Mansi Behl asked • 8 minutes ago

The reaction of acidified, aqueous potassium iodide with aqueous hydrogen peroxide

is thought to involve the following steps

Which one of the following conclusions cannot be drawn from this information?

is thought to involve the following steps

Which one of the following conclusions cannot be drawn from this information?

- a)The iodide ion is oxidised by the hydrogen peroxide
- b)The acid acts as a catalyst
- c)The rate determining step is

H_{2}O_{2}+ I − → H_{2}O + OI − - d)The rate equation for the reaction is

rate = k [ H^{2}O^{2 }] [ I − ]

Correct answer is option 'B'. Can you explain this answer?

Alok Shukla asked • 11 minutes ago

What is the solubility of solid copper hydroxide at a pH of 8?

Given: Cu(OH)_{2}(s) Cu(OH)_{2}(aq) K_{1}=10^{-6} M

Cu(OH)_{2}(aq) Cu(OH)^{+} + OH^{-} K_{2} = 10^{-7} M

Cu(OH)^{+ } Cu^{+2} + OH^{-} K_{3} = 10^{-4} M

(Assumed no other equilibrium is established)

Mansi Behl asked • 33 minutes ago

In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance P=4 Ω and the neutral point N is at 60 cm from A. Now an unknown resistance R is connected in series to P and the new position of the neutral point is at 80 cm from A. The value of unknown resistance R is :

- a)33/5 Ω
- b)6 Ω
- c)7 Ω
- d)20/3Ω

Correct answer is option 'D'. Can you explain this answer?

Mansi Behl asked • 35 minutes ago

Which of the following is a set

- a)The collection of most difficult topics in Mathematics is a set.
- b)The collection of most talented writers of India is a set.
- c)The collection of good cricket players of India is a set.
- d)A collection of vowels in English alphabets is a set.

Correct answer is option 'D'. Can you explain this answer?

Mansi Behl asked • 1 hour ago

A calorimeter of mass 0.2 kg and specific heat 900 J/kg-K. Containing 0.5 kg of a liquid of specific heat 2400J/kg-K. Its temperature falls from 60ºC to 55ºC in one minute. The rate of cooling is

- a)5 J/s
- b)15 J/s
- c)100 J/s
- d)115 J/s

Correct answer is option 'D'. Can you explain this answer?

Dev Singh asked • 1 hour ago

Find the derivative of m = 13x^{4} + 5x^{3} - 12y^{3} + 24x^{2} + y^{2} - 2x - 156 with respect to x.

- a)dm/dy = 52x
^{3}+ 15x^{2}+ 48x - 2 - b)dm/dy = 52x
^{3}+ 15x^{2}- 36y^{2}+ 48x + 2y - 2 - c)dm/dy = 52x
^{3}+ 15x^{2}- 36y^{2}+ 48x + 2y - 3 - d)dm/dy = -36x
^{3}+ 2y

Correct answer is option 'D'. Can you explain this answer?

Amutha Varshini asked • 1 hour ago

A purse contains 4 copper coins and 3 silver coins, the second purse contains 6 copper coins and 2 silver coins. A coin is taken out from any purse. The probability that it is a copper coin is

- a)4/7
- b)37/56
- c)3/7
- d)3/4

Correct answer is option 'B'. Can you explain this answer?

Mansi Behl asked • 1 hour ago

How many electrons must be removed from each of two 5.0-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?

- a)2.7 x 10
^{9} - b)2.7 x 10
^{10} - c)2.7 x 10
^{11} - d)2.7 x 10
^{12}

Correct answer is option 'A'. Can you explain this answer?

Mansi Behl asked • 1 hour ago

In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which α - hydrogen has been replaced by halogen. This reaction is known as :

- a)Wolff - Kischner reaction
- b)Etard reaction
- c)Hell - Volhard - Zelinsky reaction
- d)Rosenmund reaction

Correct answer is option 'C'. Can you explain this answer?

Avinash Kumar asked • 2 hours ago

Krishan Singh asked • 2 hours ago

- a)2x
^{2}+ 7xy - 11x + 6 = 0 - b)2(x - 1)
^{ 2}+ 7(x - 1)(y - 1) - 3y^{2}= 0 - c)2(x - 1)
^{ 2}+ 7(x - 1)(y - 1) - 3(y - 1)^{ 2 }= 0 - d)none of the above

Correct answer is option 'D'. Can you explain this answer?

Mansi Behl asked • 2 hours ago

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion(A):

Reason(R):

Assertion(A):

Reason(R):

- a)Both Assertion and Reason are true and Reason is the correct explanation of assertion.
- b)Both Assertion and Reason are true and Reason is not the correct explanation of assertion.
- c)Assertion is true but Reason is false.
- d)Assertion is false but Reason is true.

Correct answer is option 'D'. Can you explain this answer?

Neha Qureshi asked • 3 hours ago

- a)-1
- b)-3
- c)2
- d)1

Correct answer is option 'C'. Can you explain this answer?

Mansi Behl asked • 3 hours ago

Which of these statements is not true?

- a)In aqueous solution, the T1
^{+}ion is much more stable than T1 (III) - b)LiAlH
_{4}is a versatile reducing agent in organic synthesis. - c)NO
^{+}is not isoelectronic with O_{2} - d)B is always covalent in its compounds

Correct answer is option 'D'. Can you explain this answer?

Mansi Behl asked • 3 hours ago

Diameter of a steel ball is measured using a Vernier callipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its vernier scale (VS) match 9 divisions on the main scale. Three such measurements for a ball are given as :

If the zero error is -0.03cm, then mean corrected diameter is :

If the zero error is -0.03cm, then mean corrected diameter is :

- a)0.56 cm
- b)0.59 cm
- c)0.53 cm
- d)0.52 cm

Correct answer is option 'B'. Can you explain this answer?

Ram Mohith asked • 3 hours ago

For r = 0, 1, ...., 10 let A_{r}, B_{r}, C_{r} denote, respectively, the coefficient of x^{r} in the expansions of (1 + x)^{10}, (1 + x)^{20} and (1 + x)^{30}. Then is equal to [JEE 2010]

- a)B
_{10}- C_{10} - b)
- c)0
- d)C
_{10}- B_{10}

Correct answer is option 'D'. Can you explain this answer?

Mursleen Chauhan Chauhan asked • 4 hours ago

A body of mass m is taken from earth surface to the height h equal to radius of earth, the increase in potential energy will be [NCERT 1971; CPMT 1971, 97; IIT 1983; CBSE PMT 1991; Kurukshetra CEE 1996; CMEET Bihar 1995; MNR 1998; AIEEE 2004]

- a)mgR
- b)(1/2)mgR
- c)2 mgR
- d)(1/4)mgR

Correct answer is option 'B'. Can you explain this answer?

Vikas Saini asked • 4 hours ago

There are n_{1} photons of frequency γ_{1} in a beam of light. In an equally energetic beam, there are n_{2} photons of frequency γ_{2}. Then the correct relation is [KCET 2003]

- a)n
_{1}/n_{2}=1 - b)n
_{1}/n_{2}=γ_{1}/γ_{2} - c)n
_{1}/n_{2}=γ_{2}/γ_{1} - d)n
_{1}/n_{2}=γ_{1}^{2}/γ_{2}^{2}

Correct answer is option 'C'. Can you explain this answer?

Jenita Prince asked • 4 hours ago

- a)All stars move from east to west
- b)The earth rotates from west to east
- c)The earth rotates from east to west
- d)The background of the stars moves from west to east

Correct answer is option 'B'. Can you explain this answer?

Aman Kumar asked • 4 hours ago

Sanika Shaikh Shaikh asked • 4 hours ago

choices (a), (b), (c) and (d), out of which ONE or MORE THANT ONE is correct.

- a)Gauche only
- b)Gauche
- c)Anti
- d)Eclipsed

Correct answer is option 'B,C'. Can you explain this answer?

Pradeep Ahen asked • 4 hours ago

The n rows each containing m cells in series are joined in parallel. Maximum current is taken from this combination across an external resistance of 3Ω resistance. If the total number of cells used are 24 and internal resistance of each cell is 0.5 Ω then

- a)m=8,n=3
- b)m=6,n=4
- c)m=12,n=2
- d)m=2,n=12

Correct answer is option 'C'. Can you explain this answer?

pooja pooja asked • 5 hours ago

A light disc made of aluminium (a non magnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale).

- a)Rotate in the direction opposite to the direction of magnet’s motion
- b)Rotate in the same direction as the direction of magnet’s motion
- c)Not rotate and its temperature will remain unchanged
- d)Not rotate but its temperature will slowly rise

Correct answer is option 'B'. Can you explain this answer?

Shrutika Karpe asked • 6 hours ago

A source of sound moves along a circle of radius 2 m with constant angular velocity 40 rad/s. Frequency of the source is 300 Hz. A detector is kept at some distance from the circle in the same plane of the circle (as shown in figure). Which of the following is not the possible value of frequency registered by the detector? (Speed of sound = 320 m/s)

- a)250 Hz
- b)360 Hz
- c)410 Hz
- d)220 Hz

Correct answer is option 'C,D'. Can you explain this answer?

Mansi Behl asked • 6 hours ago

Two wires W_{1} and W_{2} have the same radius r and respective densities ρ_{1} and ρ_{2} such that ρ_{2}=4ρ_{1}. They are joined together at the point O, as shown in the figure. The combination is used as a sonometer wire and kept under tension T.The point O is midway between the two bridges. When a stationary wave is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in W_{1} to W_{2} is :

- a)1:1
- b)1:2
- c)1:3
- d)4:1

Correct answer is option 'A'. Can you explain this answer?

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