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151.

The volume strength of `10 NH_(2)O_(2)` is :A. 112B. 11.2C. 0.112D. 56

Answer» Correct Answer - D
Discussion
152.

Among `CaH_(2),NH_(3),` and `B_(2)H_(6)` which are covalent hydrides?A. `NH_(3)` and `B_(2)H_(6)`B. `NaH` and `CaH_(2)`C. `NaH`and `NH_(3)`D. `CaH_(2)` and `B_(2)H_(6)`

Answer» Correct Answer - A
Discussion
153.

Which of the following statements are correct regarding hydrogen? (i) The largest single use of dihydrogen is in the synthesis of `NH_(3)` which is used in the manufacture of `HNO_(3)` and nitrogenous fertilizers. (ii) It is used to reduce heavy metal oxide (iii) It is used as rocket fuel. (iv) Atomic hydrogen and oxy hydrogen torches find use for cutting and welded to purpose.A. i,iiiB. i,iiC. i,ii,ivD. i,ii,iii,iv

Answer» Correct Answer - D
Discussion
154.

`xCr^(+3) + yH_(2)O_(2)+mOH^(-)rarr zCO_(4)^(-2) +nH_(2)O` In the above balance the equation , what is the value of x+y+z is :

Answer» Correct Answer - 7
Discussion
155.

What is (X) and (Y) in the above reaction?A. `RCH_(2)CH_(2)CHO,RCH_(2)CH_(2)CH_(2)OH`B. `RCH_(2)CH_(2)CHO,RCH_(2)CH_(2)OH`C. `CH_(3)CH_(2)CHO,CH_(3)CH_(3)OH`D. `CH_(3)CH_(2)CH_(2)CHO,CH_(3)CH_(2)CH_(2)OH`

Answer» Correct Answer - A
Discussion
156.

The number of species having peroxy bonds among the following Pertitanic acid , `Na_(2)O_(2), PbO_(2) , CrO_(5)` Perchloric cid, Potassium permanganate

Answer» Correct Answer - 3
Discussion
157.

A 5.0 mL solution of `H_(2)O_(2)` liberates 1.27 g of iodine from an acidified KI solution. The percentage strenth of `H_(2)O_(2)` isA. 5.6B. 1.7C. 3.4D. 11.2

Answer» Correct Answer - C
Discussion
158.

Sample of water has hardness 77.5ppm `Ca^(2+)`. If this is passed through an ion exchange column where `Ca^(2+)` is replaced by `H^(+)`, what is the pH of water after it has been so treatedA. 1.4B. 4.4C. 2.4D. 5.4

Answer» Correct Answer - C
Discussion
159.

`H_(2)O_(2)` is an unstable liquid . On standing or on heating it decomposes to `H_(2)O` and `O_(2) . H_(2)O_(2)` can acts as oxidising agent and reducing agent . The concentration of `H_(2)O_(2)` is expressed differently with volume strength and the concentration of `H_(2)O_(2)` at a particular time is measured by titrating it with acidified `KMnO_(4)` or by titrating liberated `I_(2)` from acidified KI and `H_(2)O_(2)` with hypo solution . A sample of `H_(2)O_(2)` has 3.4 g of `H_(2)O_(2)` in 100 mL solution . The bottle containing this sample was kept at `25^(0)C` for 15 days then 20mL of this sample is treated with excess KI and the liberated iodine requires 50 mL , 0.2 M `Na_(2)S_(2)O_(3)` solution . Assume the volume of solution remains unchanged . The volume of `H_(2)O_(2)` sample (after 15 days ) that is required to reduce 40 mL of `0.2` M acidified `KMnO_(4)` solution is :A. 40 mLB. 200 mLC. 80 mLD. 100 mL

Answer» Correct Answer - C
Discussion
160.

`H_(2)O_(2)` is an unstable liquid . On standing or on heating it decomposes to `H_(2)O` and `O_(2) . H_(2)O_(2)` can acts as oxidising agent and reducing agent . The concentration of `H_(2)O_(2)` is expressed differently with volume strength and the concentration of `H_(2)O_(2)` at a particular time is measured by titrating it with acidified `KMnO_(4)` or by titrating liberated `I_(2)` from acidified KI and `H_(2)O_(2)` with hypo solution . A sample of `H_(2)O_(2)` has 3.4 g of `H_(2)O_(2)` in 100 mL solution . The bottle containing this sample was kept at `25^(0)C` for 15 days then 20mL of this sample is treated with excess KI and the liberated iodine requires 50 mL , 0.2 M `Na_(2)S_(2)O_(3)` solution . Assume the volume of solution remains unchanged . `The volume strength of `H_(2)O_(2)` in the begining and after 15 days areA. `5.6 , 3.4`B. `11.2 , 2.8`C. `5.6 , 4.6`D. `11.2 , 5.6`

Answer» Correct Answer - B
Discussion
161.

In which of the following reactions, `H_(2)O_(2)` act as a reducing agent ?A. `PbO_(2(s))+H_(2)O_(2(aq))rarrPbO_((s))+H_(2)O_((1))+O_(2(g))`B. `PbO_(2(s))+H_(2)O_(2(aq))rarrPbO_((s))+H_(2)O_((1))+O_(2(g))`C. `2KI_((aq))+H_(2)O_(2(aq))rarr2KOH_((aq))+I_(2(s))`D. All the above

Answer» Correct Answer - A
Discussion
162.

In which of the following reactions, `H_(2)O_(2)` act as a reducing agent ?A. `PbS_((s))+4H_(4)O_(2(aq))overset(H^(+))rarrPbSO_(4(s))+H_(2)O(l)`B. `HOCl+H_(2)O_(2)overset(H^(+))rarrH_(3)O^(+)+Cl^(-1)+O_(2)`C. `Mn^(2+)+H_(2)O_(2)overset(OH^(-))rarrMn^(4+)+2OH^(-)`D. `Fe^(2+)+H_(2)O_(2)overset(OH^(-))rarr2Fe^(3+)+2OH^(-)`

Answer» Correct Answer - B
Discussion
163.

Study the following reaction carefully I. `HOCl+ H_(2)O_(2) to H_(3)O^(+) Cl^(-)+ O_(2)` II. `PbS+ 4 H_(2) O_(2) to PsSO_(4)+ 4 H_(2)O` Point out the correct option.A. In (I), HOCl is sreduced and in (II) PbS is oxidesedB. In (I), HOCl is oxidised and (II) PbS is reducedC. In both (I) and (II), HOCl and PbS are reducedD. In both (I) and (II), HOCl and PbS are oxidised

Answer» Correct Answer - A
Discussion
164.

Tritium emitsA. a-particleB. PositronC. b-particleD. Neutron

Answer» Correct Answer - D
Discussion
165.

Radioactive elements emit `alpha, beta and gamma` rays and are characterised by their half-lives. The radioactive isotope of hydrogen isA. ProtiumB. TritiumC. DeuteriumD. Proton

Answer» Correct Answer - B
Discussion