloride Silver bromide Silver iodide Silver oxide Answer :B

Discussion

49.	Phenylmethyl ketone can be converted into ethylbenzene in one step by which of the following reagents?
Answer» `LiAlH_4` Zn-Hg/HCl `NaBH_4` `CH_3MgI` SOLUTION : This REACTION is KNOWN as CLEMMENSEN's reaction

Discussion

50.	Pheromones are chemicals
Answer» FORMED by fermentation process of fungi SECRETED by endocrine GLANDS of man Secreted outside the body of insects Plant GROWTH hormones Solution :Pheromones are chemical secreted outside the body of the insects.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Phosphoric acid (H_(3)PO_(4)) is tribasic acid and one of its salt is sodium dihydrogen phosphate (NaH_(2)PO_(4)). What volume of 1 M NaOH solution should be added to 12 g of sodium dihydrogen phosphate (mol. Wt. 120) to exactly convert it into trisodium phosphate Na_(3)PO_(4)

Phospholipids are the esters of glycerol with

Phosphodiester linkage present between

Phosphine is produced by adding water to:

Phospholipids are esters of glycerol with

Phosphine (PH_(3)) decomposes to produce vapours of phosphorus and H_(2) gas. What will be the change in volume when 100mL of phosphine is decomposed?

Phosphine prepared by the action of caustic soda on white phophorus is highly inflammable because it contains small amounts of :

Phosphine reacts with copper sulphate solution to form:

Phosphine on reaction with hydrobromic acid gives:

Phosphine is prepared in the laboratory by the reaction of

Phosphine is …………….smelling gas.

Phosphine is not obtained by which of the following reaction?

Phosphine is not obtained by the reaction when

Phosphine is not obtained by the reaction:

Phosphine is generally prepared in the laboratory:

Phosphine is not evolved when:

Phosphine is not obtaind by the reaction when :

Phosphine is not collected in air because:

Phosphine is:

Phosphine gives black precipitate with

Phosphine has a …………….shape.

Phosphine gas gives explosion on contact with ..........

Phosphine explodes in presence of...........

Phosphine can be prepared by the reaction of water with :

Phosphide ion has the electronic structure similar to that of:

Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes

Phosphate mineral of phosphorus is:

Phosphate + conc. HNO_3 + (NH_4)_2MoO_4solution rarr Yellow precipitate The composition of yellow precipitate is:

Phosgene is the name of:

Phosgene is the common name of

Phosgene is the common name for :

Phosgene is :

phosgene is a common name for :

Phosgene is

Phorone is obtained by condensation of:

Philosopher"s wool when heated with BaO at 1100@C gives the compound:

Phophorus exists in the following alloptropic forms except:

PhN_(2)^(+)BF_(4)^(-) overset(PhNO_(2))underset(Delta) to A If the molecular weight of product A is x, x/4?

phNH_(2) and PhNHMe can be differentiated by :

PhMgBroverset(CO_(2))underset(H^(oplus)//HOH)rarroverset(SOCl_(2))rarroverset(CH_(2)N_(2))rarroverset(Ag_(2)O)underset(H_(2)O)rarr

PhMe+(A)overset(AlCl_(3))to p-MeC_(6)H_(4)-CO-CH_(2)-CH_(2)COOHoverset(Zn//Hg//HCl)to(B)

Philospher's woold is the anme given to the compound"…................".

Philosopher's wool when heated with BaO at 1100^@C gives the compound:

Philosopher's wool when heated with BaO at 1100^@C gives compound. Identify the compound

Philosopher's wool when heated with BaO at 100^(@)C gives the compounds:

phi-CH_(2)-underset(O)underset(||)C-OH underset(Delta)overset(NaOH+CaO)rarr phi-CH_(3) Order of rate if phi is :

Phhotographicplatesare coated withh a film of

Phenylmethyl ketone can be converted into ethylbenzene in one step by which of the following reagents?

Pheromones are chemicals