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Question 44
What would happen if green plants disappear from the earth?

43. A closed flask contains a substance in all its three States , solid, liquid, and vapour at its triple point . in this situation the average KE of the water molecule will be

Electric current is passed through an aqueous solution of lithium bromide. What is the product at the cathode and anode respectively?

What is a base? Give an example.

Which of the following statements is/are correct for 80 g of oxygen?

A temperature of ___ is maintained in the rate determining step of the reaction.

Turmeric, clove and rose petals are __ indicators.

If the ratio of weights of oxygen in two oxides of an element that combines with a fixed weight of the element is 1:2 , then the ratio of weight of the element that combines with a fixed weight of oxygen is [a] 1:2 [b] 2:1 [c] 4:1 [d] 1:4

The combining capacity of an element is known as its ______________.

From the following information, calculate capital at the beginning.

$\begin{array}{cc}\text{Items}& \text{Amt(Rs)}\\ \text{Capital at the End of the Year}& 4,00,000\\ \text{Drawings Made During the Year}& 60,000\\ \text{Fresh Capital Introduced During the Year}& 1,00,000\\ \text{Profit of the Current Year}& 80,000\end{array}$

The freon(s) among the following is/are:

Classify iron on the basis of their carbon content present in them?

Which one of the following is an acidic oxide?

Separate the following into substances having pH values above and below 7. How do these influence litmus paper?

(i) Lemon juice

(ii) The solution of washing soda

(iii) Toothpaste

(iv) Vinegar

(v) Stomach juices

Match the functional groups with their general notation.

Name two metals which are used:
(a) for making electric wires.
(b) for making domestic utensils and factory equipment.
(c) for making jewellery and to decrate sweets.

The characteristic reaction of alkanes is

Sasha heats a container carrying nitrogen and oxygen. After heating at a very high temperature, it gives nitric oxide. Identify the mixtures and/or compounds before and after the reaction.

A substance which gives a brick red flame and breaks down on heating giving oxygen and brown gas is:

Which of the following is a non-metal that conducts electricity?

Name the following:

(i) Acid present in the stomach of mammals.

(ii) Drying agent used to dry hydrogen chloride.

(iii) Salt obtained by heating sodium chloride with concentrated sulphuric acid below 200 degree celsius.

(iv) Gas that yields dense white fumes when mixed with hydrogen chloride.

(v) Two solution that yield white precipitates, when treated with hydrogen chloride or hydrochloric acid.

(vi) Gas obtained by treating metals with hydrochloric acid.

(vii) Gas obtained by treating ferrous sulphide with hydrochloric acid.

(viii) Five oxidizing agents that liberate chlorine from concentrated hydrochloric acid.

(ix) Acid used to extract glue from bones.

(x) A chloride which is soluble in excess of ammonium hydroxide.

(xi) A greenish yellow gas.

(xii) A chemical in which gold can be dissolved.

(xiii) A metallic oxide which reacts with hydrochloric acid to give a coloured solution.

(xiv) Two colourless gases which when mixed produce a white solid.

Name the gas obtained when hydrogen and nitrogen are combined.

Question 8



Which among the following statement(s) is (are) true?



Exposure of silver chloride to sunlight for a long duration turns grey due to:

(i) the formation of silver by decomposition of silver chloride.

(ii) sublimation of silver chloride.

(iii) decomposition of chlorine gas from silver chloride.

(iv) oxidation of silver chloride.



(a) (i) only

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iv) only

The number of functional isomers of pent-1-yne is?