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In the following metals which one has lowest probable interatomic forces

Use of heat for generating metallurgical changes in compounds is called ___ .

A hydrocarbon of formula $C_6{H}_{10}$ absorbs only one molecule of H2 upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yields

The hydrocarbon is

The IUPAC name of the below compound is?

Corrosion is a type of ___reaction.

Define:

roasting (1m)

calcination (1m)

Any chemical element (X) can be represented as ${}_Z{X}^A$ where ‘Z’ is an atomic number and ‘A’ is the mass number. For an element, calcium which has 20 protons and 20 neutrons, identify the correct representation.

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(c) How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

What do the following symbols stand for ?

(a) H (b) H${}_2$ (c) 2H.

What are inert gases? Why are they called so? Also write their general configuration.

The most impure and pure forms of iron respectively are:

Why hasn't the iron pillar of Delhi corroded when it is made of metal

500 my aqueous solution is prepared by dissolving 2 moles of hcl in water. What will be the molarity of this solution.

Question 43 (a)
A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.

Where in the periodic table are elements X and Y placed?

Which of the following statement is correct regarding an electrolyte?

Match the following:
$\begin{array}{cc}\text{a) Litmus}& \text{1) Blue in acidic, pink in basic soils}\\ \text{b) Methyl orange}& \text{2) Red in acidic, yellow in basic solutions}\\ \text{c) Phenolphthalein}& \text{3) Blue in basic, red in acidic solutions}\\ \text{d) Color of Hydrangea}& \text{4) Pink in basic, colorless in acidic solutions}\end{array}$

What is the significance of a food chain. Give 3 reasons.

Which of the following element has the largest atomic size?

Which of the following statement(s) is/are true about a freely falling body?

1. Total energy is constant.

2. Potential energy changes to kinetic energy.

3. Potential energy decreases.

4. Kinetic energy increases.

Iron displaces copper from its salt solution because:

X is an intermediate between suspension and solution and is also a homogeneous looking like heterogeneous mixture in which particles have size between 1nm to 100nm. Name X.

Consider the following reaction:

$N_2\left(g\right)+3H_2\left(g\right)\leftrightharpoons 2N{H}_3\left(g\right)$

What will happen if the temperature of the reacting system is decreased?

Why is water not added to concentrated $H_{2}S{O}_4$ in order to dilute it ?

Metal oxides which react with both, acids as well as bases, to produce salt and water are known as ___.

Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting (b) hydrogenation (c) chlorination (d) calcination

1. 3

Which colour precipitate is obtained when the silver nitrate solution is added to dilute hydrochloric acid?

Number of $\alpha$-hydrogens in

$C{H}_3-\stackrel{\underset{||}{O}}{C}-C{H}_2-C{H}_2-C{H}_3$ is?

Amalgam is a homogeneous mixture of a____________.

An element X from group 2 reacts with element Y from group 16 of the periodic table.

(a) What is the formula of the compound formed?

(b) What is the nature of bond in the compound formed?

Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain :

(a) Sodium sulphate, (b) Copper sulphate,

(c) Iron (II) sulphate, (d) Zinc carbonate,

$\begin{array}{ccc}\text{Dilute sulphric acid}& Copper& Coppercarbonate\\ & \text{Iron}& SodiumCarbonate\\ & \text{Sodium}& \\ & \text{Zinc}& \end{array}$

Question 3
Which of the following are environment-friendly practices?
1. Carrying cloth-bags to put purchases in while shopping
2. Switching off unnecessary lights and fans
3. Walking to school instead of getting your mother to drop you on her scooter
4. All of the above

Column 1: Compound Column

Column 2: Oxidation state Column

Column 3: Type of linkage

$\begin{array}{cccccc}& \text{Column 1}& & \text{Column 2}& & \text{Column 3}\\ \left(I\right)& N{a}_2{S}_2{O}_3& \left(i\right)& +5& \left(P\right)& S-O-S\\ \left(II\right)& N{a}_2{S}_4{O}_6& \left(ii\right)& -2& \left(Q\right)& -S-S-\\ \left(III\right)& H_2{S}_2{O}_7& \left(iii\right)& +6& \left(R\right)& -O-O-\\ \left(I\right)& H_2{S}_2{O}_8& \left(iv\right)& +4& \left(S\right)& S=S\end{array}$

The only correct combination in which the hybridization of one of the S atom is $s{p}^2$:

Why do you think is the man painting his shed?

Arrange the following elements in the order of their abundance in Earth's crust:

Aluminium - $Al$, Silicon - $Si$, Oxygen - $O$, Iron - $Fe$.

The modern periodic table was given by:

What is washing soda? State two properties and two uses of washing soda

Which of the following will undergo addition reactions?

How many bonds are present in $H_2$ molecule?

One of the following contains a double bond as well as single bonds. This is:
(a) $C{O}_2$

(b) Methane

(c) Ethene

(d) Nitrogen

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is: