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What are the molecular formulae of the following compounds?

(Hydrochloric acid, Sulphuric acid, Sodium chloride, Glucose, Methane)

How are the following conversions brought about? Give equations and conditions:

(i) Sulphur trioxide to sulphuric acid.

(ii) Sulphur trioxide to oleum.

(iii) Dilute sulphuric acid to hydrogen.

(iv) Aqueous barium chloride to barium sulphate.

(v) Aqueous lead nitrate to lead sulphate.

(vi) Sodium chloride to hydrogen chloride.

(vii) Sucrose to sugar charcoal.

(viii) Oxalic acid to carbon monoxide.

Sodium chloride reacts with silver nitrate to produce silver chloride and sodium nitrate

(a) Write the equation.

(b) Check whether it is balanced, if not balance it.

(c) Find the weights of reactants and products.

(d) State the law that this equation satisfies.

Given below are the elements with their atomic masses. Identify a set of elements which is not a Dobereiner's triad.

Name:

1. Three elements having a single electron in their outermost shell.

2. Three elements with filled outermost shell.

3. Three elements having 7 electrons in their outermost shell.

What do you understand by the term "mole"? How many elementary units are in one mole of a substance?

Explain the chemical process which is used for obtaining a metal from its oxide?

To which group and period does the element with electronic configuration 2,8,4 belong in the modern periodic table?



[1 mark]

What happens chemically when quicklime is added to water filled in a bucket ?

Carbon dioxide gas evolves when HCl acid is added to:

Salt having pH of its aqueous solution greater than 7, is:

Solubility of a salt $A_3{B}_4$ formula is ‘s’, its solubility product is

Fill in the blank with a verb in the correct tense.

Mohan ______ his car, coats it with a special chemical and buffs it till it shines.

Which of the following is a hypohalous acid?

The charge on the electron and proton is reduced to half. Let the present value of the Rydberg constant be $R$. What will be the new value of the Rydberg constant?

Which of the following represent the correct expressions to calculate reduction potential of the following half cells at $25{}^{o}C$.

$C{l}^{-}\left(aq\right)|C{l}_2(g,1atm)|Pt\left(s\right)$

How many covalent bonds are present in the following compounds?

(i) $C{O}_2$

(ii) $H_{2}O$

(iii) $C{H}_4$

(iv) $N_2$

(v) $N{H}_3$

Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?

(A) Oxides (B) Chlorides (C) Hydrides (D) Sulphites

In plants amino acids are synthesised by

Question 15

Complete the table:

When calcium carbide reacts with water, a colourless gas X with ether-like odour is formed. What is X?

Out of Li, Na, K and Mg the most reactive metal is:

(i) What is aqua-regia?

(ii) State the use of aqua-regia.

(iii) What is the function of HCl in preparation of aqua-regia?

An alkaline gas A gives dense white fumes with hydrogen chloride. What is A?

For $HCl$ solution, at $25{}^{\circ }\text{C}$ the equivalent conductivity at infinte dilution is $425{\Omega }^{-1}{\text{cm}}^{-1}$. The specific conductance of a solution of $HCl$ is $3.825{\Omega }^{-1}{\text{cm}}^{-1}$. If the apparent degree of dissosiation is $90\%$. The normality of solution is: