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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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#### 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.

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#### On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with $H_{2}$ in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :  Option: 1$NaN_{3}$Option: 2$NaN_{3}$Option: 3$Pb(NO_{3})_{2}$Option: 4$Pb(NO_{3})_{2}$Option: 5$(NH_{4})_{2}Cr_{2}O_{7}$Option: 6$(NH_{4})_{2}Cr_{2}O_{7}$Option: 7$NH_{4}NO_{2}$Option: 8$NH_{4}NO_{2}$

Basic gas (C) must be ammonia (NH3). It means (B) gas should be N2 which is formed by the heating of compound (A).

Pb(NO3)2 is not giving Nitrogen gas.

#### The metal mainly used in devising photoelectric cells is :  Option: 1 NaOption: 2 NaOption: 3 LiOption: 4 LiOption: 5 Rb  Option: 6 Rb  Option: 7 CsOption: 8 Cs

Cs used in photoelectric cell as it has least ionization energy.