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What is biodegradable and non biodegrdable wastes? Give example for each. [3 MARKS]

Name of the functional homologous group is derived from two specific words, carbonyl and hydroxyl. Identify it.

Why is there a need to write down the state of a compound in a chemical reaction?

Why reaction of sodium with dilute HCl highly explosive?

State the position of aluminium in the Periodic Table.

Mrs. Anu started a firm with a capital Rs. 4,00,000 on 1st July, 2016. She borrowed from her friends a sum Rs. 1,00,000 $10\%$ per annum (interest paid) for business and brought a further amount to capital Rs. 75,000 on 31st December, 2016.
Her position was:

$\begin{array}{cc}\text{Items}& \text{Amt. (Rs.)}\\ \text{Cash}& 30,000\\ \text{Stock}& 4,70,000\\ \text{Debtors}& 3,50,000\\ \text{Creditors}& 3,00,000\end{array}$

She withdraw Rs. 8,000 per month for the year. Calculate profit or loss for the year and show your working clearly.

What are the similarities in properties of elements in halogen family ?

On 1st January, 2013 A Ltd, company purchased machinery for Rs. 20,00,000. Depreciation is provided at15% per annum on diminishing balance method. On 1st March, 2015 $\frac{1}{4}$ of machinery was damaged by fire and Rs. 40,000 machinery were received from the insurance company in full settlement. On 1st September, 2015 another machinery was purchased by the company for Rs.15,00,000. Write up the machinery account from 2015 to 2016. Books are closed on 31st December, every year.

'x' moles of $N_2$ gas at S.T.P conditions occupy a volume of 10 litres, then the volume of '2x' moles of $C{H}_4$ at ${273}^{0}C$ and 1.5 atm is

(a) Name the reaction which is usually used in the conversion of vegetable oils to facts. Explain the reaction involved in detail. Write a chemical equation to illustrate your answer.
(b) What is saponification? Write the chemical equation of the reaction involved in this process. Name all the substances which take part in this process and also those which are formed.
(c) Why does micelle formation take place when soap is added to water ? Will a micelle be formed in other solvents like ethanol also?

Name one electrovalent compound. In which one atom combines with three other atoms

It takes 26 s for 10 mL of $H_2$ to effuse through a porous membrane. It takes 130 s for 10 mL of an unknown gas to effuse. Hence, molecular weight of the unknown gas is (in $gmo{l}^{-1}$ )

Why the usage of following products should be minimized?

Why should curd and other sour foodstuffs (like lemon juice, etc.) not be kept in metal containers (such as copper and brass vessels)?

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen excapes in the time required for one-half of the hydrogen to escape?

The functional group of alcohol is:

The correct value of Avogadro’s number is :

Distinguish between:

(a) a common acid-base indicator and a universal indicator,

(b) the acidity of bases and basicity of acids,

(c) acid and alkali (other than indicators).

Calamine is an ore of

Complete the following reaction: $N{a}_{2}C{O}_3+H_{2}S{O}_4\to$ ____?

Which of the following compounds of boron does not exist in the free form

Which non metal has a shining surface?

(a) Giving one example each, state what is (i) ionic compounds, and (ii) covalent compounds.
(b) Compare the properties of ionic compounds and covalent compounds.

A scientist noted the solubility of methane gas in water at 25⁰ C at various pressures. But he entered the wrong pressure values corresponding to the solubility values.

$$\begin{array}{cc}Solubilityofoxygengasinwater\left(mg/L\right)& Pressureexertedonoxygengas\left(inPascal\right)\\ 3& 0.015\\ 5& 0.006\\ 9& 0.003\end{array}$$

Based on your knowledge about variation of solubility with pressure, help him correct the observation table.

Give three reasons for the existence of a large number of carbon compounds?

Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas ?

Name the element which is in :

(a) the first group and third period. (b) seventeenth group and second period.

What volume of 0.10 M $H_{2}S{O}_4$ must be added to 50 ml of a 0.10 M $NaOH$ solution to make a solution in which the molarity of the $H_{2}S{O}_4$ is 0.050 M?

Which among the following hydrocarbon is an alkene?

Amount of water produced by the combustion of 16g of methane is:

A metal M forms a volatile chloride contaning 65.5 % chlorine. If the density of the chloride relative to hydrogen is 162.5, find the molecular formula fo the chloride (M- 56).

Which of the following reacts vigorously with cold water?

The correct order for the increasing order of oxidizing power is

The alloy of which of the following metals, is usually used for making bells?

The chemical formula of formic acid is

Pure gold is equal to

Which is the only liquid non metal

Complete the following equation:
${\mathrm{FeSO}}_4.7H_{2}O\left(s\right)\stackrel{\Delta }{\to }\mathrm{FeO}(\mathrm{s)}+$+$7H_{2}O\left(g\right)$