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Zinc carbonate is heated. The colour of its residue on cooling is

If molecule is completely polarized, so expected value of dipole moment is 6.12D (debye), but experimental value of dipole moment is 1.03D. Calculate the percentage ionic character

Which of the following elements is a metalloid?

Which of the following piece/s of equipment is required in the manufacturing of sulphuric acid?

Which of the following does not fall under a single homologous series?

8g of a metal hydroxide on heating produces 5g of metal oxide. If the atomic mass of the metal is 7, the formula of its chloride is ?

1. 17

According to Rutherford's model, what will be the kinetic energy of an electron of mass $m_e$ at a distance r from the center of a $L{i}^{++}$ ion? (The Lithium nucleus has three protons.)

The elements A, B and C belong to groups 1, 14 and 17 respectively of the periodic table.

(a) Which two elements will form a covalent compound?

(b) Which two elements will form an ionic compound?

In the following reaction, identify the products X and Y.
$Cu+FeS{O}_4\to X+Y$

When a blue litmus paper is put in an acidic Solution, it turns red. Can the red litmus which has been formed used to indicate basicity?

In other words, can litmus paper which has changed its colour once be reused?

(a) Is ammonia more dense or less dense than air ?

(b) What property of ammonia is demonstrated by the Fountain Experiment ?

(c) Write the balanced equation for the reaction between ammonia and sulphuric acid.

Identify the reactions that includes inhibitors in the reaction mixtures.

The most volatile compound among the following is:

The correct order of the decreasing ionic radii among the following isoelectronic species is

When Iron is alloyed with a non-metal, a hard substance called as steel is formed. The substance which is used to make it hard is ___ .

In contact process why SO3 is not directly converted to H2SO4 instead there are two more steps to convert it

A liquid which has coefficient of volumetric expansion of$\gamma ,$is heated till there is a temperature change of$\Delta T.$ The density of the liquid after heating is.
$\left(\mathrm{initial}\mathrm{density}\rho \right)$

(a) How is ethanoic acid obtained from ethanol? Write down the chemical equation of the reaction involved.
(b) How would you distinguish between ethanol and ethanoic acid by a chemical test?
(c) Explain the formation of scum when hard water is treated with soap.

Which of the following represent the correct increasing order of unsaturation?

Which molecule possesses electrovalent, covalent & co-ordinate bond?

(a) Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.

(b) Balance the following chemical equation.

$Mn{O}_2$ + HCl $⟶$ $MnC{l}_2$ + $C{l}_2$ + $H_{2}O$

Write a balanced chemical equation to represent the following reaction:
Iron reacts with steam to form Iron(II,III) oxide and hydrogen gas.

Which of the following allows us to reach the lowest attainable temperature?

Lothar Meyer arranged the elements in order of increasing:

Which type of iron is used in the construction of buildings and machinery?

1. 2.41

1. 4

Maximum number of electrons in a subshell with l = 3 and n = 4 is:

Match the entries in column I with the entries in column II.
$$\begin{array}{cc}\text{Elements}& \text{Electronic configuration}\\ \text{(i)}{C}^{-4}\text{is highly unstable because}& \text{(a) It would be difficult for carbon with six protons in its nucleus to hold on just two electrons.}\\ \text{(ii)}{C}^{+4}\text{is achieved by}& \text{(b) gaining four electrons to its outermost orbit}\\ \text{(iii)}{C}^{+4}\text{is highly unstable because}& \text{(c) losing four valence electrons}\\ \text{(iv)}{C}^{-4}\text{is achieved by}& \text{(d) It is difficult for the nucleus with six protons to hold on ten electrons, i.e. four extra electrons}\end{array}$$

The IUPAC name of the given compound is

Which metal can be extracted from each one of the following ores:

(a) bauxite (b) calamine (c) haematite.

The molecular formula of benzene is:

Suppose an electron beam is used to probe the internal structure of a neutron. The required kinetic energy of the electron is (assume the diameter of a neutron to be of the order of ${10}^{-15}m$) of the order of

Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the proper composition of Aqua-regia from the given options?

The IUPAC name of this compound is?

1. 2

(a) Write the chemical equation of the reaction which takes place during the burning of ethanol in air.
(b) Why is ethanol used as a fuel?
(c) State two uses of ethanol (other than as a fuel).

Carbon compounds have usually .......... melting points and boiling points because they are .......... in nature.