Chemical Reactivity (Group 1)

Q. Calcium carbids reacts with nitrogen to form a black mixture of carbon and cyanamide. This mixture, known as nitrolime, is used as:

1. a fertilizer
2. a dye
3. a paint
4. an explosive

Q.

Potassium is kept in

1. Alcohol

2. Water

3. Kerosene

4. Liquid ammonia

Q. $LiN{O}_3$ on heating gives

1. NO
2. 
3. 
4. and

Q.

H2SO2O7[i]+h2o(1)gives h2so4(1) balance the equation step wise

Q. Sodium borate on reaction with conc. $H_2{SO}_4$ and $C_2{H}_{5}OH$ gives a compound $A$, which burns with a green edged flame. The compound $A$ is:

1. $H_2{B}_4{O}_7$
2. ${{(C}_2{H}_5)}_2{B}_4{O}_7$
3. $H_3{BO}_3$
4. ${{(C}_2{H}_{5}O)}_{3}B$

Q. The electronegativity difference between N and F is greater than N and H, yet the dipole moment of $N{H}_3$ (1.5 D) is greater than that of $N{F}_3$ (0.2 D). This is because:

1. In $N{H}_3$ as well as $N{F}_3$, the overall molecular dipole and bond dipoles are in the opposite direction
2. In $N{H}_3$, the overall molecular dipole and bond dipoles are in the opposite direction, whereas in $N{F}_3$, these are in the same direction.
3. In $N{H}_3$ as well as in $N{F}_3$ the overall molecular dipole and bond dipoles are in the same direction
4. In $N{H}_3$, the overall molecular dipole and bond dipoles are in the same direction, whereas in $N{F}_3$ these are in the opposite direction