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By Wurtz reaction, a mixture of ethyl iodide and methyl iodide gives:

Identify the group(s) of animals that come(s) under the category of consumers.

Give reason as to why-hydrogen chloride can be termed as a polar covalent compound.

The author’s experience at Hor was in stark contrast to earlier accounts of the place.

What volume of 1.10 M sodium formate solution should be to 50 mL of 0.05 M formic acid to produce a buffer solution of pH 4.0? (pK_a for formic acid is 3.80).

(a) What are the periods and groups in a periodic table? Give two characteristics of each.

(b) In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group.

(c) Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr :

$\begin{array}{cc}Li& Be\\ Na& \\ K& \\ Rb& \\ Cs& \\ Fr& Ra\end{array}$

(i) What happens to the size of atoms?

(ii) What happens to their metallic character?

(d) Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?

(e) Rewrite the following statement after correction, if necessary :

Groups have elements with consecutive atomic numbers.

An organic compound A having the molecular formula $C_3{H}_{8}O$ is a liquid at room temperature. The organic liquid A reacts with sodium metal to evolve a gas which burns causing a little explosion. When the organic liquid A is heated with concentrated sulphuric acid at ${170}^{o}C$, it forms a compound B which decolourises bromine water. The compound B adds on one molecule of hydrogen in the present of Ni as catalyst to form compound C which gives substitution reactions with chlorine.

(a) What is compound A ?

(b) What is compound B ?

(c) What type of reaction occurs when A is converted into B ?

(d) What is compound C ?

(e) What type of reaction takes place when B is converted into C ?

The electrons present in the valence shell of a noble gas atom can be:

(a) 8 Only

(b) 2 Only

(c) 8 or 2

(d) 8 or 4

Which of the following pairs are correct?

In Kjeldahl's method the amount of ammonia produced is determined by estimating the amount of:

Define the following terms:

1. Metallurgy

2. Minerals

3. Ores

Which statement is correct about the following reaction?
ZnO + CO → Zn + $C{O}_2$

Explain why iso pentane is named as methlybutane

The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do a, b and c represent respectively?

Which of the following is an example of man-made ecosystem?

State whether the following statements are true or false :

(a) In biology, human beings are called producers.

(b) Secondary consumers and tertiary consumers, both are carnivores.

Application for 5,00,000 shares were received. It was decided

(a) To refuse allotment to the applicants for 20,000 shares;

(b) To allot in full to applicants for 80,000 shares;

(c) To allot the balance of the available shares pro-rata among the other applicants; and

(d) To utilize excess application money in part as payment of allotment money.

One applicant, whom shares had been allotted on pro-rata basis, did not pay the amount due on allotment and on the call, and his 400 shares were forfeited. The shares were reissued Rs.9 per share. Show the journal and prepare cash book to record the above.

On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate, however, dissolves on the addition of an excess of ammonia solution. Identity (choose from Na, Al, Zn, Pb, Fe)
(a) Which metal salt solution was used?
(b) What is the formula of the white gelatinous precipitate obtained?

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.

What mass of calcium chloride is formed? [Relative molecular mass of calcium chloride is 111].

To protect objects from corrosion, which of the following process can be done

In an experiment to study the properties of acetic acid a student takes about 2 mL of acetic acid in a dry test tube. He adds about 2 mL of water to it and shakes the test tube well. He is likely to observe that:

Which of the following is true for calcination of a metal ore?

Number of chain isomers of $C_6{H}_{14}$ is:

What is meant by rusting of iron? With the help of labelled diagrams, describe an activity to find out the conditions under which iron rusts.

Borax bead test is responded by: