Which one of the following represents 180 g of water ?

(a)

5 Moles of water

(b)

90 moles of water

(c)

\(\frac { 6.022\times { 10 }^{ 23 } }{ 180 } \) molecules of water 

(d)

6.022\(\times\)10²⁴molecules of water

If n = 6, the correct sequence for filling of electrons will be __________

(a)

ns \(\rightarrow\) (n-2)f \(\rightarrow\) (n - 1)d \(\rightarrow\) np

(b)

ns \(\rightarrow\) (n - 1) d \(\rightarrow\) (n - 2) f \(\rightarrow\) np

(c)

ns \(\rightarrow\) (n-2)f \(\rightarrow\)np \(\rightarrow\) (n-1)d

(d)

none of these are correct

The electronic configuration of the atom having maximum difference in first and second ionisation energies is _________

(a)

1s², 2s², 2p⁶, 3s¹

(b)

1s², 2s², 2p⁶, 3s²

(c)

1s², 2s², 2p⁶, 3s², 3s², 3p⁶, 4s¹

(d)

1s², 2s², 2p⁶, 3s², 3p¹

In case of alkali metal halides, the ionic character increases in the order ____________

(a)

MF < MCI < MBr < MI

(b)

MI < MBr < MCI < MF

(c)

MI < MBr

(d)

none of these

The value of universal gas constant depends upon __________

(a)

Temperature of the gas

(b)

Volume of the gas

(c)

Number of moles of the gas

(d)

units of Pressure and volume.

Change in internal energy, when 4 kJ of work is done on the system and 1 kJ of heat is given out by the system is ______________

(a)

+1 kJ

(b)

- 5 kJ

(c)

+3 kJ

(d)

- 3 kJ

An equilibrium constant of 3.2\(\times\)10^–6 for a reaction means, the equilibrium is _____________

(a)

largely towards forward direction

(b)

largely towards reverse direction

(c)

never established

(d)

none of these

At 100^o C the vapour pressure of a solution containing 6.5g a solute in 100g water is 732mm. If K_b = 0.52, the boiling point of this solution will be __________

(a)

102^oC

(b)

100^oC

(c)

101^oC

(d)

100.52^oC

Pick out the incorrect statement from the following.

(a)

Sp³ hybrid orbitals are equivalent and are at an angle of 109^o 28' with each other

(b)

dsp² hybrid orbitals are equivalent and bond angle between any two of them is 90^o

(c)

All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of 120^o, remainir two are perpendicular to the plane containing the other three

(d)

none of these

The IUPAC name of the compound \({ H }_{ 3 }C-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -CH=C{ \left( { CH }_{ 3 } \right) }_{ 2 }\) is _____________

(a)

2,4,4 – Trimethylpent -2-ene

(b)

2,4,4 – Trimethylpent -3-ene

(c)

2,2,4 – Trimethylpent -3-ene

(d)

2,2,4 – Trimethylpent -2-ene

Which of the group has highest +I effect ?

(a)

CH₃^-

(b)

CH₃ - CH₂ -

(c)

(CH₃)₂ - CH-

(d)

(CH₃)₃ - C-

In the following reaction,

The major product obtained is ________

(a)

(b)

(c)

(d)

(a)

(b)

(c)

both (a) and (b)

(d)

             Cl
                           |

The treatment of ethyl formate with excess of RMgX gives ____________

(a)

\(R-\underset { \overset { || }{ O } }{ C } -R\)

(b)

\(R-\underset { \overset { | }{ OH } }{ CH } \quad R\)

(c)

R- CHO

(d)

R- O- R

Assertion (A) : Oxygen plays a key role in the troposphere
Reason (R) : Troposphere is not responsible for all biological activities
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct