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#### The major product obtained in the following reaction is :  Option: 1 Option: 2 Option: 3  Option: 4

The major product is represented by the option (D). DIBAL−H reduces esters to aldehydes. It also reduces carboxylic acids to aldehydes.

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#### A plane is inclined at an angle with respect to the horizontal. A particle is projected with a speed from the base of the plane , making an angle With respect to the plane as shown in the  figure . The distance from the base ,at which the particle hits the plane is close to:Option: 1Option: 2Option: 3Option: 4

As we know on inclined plane the range is given by

#### The dimension of stopping potential  in photoelectric effect in units of Planck's constant 'h', speed of light 'c' and Gravitational constant 'G' and ampere A is :    Option: 1   Option: 2  Option: 3    Option: 4

Let

Now,

So,

From here we will get: p-q=1---------(1)

2p+3q+r=2----------(2)

-p-2q-r=-3----------(3)

s=-1-----------(4)

From equation 1, 2,3 and 4 we will get: p=0,q=-1, r=5 and s=-1

So,

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#### Mischmetal is an alloy consisting mainly of :Option: 1 lanthanoid metalsOption: 2 actionoid and transition metalsOption: 3 Lanthanoid and actionoid metalsOption: 4 actionoid metals

Mischmetal is an alloy of lanthanoid metals with Fe.

It consists of a lanthanoid metal (~95%) and iron (~5%) and traces of S, C, Ca, and Al.

Therefore, the correct option is (1).

#### The incorrect statement(s) among (a)-(c) is (are): (a) W(VI) is more stable than Cr(VI) (b) in the presence of HCl, permaganate titrations provide satisfactory results. (c) some lanthnoid oxides can be used as phosphorousOption: 1 (b) and (c) onlyOption: 2 (a) and (b) onlyOption: 3 (b) onlyOption: 4 (a) only

(a) W(VI) is more stable than Cr(VI). It is true and given in NCERT.

(b) in the presence of HCl permanganate titrations provide satisfactory results. It is incorrect.

Permanganate titrations in presence of hydrochloric acid are unsatisfactory since hydrochloric acid is oxidised to chlorine.

(c) Some individual Ln oxides are used as phosphors in television screens and similar fluorescing surfaces.

So,(b) is incorrect.

Therefore, the correct option is (3).

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#### The number of chiral carbons present in the molecule given below is __________. Option: 1 5Option: 2 5Option: 3 -Option: 4 -Option: 5 -Option: 6 -Option: 7 -Option: 8 -

Total chiral carbon = 5

#### Which one of the following graphs is not correct for ideal gas ? d = Density, P = Pressure, T = Temperature  Option: 1 IOption: 2 IOption: 3 IIOption: 4 IIOption: 5 IVOption: 6 IVOption: 7 IIIOption: 8 III

For ideal Gas

$\mathrm{d}=\frac{\mathrm{P} \times \mathrm{M}}{\mathrm{RT}}$

‘II’ Graph is incorrect.

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#### If AB4 molecules is a polar molecule, a possible geometry of AB4 is :Option: 1 Square pyramidalOption: 2 Square pyramidalOption: 3 TetrahedralOption: 4 TetrahedralOption: 5 Rectangular planarOption: 6 Rectangular planarOption: 7 Square planarOption: 8 Square planar

(1) If AB4 molecule is a square pyramidal then it has one lone pair and their structure should be

and it should be polar because dipole moment of lone pair of 'A' never be cancelled by others.

(2) If AB4 molecule is a tetrahedral then it has no lone pair and their structure should be

and it should be non polar due to perfect symmetry.

(3) If AB4 molecule is a rectangular planar then

it should be non-polar because the vector sum of dipole moment is zero.

(4) If AB4 molecule is a square planar then

it should be non-polar because the vector sum of the dipole moment is zero.

#### Which of the following is used for the preparation of colloids ?Option: 1 Ostwald ProcessOption: 2 Ostwald ProcessOption: 3 Van Arkel MethodOption: 4 Van Arkel MethodOption: 5 Bredig's Arc Method  Option: 6 Bredig's Arc Method  Option: 7 Mond ProcessOption: 8 Mond Process

Bredig's Arc method is used to form metal colloids.