Chemical Reactivity

Q.

What is the most reactive nonmetal in the periodic table?

Q.

Equimolar solutions in the same solvent have

1. Same freezing point but the different boiling point

2. Same boiling point but different freezing point

3. Different boiling and different freezing point

4. Same boiling and same freezing points

Q.

Identify the type of reaction taking place and write a balanced chemical reaction for Zinc reacts with silver nitrate to produce zinc nitrate and silver.

Q.

Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is:
(a) F > Cl > O > N
(b) F > O > Cl > N
(c) Cl > F > O > N
(d) O > F > N > Cl

Q.

Why Is fluorine the most reactive halogen?

Q.

The increasing order of reactivity among group 1 elements is Li < Na < K < Rb CI > Br > I. Explain.

Q. The relative abundance of two rubidium isotopes of atomic weight 85 and 87 are 75% and 25% respectively. The average atomic weight of rubidium is ?
a)75.5 b)85.5
c)87.5 d)86.5

Q. The weight of 350 ml of a diatomic gas at 0^°c and 2 atm pressure is 1g. The weight of one atom is :

Q.

1)carbon has, 3 isotopes of atomic mass unit 12. 0 u and 13. 0 u and 14 u the relative abundance of these three isotopes are 98. 8 9 and 1. 10 and 2x10-10 respectively find out the average atomic mass of carbon?

Q. The statement that is incorrect about Ellingham diagram is:

1. provides idea about the reaction rate.
2. provides idea about free energy change.
3. provides idea about changes in the phases during the reaction
4. provides idea about reduction of metal oxide

Q. Why cesium is more electron positive than francium?

Q.

Name the alloy between zinc and copper.

Q. The electronic configuration of four elements L, P, Q and R are given in brackets $(1s^2,2s^{2}2p^4);Q(1s^2,2s^{2}2p^6,3s^{2}3p^5),p(1s^2,2s^{2}2p^6,3s^1);R(1s^{2}2s^{6}2p^6,3s^2)$. The formulae of ionic compounds that can be formed between these elements are

1. 
2. 
3. 
4. 

Q. In this reaction, if we double the concentration of A, reaction rate become two times. And in other experiment, we double the concentration of A and B, reaction rate again become two times. What is the order of this2A BC+Dreaction?(1)

Q.

What is another name for Group 2 elements?

Q.

In period 3 of periodic table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the brackets to complete the following statements

1. The element B would have (lower/ higher) metallic character than A
2. The element A would probably have (lesser/ higher) electron affinity than B
3. The element A would have (greater/ smaller) atomic size than B

Q.

Name the metals present in bronze. What are the uses of this alloy?

Q.

Which of the following represents alkali metals (i.e. 1 group metals) based on $(IE{)}_1$ and $(IE{)}_2$ values?

1. Y = 95; 120

2. X = 100; 110

3. Z = 195; 500

4. M = 200; 250

Q.

How to easily remember periodic table

Q. which of the following elements has maximum density of nucleus> n nt1. K (19, 39) n nt2. Al (13, 27) n nt3. He (2, 4) n nt4. ALL

Q. Explain the following :
(a) Group 17 elements are strong non-metals, while group 1 elements are strong metals.

Q. Find the coordination number and oxidation number of X in the given compound.

Q.

The most basic element is

1. Bromine

2. Chlorine

3. Iodine

4. Fluorine

Q.

1 A certain mass of a gas occupies volume 2 litre at STP keeping the pressure constant at what temperature would the gas occupies volume 4L

2 one litre of unknown gas weighs 1.25 gram at ntp which of the following gas pretend to be the above data

Q.

The p-block elements constitute elements belonging to which groups?

Q. The magnitude of standard Gibbs free energy for the given cell reaction in $KJmo{l}^{-1}at298K$ is
$Zn\left(s\right)+C{u}^{2+}\left(aq\right)\to Z{n}^{2+}\left(aq\right)+Cu\left(s\right),E^{\circ }=2Vat298K$ $(Farada{y}^{\prime }sconstant,F=96000Cmo{l}^{-1})$

Q. Which of the following order is correct of reducing strength in water-

1. $Cs>Rb>K>Na>Li$
2. None of these
3. $Li>Na>K>Rb>Cs$
4. $Li>Cs>Rb>K>Na$

Q.

The metal always found in free state is

1. Copper

2. Gold

3. Silver

4. Sodium

Q.

A gaseous mixture containing 0.35 g of N2 and 5600ml of O2 at STP is kept in a 5litre flask at 300K. The total pressure of the gaseous mixture is?

Q. When water is dropped over sodium peroxide, the colourless gas produced is

1. Dinitrogen
2. Dihydrogen
3. Dioxygen
4. Hydrogen peroxide