Recent questions tagged class 9

Which of these is a proton donor?

asked Sep 6, 2017 by meena.p

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Which of these is a property of ice that allows fish to survive in ponds when air temperatures are below $0^{\circ}$ C?

asked Sep 6, 2017 by meena.p

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A student is pouring equal amounts of water, maple syrup, and cooking oil into a glass beaker and looking at how the layers settle. Which property of the liquids is the student most likely comparing?

asked Sep 6, 2017 by meena.p

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Which of the following is a correct statement:

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We get the smell of hot food in the kitchen outside the house because of:

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What are the most common elements in the human body?

asked Sep 6, 2017 by meena.p

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Which of the following is not produced if you mix vinegar (an acid) and sodium bicarbonate (an alkali, or base) together?

asked Sep 6, 2017 by meena.p

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Which of the following has the highest pH value?

asked Sep 6, 2017 by meena.p

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How is a molecular/covalent compound formed?

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Hair contains keratin proteins which are also present in nails and wool is an example of

asked Sep 6, 2017 by meena.p

2 answers

What happens/is likely to happen if the atoms within an element have full valence shells?

asked Sep 6, 2017 by meena.p

1 answer

In a sample of ethyl ethanoate $(CH_3COOC_2H_5 )$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

asked Sep 5, 2017 by meena.p

1 answer

On industrial scale sodium metal is prepared by electrolysis of fused

asked Sep 5, 2017 by meena.p

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Which of the following will have maximum mass

asked Sep 5, 2017 by meena.p

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Which of the following is NOT an indicator of a Chemical Reaction?

asked Sep 5, 2017 by meena.p

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When NaCl is dissolved in water, negative end of water molecules is attracted towards

asked Sep 5, 2017 by meena.p

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Mass of $NaOH$ present per $dm^3$ of $0.25\;M\; NaOH$ solution is

asked Sep 5, 2017 by meena.p

1 answer

Period number of element indicates

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What is a multivalent ion?

asked Sep 5, 2017 by meena.p

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If Z represents the atomic number and A represents mass number then the number of electrons in an atom can be computed as

asked Sep 5, 2017 by meena.p

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Molarity of solution which contains $40\; g$ urea dissolved in $500cm^3$ is

asked Sep 5, 2017 by meena.p

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Energy of an electron in orbit is proportional to

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As size of atom increases down group, electro positivity

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Which of the following has highest intermolecular forces of attraction?

asked Sep 5, 2017 by meena.p

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Arun, Deepa, Uma and Priya were asked to select a plant material which would not give blue black colour with iodine solution. Who did not select the right material ?

asked Sep 5, 2017 by meena.p

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Which of the following statement is not true about colloidal solution ?

asked Sep 5, 2017 by meena.p

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Which of the following are physical changes? <br>(i) Melting of iron metal <br>(ii) Rusting of iron <br>(iii) Bending of an iron rod <br>(iv) Drawing a wire of iron metal

asked Sep 5, 2017 by meena.p

1 answer

An element X is tetravalent and another element Y is divalent . The compound formed by these two elements will be

asked Sep 5, 2017 by meena.p

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What happens/is likely to happen if the atoms within an element have full valence shells?

asked Sep 5, 2017 by meena.p

1 answer

Commercially concentrated HCl is

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As we go from top to bottom in a group shielding effect

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Pressure that vapors apply on surface of liquid at equilibrium is called

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Molecules of liquid which escape first have

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What is a polyatomic ion?

asked Sep 5, 2017 by meena.p

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Two elements X and Y have the same atomic mass but their atomic numbers are 20 and 21 respectively . X and Y are

asked Sep 5, 2017 by meena.p

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Concentration of a dilute solution

asked Sep 4, 2017 by meena.p

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In Rutherford's experiment, α particles were deflected because of

asked Sep 4, 2017 by meena.p

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Elements which have properties of metals and non-metals are

asked Sep 4, 2017 by meena.p

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As solid melts to form liquid:

asked Sep 4, 2017 by meena.p

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A student recorded the mass of dry raisins as $2.5\;g$ and the mass of raisins after soaking in water as $4 \;g$ . While performing the above experiment. The percentage of water absorbed by raisin is :

asked Sep 4, 2017 by meena.p

1 answer

Which of the following statement is not true about suspension ?

asked Sep 4, 2017 by meena.p

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Solubility is amount of solute dissolved in

asked Sep 4, 2017 by meena.p

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Mathematical expression that describes Boyle's law is

asked Sep 4, 2017 by meena.p

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Oxidation state of group IIIA metals is

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1 answer

An electrolytic cell uses electrical energy to drive

asked Sep 4, 2017 by meena.p

2 answers

On contact with oxygen, Rubidium forms

asked Sep 4, 2017 by meena.p

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When we blow air into the balloon it inflates because:

asked Sep 4, 2017 by meena.p

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Which of the following is the correct set of apparatus for fractional distillation?

asked Sep 4, 2017 by meena.p

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Cathode rays have :

asked Sep 4, 2017 by meena.p

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Which of the following is not a postulate of Dalton’s atomic theory:

asked Sep 4, 2017 by meena.p

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