Chemical Reactivity

Q.

Why Fluorine is more reactive than Chlorine?

Q. Why every atom wants to become stable?

Q. The metals that float when treated with water are_____________

1. Magnesium and Calcium
2. Magnesium and Sodium
3. Manganese and Sodium
4. Sodium and Calcium

Q.

If noble gases are neither electropositive nor electronegative in nature, why they are considered as non metals?

Q. The metals that float when treated with water are_____________

1. Sodium and Calcium
2. Magnesium and Calcium
3. Magnesium and Sodium
4. Manganese and Sodium

Q. 10. Among the following elements group number is not equals to valence electrons: a) Na B) N C) Ne D) None

Q. Why does Xenon forms compounds like XeF2? Though it is having octet completed

Q.

The noble gases are unreactive because ___ .

1. they have a large number of neutrons.

2. they have a large number of protons.

3. their valence shell is completely filled with electrons.

4. their valence shell is half filled with electrons.

Q.

The process of coating of iron with zinc.

Q.

Assertion: Group 18 elements do not combine with any other elements.
Reason: All the elements of group 18 have a stable configuration.

1. The assertion is true but the reason is false.

2. Both assertion and reason are true and the reason is the correct explanation of the assertion.

3. Both assertion and reason are true but the reason is not the correct explanation of the assertion.

4. Both assertion and reason are false.

Q.

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

1. Both assertion and reason are true and the reason is the correct explanation for the assertion.

2. Both assertion and reason are true but the reason is not the correct explanation for the assertion.

3. The assertion is true but the reason is false.

4. The assertion is false but the reason is true.

Q.

In the formation of $Al{F}_3$, Aluminium atom has to lose ______ electrons.

1. $1$

2. $2$

3. $3$

4. $4$

Q. The chemical elements(P, Si , Se , Br , N) are arranged in the order ofincreasing electronegativities in the sequenceand how

Q. How to name elements more than the atomic number 100

Q.

Q. What happens when a piece of zinc metal is added to a copper sulphate solution?
Write the balanced chemical equation for the reaction.

Q. Answer the following in respect of element ${16}^{S^{32}}.$
(vi) Give its formula with chlorine.

Q. What happens on heating anhydrous copper sulphate

Q. An alloy is a homogeneous mixture.

1. True
2. False

Q.

The elements M, N, 0, P, and Q have atomic numbers 9, 11, 17, 12, and 13 respectively. Identify the pair of elements that belong to the same group.

1. P and Q

2. M and 0

3. N and P

4. M and N

Q. What is the number of filled shells in an atom of calcium?​

1. Four
2. Two
3. Five
4. Three

Q.

Four elements A, B, C, and D have the following electronic configuration:​
A: 2, 6​
B: 2, 8​
C: 2, 8, 8, 1​

i. Which element is an inert gas?​
ii. What type of bond is formed when element C combines with element A?​
iii. What will be the formula of the compound formed between A and C?​

Q. A metallic oxide $A$ is strongly acidic and forms violet vapors on warming and explodes violently at 230K giving out oxygen and a weak acidic oxide. The compound $A$ on dissolution in water gives characteristic purple color, then compound $A$ is:

1. White coloured.
2. at its highest oxidation.
3. having amphoteric nature.
4. capable of giving some disproportionation reaction.

Q. Electron affinity is positive, when

Q.

Which of the following is a purple coloured solid halogen?

1. Bromine

2. Iodine

3. Astatine

4. Chlorine

Q. Identify the metals that react violently with water.

1. Lithium
2. Helium
3. Xenon
4. Sodium
5. Potassium
6. Caesium
7. Rubidium
8. Argon

Q. Which of the following pairs have dissimilar chemical properties?

1. Sodium ($\text{Na}$) and potassium ($\text{K}$)
2. Barium ($\text{Ba}$) and strontium ($\text{Sr}$)
3. Zirconium ($\text{Zr}$) and hafnium ($\text{Hf}$)
4. Calcium ($\text{Ca}$) and copper($\text{Cu}$)

Q. All the elements in a group have:

1. same number of shells
2. same mass number
3. same number of isotopes
4. same number of valence electrons